durango_60 said:
So are you suggesting that a JKU w/ D44, rear locker, 2.73:1 case, 4.10's, 2" lift and 33's might be a better solution for the type of wheeling most folks on this site pursue? I imagine with a rig like that you could handle the same terrain the folks with expedition built Tacos or Cruisers will be tackling.
i'd say less expensive, not really better. in 4-hi, 1st gear still yields 18:1 with 4.10's in the differentials. With the Rubi's limited slip, there's a fair amount of terrain I can tackle in 4-hi with true 3 wheel drive. With a Sahara packed with a rear detroit, it's be about the same for most "overland" type trips. I don't think you'd really miss the extra equipment of the Rubi.
Assuming both rigs have 4.10 diffs and the GS370 6-speed, here's the final drive ratio for 4-hi, and then lo-range for the NP231 (standard) and NP241OR (rubicon).
4-hi | NP231 | NP241OR
trans | 2.72 | 4:1
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1st | 4.46 | 18.286 | 49.74 | 73.14
2nd | 2.61 | 10.701 | 29.11 | 42.80
3rd | 1.72 | 7.052 | 19.18 | 28.21
4th | 1.25 | 5.125 | 13.94 | 20.50
5th | 1 | 4.1 | 11.15 | 16.40
6th | 0.84 | 3.444 | 9.37 | 13.78
R | 4.06 | 16.646 | 45.28 | 66.58
Based off these numbers, I can see that the majority of trails I've been where the 2.72 lo-range wouldn't really be a liability, because it is rare that I drop into 1st gear. I'm usually in 2nd, 3rd, and 4th and then will shift over to 6th for basically double-tracks in the dirt, and back to hi-range on gravel roads.
Where the deeper 1st gear comes in handy is in rock crawling, where the extra control and slower speed of 73:1 is a real asset over the "bump and throttle" technique in tackling obstacles.
edit: more nerd stuff: if you take out 1st gear of the rubi and just compare it with 2nd gear and on, you can see that 2nd-6th is nearly identical in final drive ratio to 1st-5th of the NP231's 2.72:1 lo-range.
231 241OR
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49 42
29 28
19 20
11 16
9 14