how to get to 4:1 ?

[insufficient funds]

Basically I want to be down to 4:1 IM running stock transmission and transfer case. 4.10 in my dana 30 and ford 8.8 What steps should I take to do this. I know alot of guys run Dana 300. I want to do this cheap as possible. Not afraid of junkyards and doing some searching. how do I get started? Keep mine I know it can't be done dirt cheap but IM strapped for cash.

 

[Bounty__Hunter]

Why do you want 4:1? Seems to me you're geared way too tall for the 2.5L 5spd and 36" tires. Lower axle gears will help you on-road and off, not just off-road as the 4:1 will do.

I run 5.38 axle gears and it seems about right for the 2.5L 5spd and 36" tires.

 

[insufficient funds]

Mostly want to make a crawl box for rocks and bigger obstacles. the Jeep is mainly off road not a daily driver and gets trailered to the trails.

 

[Bounty__Hunter]

Makes sense. Keep in mind that you will significantly increase the amount of torque sent to the weaker front axle, so this upgrade will definitely have a domino effect.

Check into a 231/231 doubler kit, and move the 2.5L forward to accommodate the extra length.

 

[Utah_jeepster]

I do believe a Tera-Flex 4:1 is only 1100$ .

 

[insufficient funds]

Yes the Dana 30 is next to go.

 

[Gennybro]

I'm trying to get a full understanding of this gear ratio. Now on a 4;10 would that mean for every 4 reveloutions of the drive shaft the wheels make 10 revoulutions. with a 4;1 it's 1 reveloution of the wheel for every 4 of the drive shaft. That's how I'm thinking it works, just want to clarify,sometimes the ole brain thinks a$$ backwards.

 

[69jeepcj]

with a 4.10 gear, your drive shaft would spin "roughly" 4.10 times per one tire revolution. A 4.1 gear set in the tcase would mutiply that by 4.

A 1.1 would be one driveshaft revolution to one wheel revolution.

 

[insufficient funds]

What about a Dana 300 Or maybe an atlas With a teralow kit in it? Anyone running this set up ? I herd the planetary gears are pretty stout.

 

[Bounty__Hunter]

What about a Dana 300 Or maybe an atlas With a teralow kit in it? Anyone running this set up ? I herd the planetary gears are pretty stout.

The d300 in stock trim is no lower than your stock t-case, and the front output is on the wrong side. You can run a flip kit and deal with a small amount of leakage out the shift rails, then install a 4:1 kit inside the d300.

You can not put a teralow 'into' an Atlas. The TeraLow is a product sold by TeraFlex that replaces the front half of the 231 transfer case with a 4:1 unit. An Atlas transfer case is completely different and available in many different reduction ratios.

 

[Utah_jeepster]

A tera 4:1 kit replaces the planetary gears in your stock transfer case to a new 6 planetary set. Increasing its strength and reducing your low to 4:1.

An Atals transfer case replaces your factory NP231 transfer case to their custom case. You can order the case with 3:1,4:1,5:1 and even 5.5:1. With an atlas you will need to do an 1 in body lift and have your driveshafts resized.

 

[Jeeper4ever]

Swap in a Rubicon transfer case.

 

[Bounty__Hunter]

Swap in a Rubicon transfer case.

Not really possible without an engine/transmission swap. The Rubi case will not bolt up to the 2.5L transmissions.

 

[Utah_jeepster]

Correct me if I am wrong Bounty, the NP241 is a 23 spline and the NP231 is a 21 spline.

 

[insufficient funds]

What's the difference in the rubi tcase?

 

[Jeeper4ever]

NV241 is 23 spline

 

[insufficient funds]

Is it still chain driven?

 

[Jeeper4ever]

Not really possible without an engine/transmission swap. The Rubi case will not bolt up to the 2.5L transmissions.

My bad. I couldn't see his specs on my phone.

 

[Jeeper4ever]

Is it still chain driven?

Yes but it's 4:1

 

[Utah_jeepster]

You can order a 23 to 21 adaptor shaft from advanced, so a 241 can bolt in where a 231 sat