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Transmission acting up


skarloey
08-28-2003, 08:12 AM
I have a 2000 GP with auto transmission. It has been a little jumpy lately. It doesn't shift smooth (seems more noticeable when it is hotter). I changed out the tranny fluid and filter Saturday as a first step and it hasn't seemed to change anything. Any troubleshooting suggestions before I take it to a shop?

skarloey
08-28-2003, 10:57 AM
Here is info from AAMCO.com which seems to describe my problem pretty well...unfortunately I may be paying them a visit. :shakehead

Harsh down-shifts - Description:
The transmission seems to jerk into a lower gear when you let off the gas pedal after driving for some time. Harshness of downshift also occurs when you press on the gas pedal to go into passing gear- where the transmission is actually dropping into the next lower gear. This is not normal.
Possible reasons:
The throttle linkage is out of adjustment or damaged
The transmission fluid level is low or incorrect
There is an internal problem in the transmission
There is a problem with the engine
There is a problem with the electrical controls for the transmission
The vacuum modulator on the transmission is faulty or the vacuum line is damaged

Hard up-shifts - Description:
When the engine is warm and the transmission is placed into gear, there is a clunk or jarring motion. Often, as the gears change while driving, it feels unusually harsh and sudden.
Possible reasons:
The transmission fluid level is low or incorrect
The transmission fluid is dirty or contaminated
There is an internal problem in the transmission
The idle speed of the engine is too high
There are worn CV or U-joints
The throttle linkage is out of adjustment or damaged
The vacuum modulator on the transmission is faulty or the vacuum line is damaged

Ripn12s
08-28-2003, 06:10 PM
Any other details??

Like - mileage, GTP or GT (different tranny),any Mods done to the car

skarloey
08-28-2003, 11:21 PM
About 58,000 miles, no mods...this is a former company car, a plain SE (not GT). It is the original tranny.

Joey629
11-23-2003, 11:50 AM
I had the same problem with my 93 grand prix and it ended up being a simple temporary fix that you should try. it worked for me. My neighbor works at a GM dealership and i took him for a test drive in it. he said he sees this alot in Grand Prix's. Its the Tourque converter clutch on the front of the transmission. i guess its a bitch to fix but what you can do is just disable it and the car runs fine. there is an electronic plug on the front of the transmission that runs the TCC and if you unplug it your car will run fine and you don't need to change the whole TCC. He mentioned that it would hurt my gas mileage and that would be it but i haven't noticed that much of a difference. I hope this helps...it worked beautifully for me. good luck

kilroypr
11-27-2003, 06:42 PM
I have a 2000 GP with auto transmission. It has been a little jumpy lately. It doesn't shift smooth (seems more noticeable when it is hotter). I changed out the tranny fluid and filter Saturday as a first step and it hasn't seemed to change anything. Any troubleshooting suggestions before I take it to a shop?

I have heard the TCC plug trick. THis just disables the capability of the torque converter completly engage like a manual tranny where the clutch fully engage when the clutch pedal is depressed.
The only thing it would hurt to try is gas mileage but if works then all you have to ask for is to replace the TCC solenoid.

2001CAV
11-28-2003, 04:25 PM
I've Seen Alot Of Pressure Control Solenoids Put In For This Concern And It Normally Take Care Of It.it Is A Tough Job You
Might Want To Take It To A Dealership.the Side Cover Has To Come Of To Get To It.

kilroypr
11-29-2003, 06:55 AM
2001CAV is correct. It is not a tought job( if you have the right tools) for a dealership.

threebish
12-16-2003, 08:44 PM
I have a 2000 GP with auto transmission. It has been a little jumpy lately. It doesn't shift smooth (seems more noticeable when it is hotter). I changed out the tranny fluid and filter Saturday as a first step and it hasn't seemed to change anything. Any troubleshooting suggestions before I take it to a shop?
You might not like what I'm going to tell you, but my 2000 G.P. also had the symptoms that you have described. The end result was my transmission needed to be rebuilt. I curious how many other Grand Prix owners circa. 2000 have had similar problems. If considerable, maybe there might be some action we can take with G.M. to help fund the repairs?

kilroypr
12-18-2003, 08:57 AM
threebish there are 2 people here that knows where the recalls are posted. They are The Burning Rom and Ripn12s.
Pivate message them asking if there are any recalls for the transmision, in my case I have a 98 and had to replace it around 69kmiles(rather early on the car, even tought the car was flooded once).
I have seen that if they are not properly maintained they fail easly.
SkarLoey if what the transaxle do is slipage then Old school folks what usually did was add 8 ounces of brake fluid(that is correct, brake fluid) to regain normal shifting. If slipeage is the case this trick might work until you get enough money to reman it.

