Transfer case options

[cmhaah06]

I know our t-cases are fairly stout, but I was wondering if there were any other options out there other than buying a atlas t-case. My buddy just finished building a Suzuki samurai and used a Toyota doubler with a extra low after market gear set. Front t-case is 2.7 the rear t-case is 4.7. His final crawl ratio is 223:1. This got me thinking if there were any other options to do a similar setup. Would it be possible to adapt Toyota boxes into the ex? I have heard of someone on this site talking about using a 205/203 setup. Does anybody know if this was ever done? That would be heavy/big as heck but similar, no.

 

[MrShorty]

The ones I've heard of in Ranger Based Vehicles (RBV's) use a BW13-50 from an '80's Ranger/BII for the doubler. I think it was documented over at therangerstation. I don't remember if anyone here has done that or not.

 

[cmhaah06]

I've read the how to on the doubler for the rbv's. I want more info on other options. Something I can put a lower gearset into to get an even lower crawl ratio with. A setup similar to my buddies rig. He dropped a 4.7:1 gearset in the second t-case. He has 5.38's in the pumpkins, 2.27 in the front t-case and 4.7 in the rear case. Im looking for a setup similar to this.

 

[4x4junkie]

I doubt anything above 120:1 or so would be of much benefit with the 4.0L engine (a Samurai needs all the gearing it can get with the little 1.3L 4-popper).

I'm at 117:1 with the smaller 2.9L and it's almost perfect (it'll usually idle up stuff to the point of the tires slipping without me touching the throttle, leaving me able to work the clutch & brake together when needed).

I guess if you were really ambitious, you could build a "tripler" using two stacked 1350s ahead of your stock t-case, but I suspect mostly what you'd get out of it is just bragging rights for lowest gear (would get you 266:1 if you have 5.13s in your axles).

 

[cmhaah06]

Ok. 266:1 sounds awesome. Well, I think a doubler would mean less money invested and more time offroad. Will be getting a doubler soon. Just wanted to know if there was anything else out there.

Hmmm...could you make a doubler for a atlas? Just thinking out loud.

 

[Happy Jack]

I remember reading somewhere folks where gonna see if Duffy would make a 1350 doubler kit that would connect to a heep t-case. And they make lower gear sets for the heep t-case.

Another option would be to use an early bronco c-4 output. Klune V makes a lower geared low range and there are lower gears sets for the Early Bronco dana 20 t-case.

 

[4x4junkie]

Hmmm...could you make a doubler for a atlas? Just thinking out loud.

Certainly can. Though that would be a lot of weight hanging off the back of your tranny.

I'd use the Bronco D20 if you want something to stick a lower gearset in (or for front digs), though I don't know offhand what a D20's input spline is (if less than 31 (and I suspect it is), I still wouldn't trust it with the doubler in low and the rear case in high).

 

[cmhaah06]

I thought you weren't supposed to engage the rear case/or doubler at all when the front case was in four high?

 

[4x4junkie]

The reason that you don't do that is that it puts HUGE stress on the intermediate coupling shaft between the two units.

However if you have something much bigger than stock in there (say something with 35 splines, which you can order an Atlas with a 35 spline input), then there would be no worries running the box in Lo with the case in 4-Hi.