Can I use a 4T60-E from a 1995 Oldsmobile Eighty Eight in a 1996 Oldsmobile Eighty Eight?

[1996 Oldsmobile]

Hello everyone, I could use your help please.

TLDR: Will a 4T60-E from a 1995 Oldsmobile Eighty Eight function properly in a 1996 Oldsmobile Eighty Eight (same RPO codes (M13/F17), both are 2.84 FDR)? And is it correct that I should remove the wiring harness from the replacement transmission (the 1995) and use the wiring harness from my original transmission (the 1996 Oldsmobile Eighty Eight’s transmission wiring harness)?

So far I have a new OEM radiator, a new OEM radiator cap, new OEM coolant hoses, twenty gallons of distilled water, three gallons of Havoline Dex-Cool coolant, new OEM thermostat, new OEM transmission cooler lines, new OEM axle seals, sixteen quarts of AMSOIL ATF, and the used 1995 replacement transmission itself.

My question is in regards to the interchangeability of a 1995 4T60-E to a 1996 4T60-E. It seems that it will work, as long as I remove the “trans harness” from the 1995 4T60-E and put the “trans harness” from my broken 1996 4T60-E transmission in place of it. However, I’ve found conflicting info and I could use your advice - I just want to double-check to make sure that I’m not making a mistake.

I have found many examples of people using the 1996-1998 4T60-E’s in older (1993-1995) vehicles, but I can’t find anyone who used an OBD 1.5 (?1994?-1995) 4T60-E in an OBD II vehicle. I’m really hoping it will work, as I really have no other option at this point.

I purchased the 1995 4T60-E because it was the only one that I could find with under 180,000 miles anywhere. This one has only 83,257 miles on it, but it’s from a 1995 Oldsmobile Eighty Eight. My car is a 1996 Oldsmobile Eighty Eight. Same exact FDR (2.84) and RPO codes – M13/F17. I understand there may be a slight 2-3MPH difference in my speedometer after the swap, which is perfectly fine with me. I just want to make sure that everything else will function as intended, and that my logic is correct in removing the “trans harness” from the replacement 1995 4T60-E and using the “trans harness” from my original 1996 4T60-E transmission. The salvage yard’s software did not show this as a compatible interchange, and that’s why I’m worried - but from everything I read online, it seems it will work fine. I know the interchangeability lists on the junkyard’s software can be a bit overly specific at times. I really appreciate your help.

Thank you,




\/\/\/ People who said yes (similar scenarios with 4T60-E's) \/\/\/
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https://www.gmforum.com/buick-172/4t...d-help-297210/

Post #7

"FWIW, I have successfully put a 97 4T60 into a 93 LeSabre. The only things that had to be done was swapping the wiring harness. The 93 needed the 93 harness."
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https://www.a-body.net/forums/archiv...hp/t-3595.html
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http://www.automotiveforums.com/t916...bdii_obdi.html
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https://www.beretta.net/forum/viewtopic.php?t=24413

Post #3

“94-96 4t60e's are interchangeable... Only difference is a small change in ratio that does not affect the ECU or shifting.”
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http://www.pontiacbonnevilleclub.com...opic16430.html

Post #10

“A 1996 Trans should work fine for him.. the 1994-95 PCM is not smart enough to notice a difference...”
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\/\/\/ People who said no \/\/\/
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http://www.60degreev6.com/vb5/forum/...project-thread

Post #1

“One thing people don't tell you about the '96 cars is that lots and lots of parts are one-year-only on them, including the transmission.”
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https://www.gmforum.com/1992-1999-91...eville-220622/
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Post #2

http://www.pontiacbonnevilleclub.com...ost461509.html

“No, 95 is a one year only transmission unfortunately.”
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Some of these links are to cars that aren’t powered by the 3800 engine, but they still mention interchangeability of 1995-1996 4T60-E’s in the threads, so I included them for reference.
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Thank you!