anybody here have done it, how is it working out? what else is needed besides swapping TC wiring, pressure switch? solenoid? kickdown cable?

trans is out of 1993 fbody with 3.23 going to 1990 fbody also with 3.23

im pretty sure forth gens WOT shifts where about 55-5800.. so pretty close to the third gens

will there be any issues with TCC considering that the ecus and valve bodys are different between the two

thanks

 

The TCC wiring is a 5 prong on 93, 4 on 92-down. I'd expect a person could refer to diagrams for both and re-pin to make it work. But why? Unless it's free, just rebuild a thirdgen trans.

 

1993 units have the latest updates as its the last year

more importantly pre 93 fbody 5.7 transmissions are harder to find, valve body and governor must be match to get proper shift points at part and full throttle

having a 700r4 rebuilt from a 5.0 tbi tpi or truck form the 80s will not have the same shift points at part throttle or full throttle as a 5.7 tpi trans or the 1993 fbody trans

all 1993 v8 fbody shifted the same so you know what your gettin when buying a 1993 fbody 40l60 as far a shift points while a 80s 700r will have multiple different valve body/governor configurations

 

What makes you believe that a transmission calibrated to operate behind an LT1 is going to be any better match than any other transmission? I mean unless you're doing an LT1 swap.

You're also putting a lot of faith into blind factors. I'm not sure how many 1993 LT1 cars had auto transmissions, but I'd wager there were more L98 thirdgens by far. Now assuming a person does find a one year only 4th gen trans, and is able to make the required modifications to make it work, what's to say that in the 24 years since it left the factory, that it's never been modified, or rebuilt with whatever parts Joe-Bob's tranny shop had laying around?

Whatever floats your boat, just seems like a longshot to consider being worthwhile.

 

Just do the necessary wiring changes, speedo gear changes, if reluctor wheel equipped, and run it. I wouldn't pass one up if I needed a V8 4L60 unit. The WOT shift points are not "pretty close" to a third gen, they're higher and can be noticed. The choke of a long runner intake is what needs upgraded next, while you're in there.

An untouched '93 unit does not have "all upgrades," whereas a GM SRTA unit from later on, would, aftermarket pieces notwithstanding.

 

actually current engine is lt1 swap am still using stock 3rd gen ecu and running distributor

my current setup



you are correct on the other factors theres noway to know tranys past history, 1993 trany i found is out of a formula with 63k for $550 i know pretty low for age but have seen odometer for myself

i guess it is a leap of faith but i have seen a poster on here stating he has done the swap but he has not logged in since 2015 (thirdgenwill & eagleeyes)

https://www.thirdgen.org/forums/tran...0-vs-92-a.html

i thought there be more other members who have done the swap that would chime in

 

never heard of GM SRTA what is it and what cars had them equipped?

also what are the WOT shift points on the 4th gen all the stock skeleton weighted governed 700r4 ive owned including the current third gen i own in stock form shift between 52-5500 i assumed the 4th gens where pretty close based on these vids

 

SRTA is an acronym for Service Replacement Transmission Assembly.