A/T Problems - help needed
Thread Starter
Instructor
Joined: Mar 2007
Posts: 173
Likes: 18
From: Edinburgh Midlothian
A/T Problems - help needed
Hi
The A/T in my 89 Coupe has start shifting strange, The issues are as follows.
1 - 2 shift - on light throttle, doesn't happen until 18 mph (2000 rpm)
used to change up a 10 mph
Full throttle shifts occur at 5500 rpm, used to shift at 4500 - 4800 rpm.
The fluid is not discoloured, still pale red, but has a slightly burnt smell.
the Tv cable has been adjusted in accordance with Gm guidelines, and at W.O.T there is no slack in the cable.
The TV cable isn't binding and if pulled retracts quickly.
Does anybody have any ideas what could be causing this sudden change in how the transmission is shifting.
Any help or suggestions would be greatly appreciated.
The A/T in my 89 Coupe has start shifting strange, The issues are as follows.
1 - 2 shift - on light throttle, doesn't happen until 18 mph (2000 rpm)
used to change up a 10 mph
Full throttle shifts occur at 5500 rpm, used to shift at 4500 - 4800 rpm.
The fluid is not discoloured, still pale red, but has a slightly burnt smell.
the Tv cable has been adjusted in accordance with Gm guidelines, and at W.O.T there is no slack in the cable.
The TV cable isn't binding and if pulled retracts quickly.
Does anybody have any ideas what could be causing this sudden change in how the transmission is shifting.
Any help or suggestions would be greatly appreciated.
Le Mans Master
Joined: May 1999
Posts: 6,513
Likes: 1,301
From: Windermere FL
If you only had the full throttle shift problem, I would say to remove the governor and see if it is sticking, or maybe just replace it. But since you are having 1-2 shift problems too, I doubt that is the case.
I take it that you did NOT try to adjust the TV adjustment first, and then these troubles started?
That burnt smell is not good at all. Sounds like some clutch packs may be toasted.
Have you ever done a tranny fluid exchange? If not, it might help, but doubtful.
Start saving for a rebuild.
That burnt smell is not good at all. Sounds like some clutch packs may be toasted.
Have you ever done a tranny fluid exchange? If not, it might help, but doubtful.
Start saving for a rebuild.
Intermediate
Joined: Feb 2009
Posts: 40
Likes: 0
From: Panora IA
Don't know about your problem, but I have a similar issue that I don't get.
My auto works perfectly if I leave it in drive. If I shift it myself and then come to a complete stop, it won't downshift either automatically or manually. It will start out then in 2nd or 3rd. I also can't downshift it from drive to other 3, and so forth. Gary:o
My auto works perfectly if I leave it in drive. If I shift it myself and then come to a complete stop, it won't downshift either automatically or manually. It will start out then in 2nd or 3rd. I also can't downshift it from drive to other 3, and so forth. Gary:o
Thread Starter
Instructor
Joined: Mar 2007
Posts: 173
Likes: 18
From: Edinburgh Midlothian
update
Just took the car out again, after rechecking the TV cable adjustment, now at WOT no upshift at all, engine went to 5600 rpm where I lifted off, and it then upshifted.
Having looked at the Service Manual, it is indicating a governor problem, what is involved in changing the governor.
Having looked at the Service Manual, it is indicating a governor problem, what is involved in changing the governor.
Le Mans Master
Joined: May 1999
Posts: 6,513
Likes: 1,301
From: Windermere FL
After you pry it off, a very small amount of tranny fluid will leak out. Not a lot. You just rotate the governor to pull it out. Unless yours has no teeth left, then it will pull straight out.
There is a plastic gear on the end which is usually the part that wears out. If the teeth are eaten, then a new governor should fix it right up for cheap.
If that fixes it, I would do a fluid exchange after wards.
When you get a new one, make sure you get the 'Corvette' governor, else you will no longer have the hi performance shift points.
Last edited by Flame Red; Jul 23, 2009 at 12:34 PM.
