AW4 Transfercase Options

[MISFIT]

i have a dana 300 behind the AW4 in my manche, but even if i install a 4:1 kit in it, it still won't be enough for 42's. i need lower gearing. i hear the AW4 is the same tranny in automatic toyota mini trucks??? if so, is there any way i can slap in some yota dual cases??? is there any other route to take besides a stack box or atlas??? i've searched but, so far, came up empty. thanks.

[JohnX]

I'm sure its not what you meant....but a V8 would sure lessen the need for gearing.

Short of that....how about some specs on the rig...motor(4.0 I assume), axles, gears, intended use...probably rocks or mud with those meats?

[MISFIT]

I'm sure its not what you meant....but a V8 would sure lessen the need for gearing.

Short of that....how about some specs on the rig...motor(4.0 I assume), axles, gears, intended use...probably rocks or mud with those meats?

no engine swaps, i don't want THAT much down-time for my rig.

it's a '90 MJ. stock 4.0, AW4, Dana 300, GM 44 front, GM 12 bolt rear, 5.38s, 37's blah blah blah.

i like the 4.0 and the auto so i'd like to keep them. i will be using a dana 60 front, and most likely a 14bFF rear and 5.13's/5.38's in them as well. right now, the dana 300, aw4, and 5.38's really don't like pushing the 37's so i'm thinking i'll really need a new t-case or somthing for 42s :D. this will be a strictly rock-driven rig. no mud or water inless i have to cross fordyce or somthing :D

[BrettM]

I think a 4:1 and low diff gears would be pretty good for 42s, that's considerably lower than my 35s, stock t-case, and 4.88s which I like just fine:

2.8*2.72*4.88/35= 1.06
2.8*4*5.38/42= 1.43

If you really must have it lower you have 3 real options, and of course the cheaper it is the harder it is. (1) Stak or Atlas, (2) np231 or 203 doubler or (3) Toyota conversion and dual t-cases

Here is a good thread to read to get you started on researching the Toyota option: http://www.naxja.org/forum/showthread.php?t=23644

[meatplow5150]

Have you thought about a Klune-V? www.klunev.com

[MISFIT]

thanks for the link.

so all i need is the yota tailhousing and output shafts??? hmmmm. i might not need to go to the extreme and put duals in there, but just a yota case and 4.7's ought to be enough. plus ALOT cheaper than an atlas or stak. that's just great. has anyone done this yet???

[BrettM]

you will have to tear down the whole AW4 to swap the output.

how much do you anticipate the output, tailhousing, t-case and gears costing? and you only change the crawl ratio from 60:1 to 70:1 versus doing a 4:1.... the DD Machine Box4rox np231 doubler is cheaper than all that and gets you either 40:1 or 107:1.

I really think 60:1 will be fine with 42s....

[MISFIT]

you will have to tear down the whole AW4 to swap the output.

how much do you anticipate the output, tailhousing, t-case and gears costing? and you only change the crawl ratio from 60:1 to 70:1 versus doing a 4:1.... the DD Machine Box4rox np231 doubler is cheaper than all that and gets you either 40:1 or 107:1.

I really think 60:1 will be fine with 42s....

ok, isee what you're saying. but it would just be cool to have dual yota cases :D. i guess a 4:1 kit and maybe 5.89's will just have to do. thanks.