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 Write-Up: Installing Rancho F-250 shocks on the Riviera

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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyFri Jan 19, 2007 4:25 pm

Write up: https://rivperformance.editboard.com/brakes-suspension-f6/write-up-installing-rancho-f-250-shocks-on-the-riviera-t1030.htm#10848

This sounds like something I want to do. But, I was curious of the ones that converted...are you happy with the conversion and did you notice a change in handling and ride? I also plan on doing the STB and sway bar upgrades this spring.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptySat Apr 07, 2007 11:41 pm

Well maybe I shoulda answered this sooner . . .

Everyone told me it was a huge improvement and they were right. If you've got the tools, go for it. You won't be disappointed in the shocks but you will probably want better tires afterwards and more HP.

I've been riding with mine set to "3" and it is stiffer than stock, maybe slightly more than I'd want in a Riv, but completely liveable.

I don't plan to swap them off.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyFri Jun 15, 2007 7:32 pm

Installing Rancho RS-99251 F-250 shocks on the Buick Riviera (version 2.0)

(thanks to Camlifter for this mod)

Write-Up: Installing Rancho F-250 shocks on the Riviera 011qab

Rancho F-250 shocks are a great mod for improving the handling of the Riviera while getting rid of the air ride, which can be an expensive repair. Ride height is unaffected, and the ride remains smooth.

Changing stock shocks on the Riv is super easy - the F-250 mod is more involved. Challenges include transferring the cross pins from the old Riv air shocks to the new Rancho shocks, and modding/replacing the shock mounts.

The mod should take between 6-10 hours, depending on your fabrication skills. If you've got the time and the extra $$, here's how to do it.

Tools -

millimeter and English socket sets

vise

big grinding wheel (optional)

dremel with various grinding wheels

pocket knife

penetrating oil (wd-40 or the like)

heavy gloves

safety glasses

breathing mask


Parts Needed:

Pair Rancho RS-99251 shocks

Pair S.A.E. nuts to fit the Rancho shocks (the nuts on the Riv's air shocks are metric and will not work!)

Pair 95 Riviera shock mounts

The Process

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First, a comparison of the 95 (and 96?) and 97 (and up?) shock mounts.

(note that I've begun modifying the top of the bushing pin and the rubber projections on the 95)

GM made several changes between the 95 and 97 model year shock mounts. Most notable for the purpose of this mod is the lengthening of the bushing pin. The bottom of the 95 pin is shorter, and the overall length of the 95 pin is shorter. The inner and outer diameter of the 95 pin is smaller than the 97 pin. These factors make the 95 shock mount more desirable for the F-250 shock mod, as the bushing pin must be modified. The threaded portion at the top of the Rancho shock is shorter than the threaded portion of the stock air shock, and the shock mount has to be modified to accomodate it. To modify a 97 pin would mean grinding through more material on the top of the pin, and grinding the pin on the bottom as well. IMO modifying the bottom of the 97 pin can not be done with hand tools. Because the bottom of the pin is a contact surface (the top is not), it's my opinion that it has to have the same perfect machined surface as stock, or a failure in the shock or the pin could be induced. Do yourself a favor and don't even consider modifying a 97-up shock mount unless you're a machinist or can have one do it for you.

Modding the Shock Mounts

This is going to take time, and a little trial and error. Don't rush it and take too much material off at a time.

It's necessary to grind down both the rubber projections on the top of the shock mount, and the bushing pin.

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Put on your safety equipment, and work with good ventilation.

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I used a wide grinding wheel on the rubber projections and the bushing pin, and a narrow one to cut down the parts between the rubber projections. You might want to have two of the wide grinding wheels on hand. When I was done, my grinding wheel was rounded off like this:

Write-Up: Installing Rancho F-250 shocks on the Riviera 015ozh

It doesn't do such a good job in this condition : )

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Start with the rubber projections. Grind them down so there's a slope pointing towards the top of the bushing pin (grind on left, unmolested mount on right). By going across the projection instead of along it, a great deal of control can be achieved.

Write-Up: Installing Rancho F-250 shocks on the Riviera 017wli

Grind down the top of the bushing 1/8" by first beveling the inside, and then grinding down the rim. You will have to repeat this process, grinding down the rubber projections, and then the bushing, 1-2 more times.

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Write-Up: Installing Rancho F-250 shocks on the Riviera 019ph

Pop a washer onto the top of your modded mount and use a dowel or whatever's handy to mark your progress. Shoot for a height of 2 3/16" - 2 1/4". At 2 1/8" I took a little more off mine than was necessary - you might as well leave on all the rubber you can to absorb the shock rebound.

Note that I'm pressing my dowel all the way down to the bottom of the shock, not the bottom of the dowel pin.

Finally, shoot for an 1/8" clearance between the washer and the top of the bushing pin when grinding the bushing pin down.


Removing the Old Shocks

When you're done modding the shock mounts, it's time to remove the old shocks.

While your Riv's on the ground, pop the trunk and loosen the carpet around the top of the shocks. You need to remove one of the ties for the cargo net, on each side, and two plastic rivets.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0110zi


Pull the carpet over, here's the top of the shock -

Write-Up: Installing Rancho F-250 shocks on the Riviera 0111b


Go ahead and take that nut off.

Break out your jack and remove the rear wheel.

First, unclip and remove the air line.

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Push it back into the fender and it will be stored neatly away. In case you ever want to use the air ride system again, cover the openings in the line so the tire doesn't throw debris up into it.

Now there are only two bolts to remove.

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Write-Up: Installing Rancho F-250 shocks on the Riviera 0114h


Nothing to it. Squirt some penetrating oil on them, and unbolt the bolts. Grab the clips that slide off the cross pin, you'll need to put them on the Rancho later.

Rotate the shock 90 degrees, and lower it downward through the slot in the A-arm. It may be stuck at the top, tug it free. When the top's clear, pull the shock up and out of the fenderwell.

Swapping Shock Mounts

Sit the old air shock aside - you'll need it again later. If you've got a 97-up car, grab the washer that came off the top of the shock. It's different from the 95 washer, and supposedly better (it appears to form a sound chamber with the rubber wall around the bottom of the shock mount, surrounding the shock/shock mount bushing interface).

Write-Up: Installing Rancho F-250 shocks on the Riviera 0115e

The shock mounts are easy to replace. They're held on with two nuts. Remove the two nuts and the metal plate and set them aside. The old mount drops free. Install the modded mount. Don't forget to put the metal plate back on.

You need to do a little test fitting with the Rancho shock now to make sure you've cut down the modded mount enough. Don't worry that the wrong cross pin is still in the Rancho, you aren't going to mount it at the bottom yet. Pull on the round plate at the top of the shock (the Rancho ships in a retracted configuration) and a chrome rod will extend. Stick a washer on the top of the Rancho and push the threaded part up into the shock mount. Try to put a washer and nut on at the top. The Rancho threads are not metric like the stock air shock threads. You can not reuse the nut from the Riv shock!

Write-Up: Installing Rancho F-250 shocks on the Riviera 0116nu

This is what you're shooting for - both washers on, and the nut fully on the threads. Again, I took a little too much material off and ended up with a couple threads sticking out at the top. Try to do better than I did, and leave a little more material on.

It would be wise to take a metal brush and clean the paint off the Rancho's threads before installing. Otherwise the nut is likely to stick and start turning the chrome rod inside the shock, and you'll have to pull out a pair of vise grips and tighten the top nut up this way:

Write-Up: Installing Rancho F-250 shocks on the Riviera 0117m

When you're satisfied that your new shocks will install in the modded mounts properly, set them aside. We're going to work with the old air shocks next.

Modify the Air Shock Cross Pin

The next step is to grind down one side of the air shock cross pin, for easy insertion into the red rubber of the Rancho shock later.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0118xr

Here's the problem - those square corners need to be rounded off (one side only) before you can put this into the Rancho.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0119ea

Here's what I used to round the corners off.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0120f

When I was done with the big grinder, I used a little grinder on a dremel to smooth the edge burs left by the big grinder down.

Removing the Air Shock Cross Pin

Get ready for the most (or second most) fun part of the entire mod - pulling the cross pin and prepping it for the Rancho. The sticky black rubber Buick used is a heck of a material. You'll be cutting it with a pocket knife, but be warned - it doesn't cut easy. It's better to go slow with the blade and "worry" at it then to try for one quick smooth forceful stroke. This stuff absorbs impact energy very, very well, but a continuous pressure will get it.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0121lq

Cut the rubber flush on one side of the shock.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0122zk

Stick the cross pin in your vise. Note that I have it clamped in sideways - if you do it the other way, it will bend. That will both keep you from getting the cross pin out, and maybe-possibly damage the pin. I'm not an expert on metal fatigue, but seeing an important part like this bend scares me.

When you've got the pin clamped in, lever the shock around until you get the pin and it's accompanying plug of rubber out of the eyehole.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0123up

Almost there. You've got to shave that rubber plug off the cross pin. It's thoroughly and completely glued on to the pin - you can't pull the pin out, you have to cut the rubber off in chunks.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0124qb

It'd be a good idea to leave a 1/16" thickness of rubber on the cross pin, as it is slightly loose in the Rancho otherwise.

Removing the Rancho Cross Pin

Onto the last "fun" part of the mod - again, removing a crosspin. This time it's the relatively easy crosspin of the Rancho's, so break one out.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0125fz

Here's what you need to remove.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0126j

Here's how to do it. There's three steps. First, stick a deep socket on one end, and then pop the shock into your vise. Use the vise to press one side of the cross pin flush with the eye socket of the shock (thanks to Camlifter for this technique).

Write-Up: Installing Rancho F-250 shocks on the Riviera 0127g

Second, take a socket of the same diameter as the cross pin, and use it to press the cross pin about halfway down into the eyesocket. Don't go too far or you'll have trouble getting the socket out.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0128zn

Does this look familiar? Leverage the shock free of the cross pin, and then flip it over and get the socket out, if you can't do it with your hands.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0129s

It's all downhill from here.

Preparing the Rancho for Install

Write-Up: Installing Rancho F-250 shocks on the Riviera 0130r

Stick the old cross pin in the new shock. It goes in easy enough, I did it by hand.

Next, grab the disk thing on the other end of the shock and puuuull the chrome rod part out. Measure the length of it against the old shock - open the Rancho out four inches less than that.

Slide the red rubber dust boot on. If you haven't seen one of these before, the ends are different. There's a wide opening, that's the bottom, for the body of the shock. And there's a smaller opeing, which is the top. Inspect the top opening so you can see how it fits onto the disk type structure at the top of the Rancho. There are two lips, the disk goes inbetween them, sealing in the chrome part of the shock.

Write-Up: Installing Rancho F-250 shocks on the Riviera 0131vk

There's a trick to installing the Rancho so that the dust boot doesn't a) fold up over itself and look stupid when you lower the car and b) doesn't pop off at the top when you extend it out far enough to reach into the trunk (this is why you pulled the chrome rod out 4" shorter than the air shock).

Install the dust boot so it looks like this. Put the washer you set aside from the old shock onto the top of the Rancho. Stick the Rancho in the wheel well, put the clips back on the cross pin, and bolt up the bottom. The threaded part at the top of the shock should just barely reach into your shock mount.

Check the setting - the red knob at the bottom of the shock. I have mine set with "3" in the 12 o'clock position. I've yet to learn if this actually indicates a setting of 3, but it does ride and handle well.

Remount your wheel and lower the car. The threaded part of the Rancho will slide up into the shock mount as the shock compresses. When the car is down, install your washer and nut at the top of the shock mount.

That's it for this side. Do the other and go for a ride!

Edit - Read the comments in the original RegalGS.org thread too - Link
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Karma
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptySat Sep 20, 2008 11:32 am

so the people who were ordering me the RS-99251 shocks have informed me that they are discontinued. Does anyone know the part # of a "current" rancho shock that will work for this mod?

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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptySat Sep 20, 2008 2:57 pm

Not a clue. Maybe you should email Rancho tech support.
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Karma
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Sep 29, 2008 5:51 pm

bah, still no answer from tech support... some support they are....

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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 12:59 pm

I just blew out my right rear Rancho shock and need a replacement. I have spend 3hrs on the phone with Rancho and their IN distributer. The 99251 has been discontinued. A replacement would be their 5251 shock but it is not adjustable. Thankfully they will send me two of the 5251 to replace my blown shock due to warranty. After doing some research on the internet it looks like there are not any adjustable shocks available from any manufacturer other than ProComp and they are listed for 3"+ lifted F250's. I might go back to an airshock and sell the 5251 shocks. BTY the 99251 is for a 97-99 F250 <8500GVW.

Karma- I agree. the guy I spoke with, Joe, was an ass... their warranty girls are good to deal with though- just don't tell them it's for a custom app because the warranty goes out the window.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 1:05 pm

When I remove my old shocks I will measure them to see if there is a different app in the 9000 series shock that might work...

http://www.gorancho.com/products/docs/Specifications.pdf
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 6:06 pm

Man, that is serious bad news. Are you going to try the 5251's before going back to air shocks?
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 6:40 pm

That really is bad news. I never did the Rancho mod, but I liked having the option. That's too bad, seriously.

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'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 7:32 pm

Well there's still the option of custom Bilsteins, which might be worth it for ewolf's build wink
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 11:10 pm

am I the only one that doeasnt have air shocks?
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyMon Oct 27, 2008 11:53 pm

I am pretty sure I saw 'regular' shocks listed as optional replacements for the air shocks, so it's certainly possible that your car never had them (haven't seen one yet that didn't come with them OEM), or someone took them out and put standard shocks in their place.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 12:29 am

deekster_caddy wrote:
or someone took them out and put standard shocks in their place.

agree
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 12:41 am

Is That bad?
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 7:47 am

It's not bad, as long as your back end isn't sagging too much. If the back droops you'll need to deal with it a different way if you have no air shocks.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 1:53 pm

SuperRiv07 wrote:
Is That bad?

Only if your air pump has stopped working, or the lines gotten clogged with debris. IF that stuff's all o.k. you could switch back to air shocks at any time. Shocks aren't hard to change out and the air shocks don't cost too much.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 6:50 pm

where is this air pump located?
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 8:55 pm

SuperRiv07 wrote:
where is this air pump located?

It is under the rear section of the car. It should be a little bit before the rear wheels.

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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 9:43 pm

Like a lil before the rear wheels towards the front of the car?
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyTue Oct 28, 2008 11:22 pm

SuperRiv07 wrote:
Like a lil before the rear wheels towards the front of the car?

Yeah, you should be able to see it if you stick your head under the drivers side of the car. There will be a lever connected to the rear suspension.

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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyWed Oct 29, 2008 12:09 am

is there any way someone can get a pic of this??
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptyWed Oct 29, 2008 12:36 am


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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2
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robotennis61
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptySat Apr 18, 2009 1:58 am

will installing the rancho shocks on a 1" lowered riv, since they are designed for a truck,cause the ranchos to bottom out causing premature shock failure?
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Jack the R
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Jack the R


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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera EmptySat Apr 18, 2009 2:40 am

It's possible. Ewolfe had a shock blow out on his lowered Riv. I've had no trouble with mine with the stock springs (don't have as many miles on them). The guy who came up with this mod also had his Riv dropped however and I never heard of him having a problem.
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Write-Up: Installing Rancho F-250 shocks on the Riviera Empty
PostSubject: Re: Write-Up: Installing Rancho F-250 shocks on the Riviera   Write-Up: Installing Rancho F-250 shocks on the Riviera Empty

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Write-Up: Installing Rancho F-250 shocks on the Riviera
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