if the shaft is the same length, diameter and such then u should be able to swap the case extension. if not u will have to change the output shaft at the least. i cant tell u if they are in fact interchangeable. if u get nothing here call or stop by a local wrecking yard. they should know the compatibility of the two.

 

you guys are so helpfull... im gunna purchase it tommarrow... and we shall see how this works out.. i thought all chevy rear wheel drive 4l60e's where the same..

 

It's not going to work, not without a bit of ****in around. There are some important differences between the years.
Read this, and the following page. http://www.hotrod.com/techarticles/1...ion/4l60e.html

 

i was hopin someone would chime in on this one. thanks.

 

Those headers look very nice off topic, NSANY, are you invested in them?