JJUBECK
12-18-2003, 11:43 AM
I have had the same problem three times since I have owned my GP. The dealer had to rebuild it twice and finally on the third time they replaced it with a new one. Hope you still have a warranty!!!

rockford0303
12-18-2003, 08:59 PM
This all sucks, Tranny problems I meen, I had a 92 GTP with a 4T60E trans and I had it get rebuilt 5 times. that sucked luckly it was under warranty after I got it rebuilt the first time. Im having pretty good luck with my 97 GTP trans I had like 1 weird shift about 20000 miles ago but nothing since. And the guys that have read my posts I now have hit 148xxx miles (w/mods) and its still shifts good. My mother has a 99 buick park avenue with a little under 50000 miles (3800 supercharged also) And her trans sucks Its all weird hard to explain... but anyways ever since I had my car i would always (still do) leave the performance shift on! I figure what its doing is increasing trans pressure which from what i know of will close the plates faster (giving you that harder shift) and will reduce heat from friction. Heat is the worst thing if its to hot.

kilroypr
12-18-2003, 10:12 PM
Really, I tought it was the other way around. Now I am trying to find the correct usage of the perfshift button. Cause now with the PCM it shifts from 3to 1st and OD to 2nd and sometimes you need it to stay on the higher shift and let the engine slowly gain on it. But I know that kind of shifting hurts it.
Sucks when you can feel the engine has a lot of power to deliver.
Did these car came with manual transmistions?
They should have been great.
I know the Z-34 came manual and was a real kicker.

TnT2000gt
12-22-2003, 08:04 PM
I have a 2000 GP with auto transmission. It has been a little jumpy lately. It doesn't shift smooth (seems more noticeable when it is hotter). I changed out the tranny fluid and filter Saturday as a first step and it hasn't seemed to change anything. Any troubleshooting suggestions before I take it to a shop?
skarloey, I am having the same problem with my 2000 GT(47000 miles). It would shudder at lower speeds when it was in "Drive". One time it felt like it was stuck in 4th gear after stopping a couple days before the SES light came on. The SES light came on and I took it right in to the dealer. They said it was a slipping error code. The Trans Tech at the dealer is on sick leave so they had to send it to a transmission shop. The Trans shop said the Manifold Pressure control soloenoid/valve was bad and burned 4th gear out. I had complained to this particular dealer two or three times while it was under warranty. Conveniently, they don't have a record of my complaints. The service advisor did not enter the issue into the computer when we complained. Service Advisor told me if the SES light wasn't on they wouldn't be able to do anything. My guess is they want to let it go until it's out of warranty so they don't have to pay. I am fighting with them as we speak about who should pay. Their offer so far is they pay for parts and I pay for labor. Not too excited about that. I plan to get ahold of GM customer relations to complain. Good luck with yours.

TnT2000gt
12-22-2003, 08:10 PM
I have a 2000 GP with auto transmission. It has been a little jumpy lately. It doesn't shift smooth (seems more noticeable when it is hotter). I changed out the tranny fluid and filter Saturday as a first step and it hasn't seemed to change anything. Any troubleshooting suggestions before I take it to a shop?
skarloey, I am having the same problem with my 2000 GT(47000 miles). It would shudder at lower speeds when it was in "Drive". One time it felt like it was stuck in 4th gear after stopping a couple days before the SES light came on. The SES light came on and I took it right in to the dealer. They said it was a slipping error code. The Trans Tech at the dealer is on sick leave so they had to send it to a transmission shop. The Trans shop said the Manifold Pressure control soloenoid/valve was bad and burned 4th gear out. I had complained to this particular dealer two or three times while it was under warranty. Conveniently, they don't have a record of my complaints. The service advisor did not enter the issue into the computer when we complained. Service Advisor told me if the SES light wasn't on they wouldn't be able to do anything. My guess is they want to let it go until it's out of warranty so they don't have to pay. I am fighting with them as we speak about who should pay. Their offer so far is they pay for parts and I pay for labor. Not too excited about that. I plan to get ahold of GM customer relations to complain. Good luck with yours.

