I just installed my LT1 this weekend. Let me tell the backstory. I had a 2.8 with a T5 in my 89 RS. I took it out and now have an LT1 with a 460Le (I think that's the correct name) automatic. Both engine and transmission are from a 95 Trans Am. I noticed that my transmission crossmember is different between the two transmissions. On my T5 the upper portion of the crossmember (don't know the name, it goes between the one that bolts to the frame and the actual transmission) was bolted to the transmission, the two bolt shafts were built into the transmission. On my automatic, that is not the case, so the upper portion is only held onto the bottom portion by one bolt in the transmission. There are those rubber bushings that are pads inbetween the two with holes in the middle, and am wondering if bolts go in there to secure this to the actual crossmember or what? Also I have my v6 driveshaft and torque arm that was with the T5, and was wondering if I can reuse these or if I have to get a different one?

 

the standard V8 crossmember doesnt have all that extra junk your v6 one does, its just the bottom peice with a bolt hole in the center for the mount
but i know nothing about swapping in that transmission, i do know a t56 requires fabrication or a custom cross member, so i wouldnt be suprised if that did to

 

FYI its a 4l60e (4speed auto)

Try a search i have seen a few threads about people dropping 4l60's in their cars but cant reacall exactly what they used for a crossmember. Some tubular x-member rings a bell though...