OK here is the deal, I have a 91 RS with an open/drum rear. I got a LT1 posi/disk rear but no rotors or calipers. So I found brand new LS1 rear calipers and rotors cheaper than what I can get the LT1s for.

So far I have
91-92 1LE prop valve
LS1 master cylinder
LT1 posi/disk rear
LS1 caliper, rotors, and flex lines

Anyways, I think I have the conversion from drum to disk covered, but not the hard lines that run along the axle tube. Will the LT1 lines work or do I need to find LS1 hard lines?

BTW, I 'm doing this so I can put my ZR1 rims on, I got 2 1/4" spacers/adapters for the fronts

 

You need the LS1 hard lines, backing plates, and axles.

 

Axles????? Really, whats the difference in the axles?

 

Slightly different length would be the biggest thing.