I don't have firsthand experience of the Detroit units
@marjon, but I do have Ashcroft's own-brand units in my axles and transfer box. These were put in in the autumn of 2014 (axles) and at Christmas at the end of 2015 (centre). I've written about them elsewhere. They've been in the axles for just over eight years and have been pretty much a fit and forget experience, though I have changed oil occasionally. No noise, no adjustment needed, nothing. In this winter's snow and ice in Wales I've been very pleased with them. I've just sailed up slopes effortlessly, far beyond the tyre marks of other vehicles that have zig-zagged all over the road and given up. I don't really have a 'technique' as such, just to try to keep the vehicle moving, in the highest gear in which it will do so. I have a non-ABS model so often need to pump the pedal to stop it. It seems to work, because I haven't hit anything yet. The only time it wouldn't go was on a slope of freshly dug clay on which it had been raining all day, and I hitched myself to a conveniently positioned
@Remora107. It was just so slick none of the wheels were gripping. Oh, and I embedded it in a swamp on my smallholding once when taking tools and parts to my stranded digger, but that was because the wheels had sunk right in and it was resting on the axles. Fortunately I pulled it out easily with a dumper truck. But aside from these very specific circumstances, it's fine for snow driving and farm tracks.