ES_97Sport
Rock Warrior
Reged: 07/19/03
Posts: 551
Loc: Colorado, US
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Re: You out there Nathan C, need advice re dual cases
05/10/12 04:12 PM
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Quote:
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BTW you would believe how much 231's go for over here. Called up one wrecker yesterday, wanted $900!!!.
Hi, Ian.
That's not that far off. A brand new NP231J is $600 and change from Jeep here in the States.
On a side note, have you thought about replacing the Mitsu t-case with an NP242 and then using the '231' doubler? Seems to me it would be a hell of alot simpler and you keep AWD. Unless you have a machanical speedometer, you can use the Jeep 2000s VSS with the Dakota signal converter. My entire assembly isn't much longer than than my stock Mitsu transfer case.
Something to think about ...
For all the work you will need to do, get the most 'bang for your buck' you can. Don't put two sets of the same gears in. This is way to expensive and complicated just to end up with a 2-speed.
You'd be on the right track with 1.92 and 2.72 (5.2:1), but IMHO 1.92 is useless for even mild 'wheeling. All it does is beat the hell out of your vehicle and the heavier the vehicle gets the worse that ratio is. I just came back from a nightmare vacation with a stock Sport with the factory 1.92 and 31"s - I'd forgotten the crap I had to deal with because of that ratio.:(
2.72/2.72 is MUCH better (7.4:1) but you're back to the 2-speed issue.
Can you get Mark's 3.?:1 Mitsu t-case gears? That' would be even better 3ish/2.72 - about perfect for an automatic. But they're going to be pretty expensive.
More expensive but something to consider is a Terra Low231 kit in an NP242 (which can be done, BTW) with a 231 gear reduction box in front. That's 4/2.72. That gives you 2.72 (LO), 4 (LO LO) and 10.88 (LO LO LO). Better would be 3.5:1 (LO LO) for an automatic with something like 4.90 axle gears. 10.88 is serious overkill for an automatic with 5.29s, but I guarantee that once you try it you'll never want anything else. 
What exactly do you do with your vehicle and what are you trying to accomplish?
Edward
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'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 228:1
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 3-link/SAS project
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