Tranny interchangeability - Page 2 - 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 12-23-2004, 11:53 PM   #11
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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
Well I was close.....In some respect
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Old 12-24-2004, 11:22 PM   #12
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Yup.

If you use a non-sc trans, your final drive will be messed up, with shifts at the wrong points, and you WILL frag your differential. Only a matter of time. The L67 produces far too much torque for that steep final drive gearing in the standard 4T60.
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Old 12-25-2004, 11:06 AM   #13
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yes a interesting video that would be

"death of a 4T60-E"

that has a good ring to it
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Old 12-25-2004, 03:03 PM   #14
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Anyone remember SSEi95'* fragged diff? And that was an HD. Mine may have a hole in it right now. Haven't had time to look.
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Old 12-25-2004, 03:18 PM   #15
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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?
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Old 12-25-2004, 03:20 PM   #16
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The Buicks and the Olds are just geared different than the Bonnevilles
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Old 12-25-2004, 03:24 PM   #17
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Quote:
Originally Posted by willwren
Anyone remember SSEi95'* fragged diff? And that was an HD. Mine may have a hole in it right now. Haven't had time to look.
I had the same prob....How I got my baby for free!
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Old 12-25-2004, 03:41 PM   #18
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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?
How is a non-sc PCM going to handle boost?
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Old 12-25-2004, 03:43 PM   #19
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Quote:
Originally Posted by willwren
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?
Touché

How is a non-sc PCM going to handle boost?
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Old 12-25-2004, 05:32 PM   #20
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by willwren
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?

How is a non-sc PCM going to handle boost?
Agreed, how will it deal with the boost solenoid control, and fuel tables as well as shift points...

Another point here.... All 3800 SC bonnevilles 1992-1996 had the 4T60-E HD with the 2.97 ratio... There is no 2.84, 3.06, 3.33 or 3.47 for the HD unit... Thats not to say you couldn't change the cain drive sprokets and get the desired gear ratio... But again how would the PCM deal with it...

On a diffrent note.... When I replaced my factory chip, they took the Vin # from my car and somehow got me the wrong chip... It was for a 1995 buick as opposed the my 1995 pontiac... Ran like totall ***^ and shifted for crapp, no lockup either... The variation in programming from the 1995 buick to the 1995 pontiac caused so not so good driveability issues for me and the chip had to be returned, they did not refund my credit card and I disputed the charges... I got my money back.... Finall found a good dealership and got the correct chip for my cars engine, tranny setup... Hmmm thats enough Bla Bla Bla from me..
What would the possibilites be of maybe getting a chip burned for something like this???

I know it'll probably be slim to none....I think I'm out of ?'* now
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