I wanted to know if i could use a 4l60e from a ls1 in my 94 lt1.Would i have to change parts because its from a ls1?

 

Won't fit, as the bellhousing bolts are different.

 

Questions like this are handled in the "Drivetrain" forum. I'll move it there for you.

 

lt1 trans will go into a ls1 with a tci flywheel(dual bolt patterns) and a sleeve for the converter snout

ls1 into a lt1 wont because of the converter snout being too big...you could have it turned down and possibly it would work with a lt1 dual bolt pattern flywheel

btw swapping the lt1 trans behind a ls1 requires swapping the shift and lockup noids from a ls1 trans...