I use the Redline brand Lightweight Shockproof blue/green colored synthetic gear lube in the blue labeled bottles, not the Super Lightweight red colored in the yellow labeled bottles, in my S/P car with a Mark Williams Dana 60 with 40 spline spool and axles using a set of stock 4.56 Dana pickup used gears, that lube flat works great, 1.24 60 Ft. so far launching off the trans brake at 5800 RPM