transmisssion "slipping" code
Thread Starter
Instructor
Joined: May 2000
Posts: 104
Likes: 0
From: Portage Indiana
transmisssion "slipping" code
Some time ago, I changed my torque convertor to a 2400 rpm stahl, my car behaved just fine. Later, I changed the rear from a 3:15 to a 3:73. I drove the car from where I made this change, about 8 miles and got an expected "check engine lioght". I knew I'd have to have the computor re-calibrated so I sent it in to Breathless. After re-installing the computer that was re-calibrated for the rear change, I drove the car. Shortly I got a "transmision slipping" code. I altamately took my car to Chevy, and after a $75.00 diagnostics charge, I was told that "there's nothing wrong with my transmission. As I continue to drive the car, I continue to get the "transmission slipping code" and the trans acts fine while cold but shifts extreamally hard when up temperature. Any ideas? :cheers: :cheers:
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 1
From: Winston Salem NC
Re: transmisssion "slipping" code (SteveElliott)
The PCM thinks the trans is slipping. In order to protect the clutches it is boosting the line pressure, causing hard, no slip shifts. A 2400 converter should not be causing your problem. Most of us with higher stalls don't experience codes. Incorrect settings for the new gears can and usually will set codes. That would be my first guess.
Melting Slicks
Joined: May 2001
Posts: 2,262
Likes: 0
From: Huntington Beach CA
Re: transmisssion "slipping" code (SteveElliott)
Programming will fix this. Unless your stall is extremely high, but I have yet to get these codes and I have a 3500 stall. For the quickest fix try LS-1 edit.
[Modified by Untouchable00, 10:33 PM 12/11/2002]
[Modified by Untouchable00, 10:33 PM 12/11/2002]
Race Director
Joined: Aug 1999
Posts: 15,466
Likes: 0
From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Re: transmisssion "slipping" code (SteveElliott)
Did you tell Breathless that you also changed the T/C? A programming adjustment should take car of the problem.
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Re: transmisssion "slipping" code (SteveElliott)
It's pretty easy to distinguish whether you really have component slippage or a programming problem. If you collect some data with your handy scantool you can tell almost immediately if the programming is correct. The items of interest are:
engine speed
vehicle speed
current gear
trans input speed
trans output speed
TCC slip speed
Several minutes of this through a broad range of RPM will be sufficient. A little math and a graph and you have your answer.
engine speed
vehicle speed
current gear
trans input speed
trans output speed
TCC slip speed
Several minutes of this through a broad range of RPM will be sufficient. A little math and a graph and you have your answer.
