[boots4]

The 203 is going to be a hard case to beat for cheap and bulletproof. When I took mine apart to setup the gears are bigger and beefier than the splitcase.

Gears don't need to be as deep with an auto because you get the torque multiplication factor with the t.converter. On average that is good for 1.8 to 2.5 for multiplication. So if you run a 4L60e 1st gear is 3.06, that means you'll have 3.06x2.0(203 doubler)x2.3(tc low rounded up)x4.11(diff ratio)x2.0(lets choose the middle ground for t.converter multiplication)=61.6. You'd have a crawl ratio of 62.

The standard good all around suggestions I found were 60 for autos and 100 for manuals. This is for a variety of trails that would need slow going at times and wheel speed at other times. If you have a torquey engine mated to an auto you won't even need that much.