Suzukis used to have nearly twice the low range of either Jeeps or rovers
the LJ80 had a 2:1 High range
and a 3.15:1 low range
with 4.56 axles stock
Jeeps of the same era had only 2.62 low range and 3.55 axle ratio's (if lucky....they also came with 2.72's in the AMC 20's)
The modern suzuki SJ transfercases can be easily upgraded to 4.16 low range and 1.4 hi range with aftermarket gears (up to 6:1 low range is available)
You could also check out the website in my Sig. for some other (stronger) options.