Join Date: Oct 2007
Location: HellPaso, TX - Fort Bliss
Feedback: 0 reviews
bigger, stronger shafts (bigger, more spline count) is the main part. in some instances, the tubes are thicker and larger, but not always. larger knuckles.
gears usually are not the weak point of an axle/diff. something else usually breaks before ring and pinion blow up. sometimes a diff or R&P will become collateral damage when something else breaks first, though.
with the old D44's, 37's is often pushing it (depending on the driver of course). with the JK Rubicon D44's, 37's are rarely a problem. swap in chrome-moly shafts and do a little gusseting, and the JK Rubicon 44's are practically as strong as a D60.
35's on a D35 can have bad results. D30's can usually survive 35's, with some simple upgrades and a prudent driver.