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 Transmission slow to shift - any ideas???

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playa
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PostSubject: Transmission slow to shift - any ideas???   Thu Feb 23, 2012 1:22 am

I am in tune with my car like no other. I noticed just briefly that the up shift was slow (or drawn out would be the right description). I also noticed that in 4th, when I let my foot off the gas, rpms drop instantly. Normally, its a gradual decline. Part of me thinks I'm still in 3rd (RPMs at 2200 at 60 mph - is that 3rd or 4th?) The Riv just passed 145,000 miles and I've never had a tranny issue - always maintained the fluid and have changed both the filter and fluid within the last 10,000. At this point, it's a slight annoyance and 95% of the time, it acts normal.

I'm just thinking there may be a bigger issue here that if I deal with now will save me alot of headache and money later on. What say you guys. Is there a module that's pron to fail on these trannys or some minimal maintenance above and beyond fluid and filter changes that I should be aware of.
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c0reyl
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 7:38 pm

I'm interested in this as well, my car seems to do this too.

sometimes when I step on it, I get no acceleration, and other times, it hauls ass. I have no idea why it's so damn inconsistant.
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LARRY70GS
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 8:08 pm

When I'm doing 60 MPH in OD and the converter is locked up, I'm at 1600 RPM. Sounds like you are in 3rd gear.

_________________
98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
11.67 @ 115.49 MPH So far
http://s172.photobucket.com/albums/w20/SLD1624/?action=view¤t=00004_zpsfda10b01.mp4
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 11:02 pm

LARRY70GS wrote:
When I'm doing 60 MPH in OD and the converter is locked up, I'm at 1600 RPM. Sounds like you are in 3rd gear.

Bingo. It didn't dawn on me till I started the post and started writing that maybe the high speed issue is the fact that I was still in 3rd. On my way home, I tested that theory and sure enough - 4th/OD is no bueno. That sucks.

So, am I to assume there's a problem internally or could it be a computer issue? No codes have been thrown visually that is.
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albertj
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 11:04 pm

playa wrote:
I am in tune with my car like no other. I noticed just briefly that the up shift was slow (or drawn out would be the right description). I also noticed that in 4th, when I let my foot off the gas, rpms drop instantly. Normally, its a gradual decline. Part of me thinks I'm still in 3rd (RPMs at 2200 at 60 mph - is that 3rd or 4th?) The Riv just passed 145,000 miles and I've never had a tranny issue - always maintained the fluid and have changed both the filter and fluid within the last 10,000. At this point, it's a slight annoyance and 95% of the time, it acts normal.

I'm just thinking there may be a bigger issue here that if I deal with now will save me alot of headache and money later on. What say you guys. Is there a module that's pron to fail on these trannys or some minimal maintenance above and beyond fluid and filter changes that I should be aware of.

Is your CEL/SES on?
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 11:11 pm

albertj wrote:
Is your CEL/SES on?

Nope. What quick research I've done points to a stripped 4th gear clutch hub. The part I've read is $60 but as anybody attempted a switch out on this type of transmission
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albertj
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 22, 2012 11:31 pm

if there is any indication your car was wrecked or rolled at some point in the past look for a problem in the transmission linkage/wiring. If not, could maybe be a PCM problem but more likely something is telling your transmission it's facing too high a load.

What I would do:

- drop the pan and look for fragments
- see if you can find someone with a Tech II and take a log of the sensors on a test drive. You'll be able to read transmission pressures and stuff and on the driving log you'll be able to identify what's not doing what it is supposed to do. You can take **the same** log using Alex Peper's Car=Code software (http://www.obd-2.com). Once you have a log of the driving you can play it back. With Car-Code you can even set the "dash" gauges to read out various values, stop the log playback and change the gauges to read other values. It should not take *too* long to figure out what's going on.

I suspect you'll figure out at least part if not all of the mystery when you drop the pan and look for shrapnel.
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AA
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PostSubject: Re: Transmission slow to shift - any ideas???   Thu Feb 23, 2012 12:38 am

Do you get 4th gear at any time, or is it gone entirely?

_________________
'98 SC Riviera 268k 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
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Thu Feb 23, 2012 3:22 am

Appears it is gone entirely. Mind you, I haven't heard or felt anything that would suggest a catastrophic failure - that's why I'm asking if there's a module that could be going bad, but from all the sites I've visited, the 4th gear shaft is a primary culprit for the 4t65E transmissions - Bright side, I still have the 3 most important gears happy
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PostSubject: Re: Transmission slow to shift - any ideas???   Thu Feb 23, 2012 4:14 pm

Mark,
Have you tried leaving the selector in "3", and then moving it to OD at around 45 MPH?

_________________
98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
11.67 @ 115.49 MPH So far
http://s172.photobucket.com/albums/w20/SLD1624/?action=view¤t=00004_zpsfda10b01.mp4
http://s172.photobucket.com/albums/w20/SLD1624/?action=view¤t=00003_zps32ac4f89.mp4
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Fri Feb 24, 2012 1:24 pm

LARRY70GS wrote:
Mark,
Have you tried leaving the selector in "3", and then moving it to OD at around 45 MPH?

Yep. Sorta sucks too. I just bet my father in law that his transmission in his Chrysler van will go out this year- 250,000 miles and he's changed the fluid once. I change mine every 15-20K miles and this is what happens. Like I said, I still have 1-3 and thankfully, I've got options if a rebuild is necessary. I'm half tempted to do it myself. You know how many good Buicks I see with bad trannys selling for dirt cheap.
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AA
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PostSubject: Re: Transmission slow to shift - any ideas???   Fri Feb 24, 2012 1:32 pm

Unless you've rebuilt an automatic before, might want to leave it to a pro. You can save a lot of money though by removing and installing the unit yourself.

_________________
'98 SC Riviera 268k 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
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Fri Feb 24, 2012 6:33 pm

Well, took it over to local tranny shop with decent reviews. They threw it on the machine- confirmed that the computer is telling it to shft - but that the gear is not responding. They said they couldn't tell if it's a solenoid issue of the shaft issue until they tore into it. That said, I'm content in knowing that my other gears are there and responding. I've read that some people go months just with the 3 gears. price quote $1900 to R& R and additional costs if hard parts need replacing like gears, shafts, butt lube. afraid
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playa
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 29, 2012 3:53 am

Dropping off the Riv tomorrow to the shop. Called 3 places and after comparing prices, warranty and my overall judgement - I settled on Ammco. That is the one I got the best vibe from and online they had awesome reviews at that location. I'll be asking to see the parts they replace and they seemed pretty receptive to taking pictures and giving me any info that you guys would find useful. Plus, they said they would honor a military discount which is always a +. Anyway, will find out more shortly and I fill you all in on what happens
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Jason
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PostSubject: Re: Transmission slow to shift - any ideas???   Wed Feb 29, 2012 2:49 pm

The "soft shifting" or gradual degradation in performance could be poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Seal restorer may fix the latter, but you're probably looking at R&R.

Can you confirm that you have both 1st AND 2nd gear ? i.e. that you only have 4th gear missing ? not 1 AND 4 or 2 AND 4 ?
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Transmission slow to shift - any ideas???

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