Hmmm, you'll be revving pretty hard.
If everything else is stock, 4093 RPM @ 100kph.
That's pretty high for a 1.3 to only end up with 42:1 crawl.
That's the problem with 5.12s- they're not ideal for either solution.
For reference from my setup:
- my car is at 3322rpm at 100kph with 107:1 crawl- 4.1's in the diffs, TT 6.4:1, 34" swampers.
That's a bit low for my 660 to spin with load on board, as it's below peak torque.
I will be going to 5.12's, which with Q78's (full 35" tall) will give me 4020 in 5th @ 100, but that's fine for a 660.... and 134:1 crawl - way too much, but it should be plenty fun.
Bear in mind, I'll be at 2000 rpm at 40 kph in HIGH 4TH... which isn't much taller than a stock sierra high range

so off road high range will be plenty useful.
didn't intend this to be all about me, just pointing out that you need options and I don't think that 5.12's really give you options until you have very tall tyres and transfer gears.
Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]