4L60E interchange
The truck unit will have a deeper pan as well.
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I have a '92 silverado and used parts off a 2000 silverado (1999 build date) it was the '88 up body style. My truck is not a small block but I have seen a 2000 silverado with a gen 1 vortec engine.
Basically all you need to do is either find out what engine it had, or just look at the trans, if the input shaft has splines up to the end with no pilot, it will work, if it has 8 bellhousing bolts it will work. You will need to change out the tailhousing. And as already mentioned the servo and accumulator set up might be different and give it a different shift feel.







