...uhhhh, usually you would express the final crawl ratio as:
1st gear ratio x tcase low x diff ratio...

(Not trying to sound toooo nit-picky here.)

With a M/T, 50:1 is good, and >100:1 is fantastic, with an A/T 35:1 is good, an >80:1 is fantastic.


So the basic Gen1 A/T = 2.826 x 1.944 x 4.625 = 25.4:1, which is nothing too special.
Hence the usefullness of the 3.15 tcase gears = 2.826 x 3.15 x 4.625 = 41.2:1

On the 4.3 swap with GM A/T and tcase and Mitsu diffs = 3.060 x 2.72 x 4.625 = 38.5:1
The GM tcase can get a 4.0:1 swapped in from TerraLow, and then give me 3.060 x 4.0 x 4.625 = 56.6:1, which starts to get pretty serious crawl.

Adding a 2nd tcase/or crawl box or KluneV underdrive (if you got room) would multiply everything up by those extra gears, which are usually 2.7:1 or 4.0:1, which gets you into the truly excellent crawl ratios!
So my "dream" system would be a 2.7:1 KluneV added to my existing 2.72:1 GM tcase which would give 3.060 x 2.72 x 2.7 x 4.652 = 103.9:1, which would give me a truly excellent final crawl ratio...
But I doubt I'd ever need it.

But fun to do the math, though!
Oddly enough, I've yet to see anyone correct for tire size, though. And that also comes into play here...