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Old 12-09-2011, 03:22 PM
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1993 4t60e to 1997 car

Hi guys, new here. I'm in desperate need of help. I recently swapped the trans in my 1997 Buick Lesabre from its 1997 4t60e to a 93 buick lesabre trans, also a 4t60e.

Upon test drive I noticed the car was stuck in 2nd gear. Never shifts to third but it doesn't hold the throttle at the rpm like being in second gear does. Also cooling fans are always on when the car is running.

First clues pointed to bad shift solenoid. So i went to the parts store and ran codes. Here's what I got:
P0713-Trans Fluid Temp Sensor A circuit High Input
P0740-TOrque Conv. Clutch Solenoid Circuit/Open
P0753-Shift Solenoid A Electrical

So all these signs are pointing to my pinout on my 97 being different than the pinout on a 93.

Upon a little research I found that swapping harnesses inside the trans would fix the problem. Thing is, I dont know how to swap them or what connections I need to make, vice versa. So if anyone could possibly give me 2 diagrams, a 97 4t60e pinout and a 93 4t60 pinout, I'd be so grateful.

Also, If it is just as simple as swapping the harnesses, can I do it without removing the trans from the car?
Thanks again for any help,
John
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Old 12-09-2011, 06:51 PM
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Quote:
Originally Posted by wastehog
Hi guys, new here. I'm in desperate need of help. I recently swapped the trans in my 1997 Buick Lesabre from its 1997 4t60e to a 93 buick lesabre trans, also a 4t60e.

Upon test drive I noticed the car was stuck in 2nd gear. Never shifts to third but it doesn't hold the throttle at the rpm like being in second gear does. Also cooling fans are always on when the car is running.

First clues pointed to bad shift solenoid. So i went to the parts store and ran codes. Here's what I got:
P0713-Trans Fluid Temp Sensor A circuit High Input
P0740-TOrque Conv. Clutch Solenoid Circuit/Open
P0753-Shift Solenoid A Electrical

So all these signs are pointing to my pinout on my 97 being different than the pinout on a 93.

Upon a little research I found that swapping harnesses inside the trans would fix the problem. Thing is, I dont know how to swap them or what connections I need to make, vice versa. So if anyone could possibly give me 2 diagrams, a 97 4t60e pinout and a 93 4t60 pinout, I'd be so grateful.

Also, If it is just as simple as swapping the harnesses, can I do it without removing the trans from the car?
Thanks again for any help,
John
the only suggestion i can give at this point is to tell you to pull the side cover on each trans. yes, you can swap out the harnesses but, your also going to have to do ohms checks on all the electronics and make sure theyre the same as it may be more than just the harness pin placement being different. the biggest thing is, im not quite sure that the 93 was a PWM trans and the 97 for sure is. if that be the case, if you want to swap the stuff out/around, then your also going to have to swap the converter as well as the clutch lining in it is different than the 93.
not to burst your bubble but, it really should have the proper year trans in the car.
if your dead set on trying to make it work, then pull the trans so you can swap the converter as well. the side cover can be removed with the trans in the car but, with what i mentioned, theres no point in just doing the side cover. sorry guy.
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Old 12-12-2011, 08:26 AM
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Thanks a bunch for the advice. The Trans isn't the wa2 option that you were thinking o LT which uses a special torque converter. My research pointed to me my car should have a newer Trans then it did, but mine had to be an early build. Anyways, the only problem I've read I might have is the older Trans wont use a certain feature of which I can't recall right now.

Also, how do I remove the harness from the Trans? Mainly just the bulk head.

What is the procedure to remove the side cover, because by my looks it seems there isn't enough room to get it out? (Not trying to be smart, just looking for guidance.)
Ohm checks, basically just make sure the ohm loads match the new ones vs the old? If not could you please explain.
Thanks John
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Old 12-12-2011, 12:43 PM
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Quote:
Originally Posted by wastehog
Thanks a bunch for the advice. The Trans isn't the wa2 option that you were thinking o LT which uses a special torque converter. My research pointed to me my car should have a newer Trans then it did, but mine had to be an early build. Anyways, the only problem I've read I might have is the older Trans wont use a certain feature of which I can't recall right now.

Also, how do I remove the harness from the Trans? Mainly just the bulk head.

What is the procedure to remove the side cover, because by my looks it seems there isn't enough room to get it out? (Not trying to be smart, just looking for guidance.)
Ohm checks, basically just make sure the ohm loads match the new ones vs the old? If not could you please explain.
Thanks John
after some thinking, unless the trans you put in is PWM, it isnt going to work as the valve bodys are different. youre going to have to get a trans thats PWM.
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Old 12-12-2011, 09:10 PM
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Yeah, that makes sense. Any way to switch valve bodies?
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Old 12-13-2011, 12:50 PM
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sorry about the time delay on response but, i didnt want to answer that untill i was sure on the answer which i had to get at work.
because of the PWM, the valve bodies cannot be swapped.
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Old 12-14-2011, 10:12 AM
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No problem. That really sucks. What does the pwm do anyways? Doesn't it just lock the TC? And is there anyway you could get a diagram of the 97 Trans wiring? Also, your not thinking pwm as in the Tc timing option are you?
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Old 12-14-2011, 10:27 AM
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PWM means PULSED WIDTH MODULATION. The computer is able to use variable pulse rate to modulate lockup apply pressure and ramp it up more slowly, or to use partial lockup under certain conditions. The PWM converter has what we call a "woven" lining that will withstand pwm cycling. If you put a nonwoven lining in a pwm trans it will burn up the clutch lining quickly. A Woven will go the other way, but not needed and is more expensive.

Now, yes you can pull the side cover off in the car, but i think the changes necessary are beyond your ability, AND if you were able to calibrate the valve body for non-pwm ON/OFF function in that car, it may still set a speed ratio code if you do not have it set to apply full ON at 60% duty cycle.
Its a loser man. Put the right trans in there is the only practical reality for you.

sorry,
Dean @ TransLab

Quote:
Originally Posted by wastehog
No problem. That really sucks. What does the pwm do anyways? Doesn't it just lock the TC? And is there anyway you could get a diagram of the 97 Trans wiring? Also, your not thinking pwm as in the Tc timing option are you?
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