ok, so i got a 21 spline t-case, 35's, 5.29's and im lookin to go lower. a lot of companies are marketing 4.7:1 t-case gears as well as 5.0:1. the 5.29's i have didnt really gear it that low because of the tire size and i was wandering if anybody knew what a good t-case ratio to use or even a better way to gear down. im on a bit of a budget so im not lookin to spend to much. any ideas? thanks

 

either 4.7's

or

dual cases

 

Do dual cases now and regear to 4.7s later.
I just did duals on mine

 

What kind of wheeling do you do?

Personally, I would go stock dual cases, that would give you 2.28:1 low and 5.2:1 low.

 

i do alot of rocks and some pretty serious trails. i'll check into dual cases. if they are much more expensive ill have to save up. thanks for the info

 

Price is about the same, maybe a touch more with the driveshafts, but A TON more flexible offroad. Just about everyone I know who has had just a 4.7 case wishes they had done duals to start with. Single 4.7 is just too low for easy trails and between obstacles.

 

good to know. thanks. it does make alot of sense to just go straight to dual tcases. maybe a few more weeks of saving is all.

 

Definitely do some more research before deciding to go with duals. Duals are much more flexible and convenient on the trail, but setting up duals is considerably more work. Setting up duals involves new drivelines, new crossmember, body work to the inside of your cab, dual adapter, and an extra t-case (might need other things that I'm forgetting too). Setting up a single 4.7 case only requires a new gear set. Do some searching, there are a lot of good threads on this subject.

 

i was thinking of using marlin's crawler box. its a bolt in replacement for a tcase and they say you dont have to change your crossmember. supposedly its pretty simple except for changing drive lines. any thoughts? im not looking to do a major project, id really like to do some serious wheelin' soon so id like my rig out of the shop. thanks

 

Dual cases are easy to set up yourself. I set mine up in an afternoon and installed them the next day

 

what did you do with your crossmember? i know you can buy them but i aint ordering my rig out of a catalog, i like building on it.

 

4.7's are pretty extreme for your average wheeling, but if you do "alot of rocks and some pretty serious trails" then youll enjoy it. with 5.29 R&P and 4.7TC gears i think your crawl ratio is around 65:1. might be off only because i forget the first gear tranny ratio.

 

I used the trail gear crossmember. But building your own is always and option too. Check out 4xinnovations.com too

 

You can use the stock crossmember with dual cases, but with the additional torque, having another tranny mount is a good idea (would be with 4.7's too, but you can't).

Plus, the aftermarket plate style crossmembers will gain you some ground clearance.

The other option would be something like the Front Range Offroad crossmember.

 

ok i have the same questions on the gearing of my 4runner i just made some trades and got me some 19.5-44-15 boggers and dont know what ratio i wanna go with not that inthused with the marlin crawler it works great but cant get enuf tire spin in mud looking twards the trail gear t-case gears and go with the single case and 5.29 r&p and ideas????

 

you need more power, not lower gears. lower gears will make you tire spin slower at any given RPM.

 

You absolutely need dual cases.

4.7 will not provide much, if any, wheelspeed for mud.

It was funny when I live in Ohio watching the Jeep Rubicons get mired down in the mud (or revving to hell and beating the crap out of their rigs) with their 4:1 tcases, while those of us with 2.28:1 had no issues ...

That said, you will likely need more power (and that leads to stronger axles, etc) to happily spin 44's in mud.

 

I need some help on deciding which direction to go on the gearing problem I have...I just put new 35" MTZ's on my '84 4runner and want to stay with the 4.11 diff. gears but would like to of course be lower geared. Can I go with the dual t-case set up and not change both ring & pinions or is it a must ?
Thanks

 

Nice bump on an old thread!

Changing the T case gears will ONLY change the low range ratio. High still remains at 1:1.

So if you want more power on the street, youll want to re gear the diffs. If your looking for a lower crawl ratio, youll want to re gear the transfer case or go duals.

 

35s on 4.11s will make you hate your truck fast. Trucks with stock R&P ratios have their tongues hanging out driving around on 33s.
If it's a daily driven rig, do the diff gears. Lower t-case gears are great on the trails, but can only do so much for you if your diffs are too short.