Originally Posted by Doug
I've driven Chammy at 80 mph on hard salt flats in NV, locked up. Never an issue. Also drifted her through dozens of graded turns, on hard sand to loose gravel in the deep badlands, locked.
Yea, lot's of loose gravel and other unpaved surfaces around here; I drive with diffs locked at speeds way over 20 mph. Makes drifting through those loose gravel turns @ 45 MPH alot more controllable.
The main thing to keep in mind with the diff lock it that in a turn, the rear wheels travel in smaller-radius paths than do the fronts. So an open diff is needed between the front and rear axles on hard pavement, to allow the rear axle to spin slower than the front. On loose surfaces, you're better off with the axles locked at the same speed.