B&M says their Shift Plus 70380 is for 93 & up 4L60E and 4L80E transmissions. There were no 4L60E's in 91 & 92, so this question pertains to the 91 & 92 4L80's.
My stock 91 trans works fine and does everything it's supposed to do, but the shift firmness is very, very 'comfortable', too much so for my liking.
I would like to use the B&M part to make it shift a bit firmer. The tech line guy was ok, but couldn't really answer Why it wouldn't work for my application.
My PCM and wiring colors are the same as their instructions list for the '93 up transmissions, so there's no issue there.
Any transmission experts out there know if there's a good reason I couldn't use this part in my '91 truck?
Transmission to Rear-end
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