Ripn12s
12-22-2003, 08:44 PM
http://www.subatomicdesign.com/tim/

Hawk239128
12-27-2003, 03:12 PM
I was driving the other day and my car suddenly dropped to first, made a scraping noise and wouldn't leave first. Then I found out that I can't put it into reverse, it acts as a neutral. I need some major help on this because it's my only car and I'm not too finacially sound right now.

kilroypr
12-27-2003, 04:24 PM
Well, to me look like the tranny is busted. A least 1 g you might need to fix it. Clutches, GOvernor or something big like that might be the problem and to get to them you have to break the tranny appart.

Ripn12s
12-27-2003, 04:27 PM
Do you have any Gears at all??

Kilroy, there's no gov in the transmission.

kilroypr
12-27-2003, 04:30 PM
Ripn12s, there is a round piece that you can pull out of the tranny. I was told that it is related to shifting to reverse. How you call that? and it is for shifting to reverse?

Ripn12s
12-27-2003, 04:33 PM
Kil,

There are alot of round parts inside the transmission.


Hawk,

You're going to have to take it to a shop. My car was just down for 2 months waiting on money and specific parts for my trans rebuild. $1600 bucks

kilroypr
12-27-2003, 04:41 PM
Ok, let me try this once more. There is an external round piece that has a pinion going into the tranny. It is not exactly inside the transmision. I have heard locally that technitians call it "gobernador" (a.k.a governor in spanish) and is related to shifting to reverse. WHen you get the tranny repair kit you get the gasket for it, it is not serviceable. When breaks you have to replace it.
That is what I am talking about. If you still do not know what I mean that is ok. Thanks anyway.

Hawk, when mine was replaced was because did exactly the same thing and the engine died on the process and as Ripn12s said. IT is a makor overhaul. IT has to be rebuilt

kilroypr
12-27-2003, 04:42 PM
it shifted to first and no other gear. I accelerated the car and when looked at the tack it was to late.

Ripn12s
12-27-2003, 04:57 PM
Kil,

Only thing remotely close to what u r talking about is the Reverse Servo or the Foward Servo. Those r the only 2 "round" things I can find in my manual that wouldnt require the trans to be opened up.

Hawk,

Another option might be to find a 2nd tranny and just put that in, but a shop will charge you about $500 just to drop and swap. So you're still looking at about a grand.

One other thing, Is the Range Selector Cable still together?? Its the cable in the engine bay around the airbox side of the motor. It has a rather large connector holding the 2 ends together.

Loss of connection integrity of the 2 metal couplings can cause loss of transaxle shift control which could result in personal injury - - GM Service Manual

kilroypr
12-29-2003, 12:54 PM
Ripn12s:

That is correctm the problem that I have locally is that as in this example the technitians translate something like the forward servo to the "gobernador". Thanks a mil.

Hawk:

To tell you the truth my dad has a 90 lumina, was lucky to find a 4to60e with decent mileage ($450.00) and to install it cost him around $500.00. Problem is that even tougt the guy installing might waranty his job no one even the scrap yard would waranty the tranny being installed

skarloey
11-13-2004, 10:09 PM
The problem persists as I originally described but I try to "baby" the car with my driving and it's something I have just lived with. Thanks to all for your input.

I did take this to Aamco for a free diagnosis. They couldn't tell that much was wrong but when I drove around with one of the techs, he noticed the obvious problem. He didn't have a definitive solution but read the codes from the CPU and found a few errors. He suggested taking it to a dealer or shop to troubleshoot. I still need to do this.

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