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Posted

I have a 91 cutlass supreme International... Im needing a tranny.. BUT how do I know if its the 4T60 or the 4t60e? I know its a 4 speed with the 3.1 engine. Also if anyone has a good tranny thats relatively close to OKC.. Let me know..

Posted

Along the passengers side on the back of the tranny is a plate held on by a clip, it's a bitch to get to but it has numbers that you can cross reference to tell exactly what it is and what gear ratio and all. This is the coolest 4TXX tranny I.D. resource I've ever seen: http://www.gmtuners.com/transmission/

Posted

in 1991 the 4t60e was only available with the 3.4 DOHC in w-bodys.

Posted

yeah, for W applications, only the LQ1 had it for 91-92. 93, the 3.8, 3.1 and 3100 got them.

 

also, the early W 4T60E were oddballs compared to everything else that got them... the rest all started off with TCC PWM, 4 circuit PRNDL decoder, etc.... everything that took a few years to make it to the W platform models.

Posted

here's a quick pictoral guide of the transmission connectors:

 

3T40

y9C7tyV.png

 

4T60

fMxLLTG.png

 

4T60E

VSk4svr.png

Posted

1991 3.1 is without a doubt a 4t60 non E. just look at the Trans pan, it should be stamped very large, can't miss it.

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