Tranny question - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-07-2005, 10:57 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Location: New Jersey
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Andrew97Cobra is on a distinguished road
Default Tranny question

I noticed over the last few months that the tranny in my '91 would not go into OD every now and then until it was fully warmed up.

This morning (probably the coldest morning since I noticed the OD thing), it first refused to shift out of 1st for the first mile of driving and then it eventually went into 2nd, but then it refused to go into 3rd for a little while. Then, it would not go into OD for a few miles (just like in the past). After about 10 miles of driving, the tranny started working totally normal.

The tranny has about 75k miles on it. I'm at work right now, so I have not yet been able to diagnose the obvious things.
Andrew97Cobra is offline   Reply With Quote
Old 09-07-2005, 11:19 AM   #2
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Ok..let'* start off easy.

When was the last time (if ever) the transmission fluid and filter was changed?
This problem only occurs when the transmission is cold?
BillBoost37 is offline   Reply With Quote
Old 09-07-2005, 11:29 AM   #3
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Location: New Jersey
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Andrew97Cobra is on a distinguished road
Default

The fluid and filter were last changed about 20k miles ago.

The problem has only occurred until the car was driven at most 10 highway miles, so I am assuming that the fluid was hot by then. What happened this morning with the 1-2 and 2-3 upshifts lasted only a couple of miles. I only had the OD issue by the time I got on the highway.
Andrew97Cobra is offline   Reply With Quote
Old 09-07-2005, 11:38 AM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Start off by checking the fluid level and how it looks.

On a 00 pickup i have the computer delays shifiting points to help the motor heat up, but I doubt they had that on this gen bonne. Still..trans shifting is controlled by the computer.
BillBoost37 is offline   Reply With Quote
Old 09-07-2005, 11:48 AM   #5
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Location: New Jersey
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Andrew97Cobra is on a distinguished road
Default

Just walked outside to check the fluid and it'* full. It doesn't smell burnt and the color looks normal for used tranny fluid.

Are you sure that the shifting is controlled by the computer in this case? The tranny has a TV cable and the only electrical connections that I can see are two wires to a black round plug on the side of the tranny facing the radiator. I don't have my shop manual here, so I don't know what that is.
Andrew97Cobra is offline   Reply With Quote
Old 09-07-2005, 11:55 AM   #6
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

From the driverside strut tower follow the shifter cable down to the tranny. Now look about within a 6 inch radius from it.. You should see a connector with more wires.

But no..I'm not 100% I'm going off what I know of a 90
BillBoost37 is offline   Reply With Quote
Old 09-07-2005, 11:56 AM   #7
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

The trans in the 91 Bonneville is still a THM440-T4( 4T60 )... Its a fully hydraulic unit with the exception of the TCC solenoid and the gear switches inside the tranny so that the ECM knows what gear the tranny is in for both load factors and TCC apply...

It sounds almost like you have a sticking TV, or valves in the valve body....

Have you tried adjusting the TV cable to see if that makes a diffrence... we may suggest changing the fluid again, and possibly adding an additive that will not harm the clutches and or bands...

The connector on the 88-91 bonnies on the front of the trans is a 5 wire connector..

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 09-07-2005, 12:14 PM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Location: New Jersey
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Andrew97Cobra is on a distinguished road
Default

Nope. Definitely no connectors around the shifter cable area.

I was wrong about that connector on the front of the tranny. It'* a 5 wire connector. At a quick glance, I didn't see all the wires underneath the top 2.

I just tried adjusting the TV cable at the TB and it pretty much clicked back to where it was before.

I guess that I wouldn't mind changing the tranny fluid and filter again. Any recommendations on additives?
Andrew97Cobra is offline   Reply With Quote
Old 09-07-2005, 12:22 PM   #9
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by Andrew97Cobra
Nope. Definitely no connectors around the shifter cable area.

I was wrong about that connector on the front of the tranny. It'* a 5 wire connector. At a quick glance, I didn't see all the wires underneath the top 2.

I just tried adjusting the TV cable at the TB and it pretty much clicked back to where it was before.

I guess that I wouldn't mind changing the tranny fluid and filter again. Any recommendations on additives?
I have used a few diffrent additives in my cars... But I made sure the bottle said " Will not Harm Clutches and Bands " .... There are a few out there that have friction modifiers in them and that will pretty much destroy the clutches in short order... It almost like adding a bit of oil to a trans.... we all know that trans death in a hurry... I have seen a couple of people do this before..

I think I have used Duralube trans treatment, and Slick 50 tranny treatment... There was another... I used them simply to see if it would kill off my tranny... Its still with me...

At the time my friend had a 2.97 from a Caddy( had some upgraded parts as it was for the V8 application ) I wanted that trans... Mine just wouldn't quit... The additive seemed to do it no harm.... I'm at 123,000 on the 91, and with the florida heat most don't get that far...

I'd say don't flush it right away, that may make the issues worse... Drop the pan, get a filter and gasket kit from Advance Autoparts ( theirs will have a rubber gasket ) and use an additive to see if it whill help free anything up... Hoping for the best

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 09-07-2005, 12:36 PM   #10
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Location: New Jersey
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Andrew97Cobra is on a distinguished road
Default

I guess that I'll take a ride to the local Pep Boys or Autozone on my lunch break to see what additives they have. Most of the miles on this tranny are highway miles, so it would seem like it'* a little soon for a rebuild.

If you take away the cold temp issues, the tranny upshifts and downshifts perfectly and reverse works just fine.
Andrew97Cobra is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Tranny seal softener question / tranny question satsuke 1992-1999 9 09-20-2005 09:28 PM
Tranny swap to manny tranny BonEvilSSEi 1992-1999 2 05-24-2004 01:04 AM
Tranny cooler? and other tranny questions............ killer_cr80r Lounge 1 05-12-2004 10:01 PM
Tranny clunk and tranny slippage nething to worry about look killer_cr80r Lounge 4 04-20-2004 01:00 PM
Please read. Tranny problems with a newer tranny? bonnie94ssei General GM Chat 7 11-03-2003 02:44 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:13 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.