Tranny interchangeability - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-25-2004, 05:51 PM   #21
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I changed my computer with to one from the olds 98. The same car the tranny is coming from. It worked just fine I just did it out of curiousity for the exact reason you are all talking about. However I used my prom or mem cal or whatever you called it. The 2 computers had the same service #. I was actually rather suprised that it worked.
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Old 12-25-2004, 05:54 PM   #22
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Quote:
Originally Posted by d.denis
I changed my computer with to one from the olds 98. The same car the tranny is coming from. It worked just fine I just did it out of curiousity for the exact reason you are all talking about. However I used my prom or mem cal or whatever you called it. The 2 computers had the same service #. I was actually rather suprised that it worked.
Ya a lot of GM'* are like that...But we're talking about changing to a trans with a different final drive and have a way to change chips or somthing to have the PCM accept it.
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Old 12-25-2004, 05:59 PM   #23
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Quote:
Originally Posted by jr's3800
Its odd to explain the way GM used the PCM'*... But 88-91( Vin C 3800), 92-93, 94-95 computers will swap... But the Programming is important..

My question for you is, Did your transmission come from behind a supercharged 3800?

If not what gear ratio was the trasmission that you got from the 98? 98'* could be NA'd or SC'd...
Mine came from a */C'd Park ave.....94....with a 2.84 I believe....
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Old 12-25-2004, 06:07 PM   #24
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Quote:
Originally Posted by jr's3800
A park Ave with the L27 3800 would have the 2.84 gear ratio... But you must have gotten that trans from a Park Ave Ultra, and it too would have had the 2.97 ratio...

Even the Caddies used the 2.97 Ratio HD trans... Untill the Northstar...lol
I don't think the car I got mine from had the Ultra option though...unless that'* the only way they came with the */C is if it'* an Ultra.
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Old 12-25-2004, 08:06 PM   #25
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Okay, very curious here. I bought a used tranny and just finished installing it last night. It works very well. Shifts smooth, seems to handle the power. Yet, one problem. First, traction control will not work. Second, the rpm it is at at speeds when the torque converter is locked up seems to be a little higher. I was told that this tranny came out of a park avenue ultra and that it would work no problem. One more thing though. When shifting down to first, it seems to let the engine rev wayyyy to long. It will bounce off the rev limiter before after a few times of bouncing go into first. Yet, it doesn't slam into first, it goes just like it should have right away.

Anyone know what the problem could be. It also appears i have plenty of tranny fluid as well. I am very confused at this point as I do not want to have to do that project all over again.
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Old 12-25-2004, 08:09 PM   #26
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You need to verify the axle ratio. And the trans has nothing to do with Traction Control. You have something disconnected, most likely the LF wheel speed sensor (considering what may be in the way or damaged during a trans install).

Did you have your battery disconnected during the work? If not, disconnect it for an hour or so, then let it re-learn. May take some time.
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Old 12-25-2004, 08:14 PM   #27
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I don't think you got a good trans or something....or maybe there'* something about this trans that your PCM isn't feelin too happy about....I have a 95 SSEi and I bought a used trans from a 94 Park Ave Ultra */C'd and I haven't had one problem with it yet.
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Old 12-26-2004, 01:59 PM   #28
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It is not when it accelerates when in first. It happens when I give it enough gas at say 25 for it to downshift to first. I am thinking that the PCM has not learned the new tranny or something. Also, I made sure I installed the speed sensor. I will check it out again, maybe it got disconnected somehow. Yes, I did have the battery disconnected throughout the whole install as well.
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Old 12-26-2004, 02:08 PM   #29
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If your HUD works, your VSS works.

Try removing the Jet and see if the problem remains, but only if the problem doesn't go away as the PCM/Jet learns.
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Old 12-26-2004, 02:59 PM   #30
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Quote:
Originally Posted by LakevilleSSEi
Quote:
Originally Posted by 1993 SLE
you are right. I believe that most/all NA cars have the 3.06, there are exceptions but for arguments sake NA=3.06. Now the SSEi with the HD version has the 2.84. I know for a fact that Buicks and Olds have different trans options, I believe that the buick and the olds have a option for a 2.84 and a 3.33 ratio on a NA application
Different options how??? My trans I just put in this year came out of a Park Ave? Works just fine?

Will: If you put in a trans with the wrong final drive ratio, the trans won't shift cvorrectly because of the PCM???? Correct??

Now would you be able to Swap PCM'* or chips or whatever from the same vehicle that you got the different tranny from, would it shift correctly and work? Or be a waste of time?

Was it the Park Av Ultra?
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