Jeff to anwser your question theres a multitude of engines you can put in depending on your skill level and what your trying to achive if your looking to make it into a little sport truck why not say drop a small block 350 in it there cheap to build easy to come by and the clearence issues are not to much to over come you will have to swap out the old motor mounts and you wont have any issue with it bolting right up to your 700r4 it takes some work on the over all but i found it to be most satisfying in the long run
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All of the ones listed and 98 will work too. The transfer case comes off the end of the tranny and the tailshft housing comes off the two wheel drive tranny and the transfer case bolts right on, So all the two wheel drive trannys will work too. 97 and 98. Others will work too but you can't just plug them righ in as some of the sensers and switches are different. The junkyard that your dealing with if their any good will tell more that'll work than this and the changes that'll make even more trannys fit.
It should be a plug and play if your using the ECM for the 1994 engine. The ECM on the 1996 S10 will no work on the LT1 engine, for one thing the S10 ECM will only command for 6 fuel injectors and will have different injection pulse and so on. The program of the S10 ECM is made for the Vortec as to the LT1 will have different parameter **** as engine running temperature, vacuum readings, and timing.
The most obvious would be the 1994 LT1 runs on a OBDI system and the 1996 is running on a OBDII system. You can still run the 1994 LT1 from a 1994 with a OBDii system ecm, but some of the sensors will need to be upgraded to accommodate for the proper readings the OBDII system will need to have the engine to run right.
If you don't have the right ECM for the LT1, go to the wrecker's and locate one, Caprice, Camero, Firebird ECT.....
Thank you for using fixya and good luck on your project.
If you live in a state with smog license requirements your wasting your time, the engine has to meet EPA requirements for the year vehicle was manufactured your car is considered a clunker good luck getting it smogged. And it is no big deal to change. 350 is almost identical to 4.3 just some variations.
So your current transmission is a 4L60E. t is a very strong automatic. You can also convert to a 5 speed or utilize the 700R4 automatic that is non electronic. Hope this helps narrow your search. Please rate me highly. Thanks; Rich RPM Northwest