im trying to help a friend figure out if she can use a reg. th350/400 converter and flywheel on her ls-1 backed by a th-400.what convererters must she use,the ls-1 converters or the th-400?and what flywheel should she get?im not looking for opinions on stall speed, just what will phisicaly bolt up.thanks alot! im a lt-1 guy, and know very little about the ls-1,so thanks in advance for helping us out with this one!

 

all you need is the hughes crank spacer or the gm spacer-with longer bolts-

no special parts other than that are needed, it is a very simple swap