67 FJ40....SOA, no cut and turn standard d-shaft. No shackle reversal It has the front springs flipped, 350/SM420 conversion. I'm putting the front d-shaft in as since the conversion, the exhaust has been in the way (ramhorns/ypipe going in this weekend) The front driveshaft is REALLY close to the right size, i just wonder how much slip/travel will I need. Obviously I don't want it to destroy the t-case, or pull apart. Rough estimates: ~29 1/4" flange to flange pinion-t-case at that length, the driveshaft has around 3/4" ~ 1" before it's fully compressed. (will get better measurements once I can place the shaft up there.) How much travel should I allow for? If I"m going to shorten...how much slip does that shaft need to have available?