Is an LSD Necessary for a build like mine? Also, idk if the trans has carbon synchros already, I think ill inquiry about that before the purchase. If they are not, how should I approach this issue considering my situation with rebuilding? Are there any cheaper LSD's on the market those good recommendations?If $695 for a reman trans is too much, then you shouldn't be trying for 400 whp. Add a MFactory Torsen LSD for $700 retail and you'd have a trans ready for 400 whp, but I'd upgrade to carbon synchros while in there as well, another $200 retail.