Shot Transmission? Shaking car at 40mph+? - 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 10-14-2004, 12:16 AM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default Shot Transmission? Shaking car at 40mph+?

I know I have been sort of a post ***** lately but please forgive me I am just trying to make sure I can sell this one and get a newer bonnie .

Well I am having a strange tranny problem.

I have searched this forum and I came up with a few posts displaying problems but none of them that I found really covered what is going on here.

I know the tranny has 218,000 on it and it is the orginal case, so who knows if it has been rebuilt or not, but that is besides the point, The car if it runs is worth maybe 600 bucks so I would like to get that instead of maybe 200 if the tranny has to be put in.

87 by the way.

Heres what it is doing:

It has only done it a few times but all of these times were before I screwed with the thottle body and the sensors up there.

When driving at 35mph up to 75 whent he car is at a steady speed and also when you are accelerating sometimes it will JERK VERY HARD, but I dont believe it is trying to go into second, it might but it just seems to shake once maybe twice and then it stops. It is COMPLETELY RANDOM from what I can tell. Again it does not do it in second from what I can tell, only 3rd and OD.

Is there ANYTHING that can be done to fix this problem without dropping the tranny? or anything that I can check to see what is going on?
Hans is offline   Reply With Quote
Old 10-14-2004, 01:10 AM   #2
Senior Member
Posts like a Supercharger
 
Join Date: Jun 2004
Location: Maine USA
Posts: 151
Thanks: 0
Thanked 0 Times in 0 Posts
smoosh is on a distinguished road
Default

didnt the 87 bonnies have a balance issue with the engine tranny?..which was fixed in the 5 pin TCC plug 4T60 and the VinC 3800?
smoosh is offline   Reply With Quote
Old 10-14-2004, 01:24 AM   #3
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

Quote:
Originally Posted by smoosh
didnt the 87 bonnies have a balance issue with the engine tranny?..which was fixed in the 5 pin TCC plug 4T60 and the VinC 3800?
I dont think this is a matter of whether it is balanced.


The car shakes suddenly when at low as well as higher revs at high speed.

I was thinking maybe a vaccum modulator? would that screw this car up when it is NOT ACTUALLY SHIFITING?

To describe the problem more vividly.

It feels like a VERY hard 3 to 2 downshift.....
Hans is offline   Reply With Quote
Old 12-16-2004, 03:08 AM   #4
Junior Member
 
Join Date: Sep 2003
Location: Tooele Utah
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
shayneholmes is on a distinguished road
Default

you might want to have the spider gear checked out on your transmission. I am having a problem with mine currently. I get a vibration around 50 + miles an hour... and it is especially worse if i am accelerating around a corner ... The spider gear allows one tire to spin faster than the other tire for when you are turning and such. And ill just tell you that the way i found out mine was bad was i jacked up the car and put it in gear with the wheels off of the ground and after i reached about 40 mph on my speedometer the engine would start shaking from side to side off and on really bad. I thought i had a bad engine mount but they were okay... But it was the tranny and engine jerking back and forth from the play in the spider gear.
shayneholmes is offline   Reply With Quote
Old 12-16-2004, 08:54 AM   #5
Senior Member
Certified Car Nut
 
Join Date: Jul 2003
Location: Robbinsdale, MN
Posts: 15,408
Thanks: 0
Thanked 0 Times in 0 Posts
MOS95B is on a distinguished road
Default

Quote:
Originally Posted by jr's3800
Are you sure its not a nasty missfire? If it is it will be most noticeable in 3rd or 4th gear with TCC lock up under load..
What he said. One of our least frequent members, Noot, just fixed a similar "tranny" problem by putting the correct plugs in all 6 cylinders....
MOS95B is offline   Reply With Quote
Old 12-16-2004, 10:20 PM   #6
Senior Member
Posts like a Camaro
 
padgett's Avatar
 
Join Date: Jul 2003
Location: Orlando, Florida
Posts: 872
Thanks: 0
Thanked 0 Times in 0 Posts
padgett is on a distinguished road
Default

If you have the stock Magnavox ignition, a failing coilpack can do that particularly if the plugs or wires are getting marginal.

Misfire can feel like just about anything possible so I always check for that first. For me it is usually most noticable when going up a slight grade in cruise at 50 mph (o/d & lockup) - low rpm & moderate load.
padgett is offline   Reply With Quote
Old 12-19-2004, 07:42 AM   #7
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

96% sure it was a failed torque converter.

The car had 220,000, all orginal and it was abused by previous owner - as well as myself was a little hard on it at times.

Money pit.

The engine still runs like new but needed new paint really bad along with body work.

Plus the suspension was shot, rear struts leaked.


I had to sell it though.

The now $300 car is still on the road however. It is now servering a great winter beater for somebody that does not want to trash their new car with our roads in the winter here.
Hans is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Car dies out, no stumble,no shaking. da_grey_goose_95 1992-1999 3 07-26-2009 08:12 PM
shot transmission mount question egladman 1992-1999 0 06-02-2007 12:33 PM
Shaking car Nashville Cowboy 2000-2005 37 01-26-2007 06:00 PM
transmission is shot. mod or buy new one? xkeithx 1992-1999 5 03-27-2006 12:38 AM
What causes SHUDDERING at 35-40mph (3rd gear) Hans 1992-1999 61 08-02-2005 04:44 PM


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 04:18 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.