Talk to Cass at Doctor Diff. I'm pretty sure the helical is the way to go these days. They are much smoother than a locker and much more reliable than the old clutch pack design. Yes. Call Cass. Avoid the Eaton Detroit Truetrac. They have quality issues with the Chrysler 8-3/4 version. I got one and had to send it back. It had a tremendous amount of side play on one of the output worm gears that engage the axle splines. Many reports on Mopar sites about this problem. The play causes the axle splined end to move side to side, in two dimensions, and therefore the wheel to wobble. People have also reported clunking noises. Robert
AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
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