Gearing Questions.

DontTouchIt · 07-09-2012, 01:08 AM

I am currently running 4.10s with 35s. I have a 4.0 with a good intake, header and a free flowing exhaust. Also have a 5 speed trans. I have been looking around at other forums and seeing that most people are saying that 4.88 is a good ratio for 35s, even using it on the freeway. with my current setup I am able to tach about 1500 at 70 and get around 16-19 mpg. Will running 4.56 hurt me much or just give me more responsive throttle?? I am also planning on adding a bit of cage and fullsize spare W/ swing out carrier. Thanks

**Poke** · 07-09-2012, 06:25 AM

Quote:

Originally Posted by DontTouchIt

I am currently running 4.10s with 35s. I have a 4.0 with a good intake, header and a free flowing exhaust. Also have a 5 speed trans. I have been looking around at other forums and seeing that most people are saying that 4.88 is a good ratio for 35s, even using it on the freeway. with my current setup I am able to tach about 1500 at 70 and get around 16-19 mpg. Will running 4.56 hurt me much or just give me more responsive throttle?? I am also planning on adding a bit of cage and fullsize spare W/ swing out carrier. