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 Write-Up: Filled Rear Motor/Transmission Mount

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Sir Psycho Sexy
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Mon Dec 15, 2014 8:56 pm

The front trans mount on your 99 is different though, isn't it? It's like the Park Ave ones where there is a rod that goes through a cylindrical mount vertically into the subframe, right?
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charlieRobinson
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Mon Dec 15, 2014 8:58 pm

Yeah. I dont think it looks like that.

Didnt you mention somethin about it saturday? it freaks you out, no?
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Sir Psycho Sexy
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Mon Dec 15, 2014 9:00 pm

Yeah, I was like, "yours is different than mine!" razz

But seriously, It is definitely not the same mount as my car has.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 8:37 am

If the '99 has the big round mount in it, they're absolute junk. You may as well just put hockey pucks up front as soon as you can. Every single Lucerne or PA that comes in here for service has that mount just absolutely BLOWN OUT. The Acadia (and similar) has a mount like that as well. We replace them constantly....
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 9:14 am

Turbo Tim at ZZP is suggesting I go with 2 pucks instead of 3 to pull everything forward and give extra clearance for the rear header.

What do you guys think about that?


I will get pics soon.

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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 9:26 am

That doesn't sound like a bad idea, however a whole inch on the front is going to be 2" in the rear. I think I might cut a puck in half so the distance isn't so drastic.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 9:29 am

What if I do 2 pucks plus some shims in between?
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 9:30 am

charlieRobinson wrote:
What if I do 2 pucks plus some shims in between?

That would be the same as cutting one in half lol Just get some giant washers or something...
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 2:27 pm

What does your original front mount look like?

this?

or something like this?

Sorry If I'm beating the horse dead a little bit but I just wanna make sure you're not gonna make the same mistake I did that basically cost me a subframe
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Tue Dec 16, 2014 3:03 pm

B. the squashed mushroom on a stick.

。。Time to make some new mounts.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 2:17 pm

Ok yeah you're good then with the vertical stack of hockey pucks up front. I was like the second person who tried running that kind of mount on a 98-down riv that doesn't have that kind of mount originally and it turned really bad since the subframe was not meant for it.

I would maybe suggest what I did with the puck arrangement though and have a couple pucks above the engine bracket as well as below to have some dampening both ways (rocking up and down) in theory like the original mount allows for. With having pucks just underneath the bracket it's more like literally a solid mount while receiving positive torque from the drivetrain - loading. The pucks don't seem to allow for any movement but they do dampen a little which helps reduce shock load stresses on the fasteners and subframe structure I reckon.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 2:26 pm

Charlie did you already buy a new rear? I found the one I had.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 2:35 pm

turtleman wrote:
Ok yeah you're good then with the vertical stack of hockey pucks up front. I was like the second person who tried running that kind of mount on a 98-down riv that doesn't have that kind of mount originally and it turned really bad since the subframe was not meant for it.

I would maybe suggest what I did with the puck arrangement though and have a couple pucks above the engine bracket as well as below to have some dampening both ways (rocking up and down) in theory like the original mount allows for. With having pucks just underneath the bracket it's more like literally a solid mount while receiving positive torque from the drivetrain - loading. The pucks don't seem to allow for any movement but they do dampen a little which helps reduce shock load stresses on the fasteners and subframe structure I reckon.


I was going to do pucks between the trans and cradle and then Energy bushings above and below with some big thick washers on top and below the bushings.


Wish you wouldve gotten to me sooner on that rear! Mine is in the mail and should be here tomorrow!
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 6:51 pm

Good job, Rock Auto. You sent me this one.. and not the '99 part. Not that I need it but still..


Hoping this is the correct rear trans mount for the '99.


Do you guys just fill all cavities with window weld?
Is it that easy?
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 9:49 pm

Yes, It's really that easy. Make sure you wear gloves! If you get some on your hands, have fun getting it off you and anything you touch. You will be scrubbing your hands for awhile. Ask me how I know.

Also, make sure you let it cure for at least four days. I don't think it "fully" cures for about three months, but it gets hard to the touch in about four days.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 9:51 pm

How do you know, Daymon?
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 9:56 pm

charlieRobinson wrote:
How do you know, Daymon?
Because I got some on my hands. It was one of those dumb teenage decisions that I make sometimes. I figured it couldn't be that bad, and didn't wear any gloves.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 9:57 pm

I mean, were you filling a mount or what were you doing playing with 3M goo?
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 9:59 pm

I was filling a mount.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Wed Dec 17, 2014 11:30 pm

KnottyEagle wrote:
Yes, It's really that easy. Make sure you wear gloves! If you get some on your hands, have fun getting it off you and anything you touch. You will be scrubbing your hands for awhile. Ask me how I know.

This. I can't even explain how accurate this is. Get the long gloves that go up your arm unless you shave. I baked my mounts in the oven for like 8 hours at the lowest possible temp because I needed them same/next day.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Thu Dec 18, 2014 12:21 pm

So the 99 is the black sheep, huh? Looks my rear and front mounts are not the same as you 98 and older dudes.

EDIT: Taking this puck/front mount stuff and moving it to the correct thread


Last edited by charlieRobinson on Thu Dec 18, 2014 12:44 pm; edited 1 time in total
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Thu Dec 18, 2014 12:43 pm

My $.02

Realistically, simply putting pucks in there is nothing more that a solid mount. You may as well axe the pucks and just put a steel sleeve. The original mount is made to flex upward, which is why they pull apart so often with some abuse. Anything other than that mount is just going to be pulling on the giant stud you use...no flex whatsoever, pucks or not. So, at that point, the pucks are merely just filling space. You'd have to figure out a way to make some sort of cushion that attaches between the bolt and the cradle on the bottom side if you want any sort of dampening.
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Thu Dec 18, 2014 2:25 pm

Im ok with the solid mount, using pucks or a boat roller for spacing. But I do agree there should be some kind of cushion between the cradle and the mount, top and bottom. I see this lacking from a lot of designs I am seeing.

I am afraid sway bar bushings may be too small. I might cast my own 60A window weld bushings or get some Energy general purpose bushings. I want something fat and juicy on both sides to dampen the mount.

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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Thu Dec 18, 2014 2:59 pm

charlieRobinson wrote:
I am afraid sway bar bushings may be too small. I might cast my own 60A window weld bushings or get some Energy general purpose bushings. I want something fat and juicy on both sides to dampen the mount.

I completely agree about the link bushing. It's way too small IMO. I'd almost think that you could take a puck and form it to the underside of the cradle, so it fit nice and snug and absorbs energy equally. Or find a cradle mount of some sort to use in it's place....
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PostSubject: Re: Write-Up: Filled Rear Motor/Transmission Mount   Thu Dec 18, 2014 3:36 pm

only thing about the pucks is that they are like 80B or something rated. I want something a little softer at the ends against the metal.

I am considering making some 3d printer molds and casting my own poly bushings.

I know the front header is quite close to the top of the front trans mount so its going to be a tight fit, probably.
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