'00+ Trans work in a '99? - 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 03-03-2014, 04:32 AM   #1
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Default '00+ Trans work in a '99?

I don't know if this has been answered yet, but I have a new 4T65E 2000+ refurbished Transmission on a crate and it will undoubtedly fit in my mom'* 2003 Buick Century (M15). I also have the same code and trans type, but will the transmission bolt up to my car, 1999 Pontiac Bonneville?
A mechanic said that bolt pattern doesn't line up but I also read that the torque convertor bolts don't line up, and the mechanic didn't mention exactly what. so what makes it incompatible? I am wondering what will make that 4T65E transmission for 00+ vehicles bolt into my car which is like 97, 98,99 vehicles, nonsupercharged of course.
Thanks for your input, will save me lots in getting a new tranny
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Old 03-03-2014, 06:40 AM   #2
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I don't know where the mechanic is getting his info from, but if its a 3800 Series 2. The bolt pattern is the same from 1995-2005. And usually, the flexplate is different between the L67 and L36. Just keep both of your parts and match them up.
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Old 03-04-2015, 07:16 PM   #3
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this transmission is for NA motors, so it is not the HD version. I am still wondering if the transmissions from 2000+ vehicles will fit my 1999 Bonneville, or any pre-2000. like i said, the mechanic said it doesn't line up so I had to order one that does. what is the difference between the years of these transmissions and is there a way or adapter for them to work? Please help if or why these are or aren't compatible and also, does the body type matter? like between H and W and whatever a monte carlo is and buick century. also, same similar engines could they fit in older vehicles?
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Old 03-05-2015, 04:52 AM   #4
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The transmission will bolt up fine but the two things that need to be checked for compatiblaty are if the replacement transmission has a internal neutral safety switch and if the replacement transmission has the same final drive. The 4t65e had four different final driver ratios.
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Old 03-05-2015, 06:34 AM   #5
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This link will help decipher what year and what ratio your transmissions are.
GM FWD Transmission ID charts
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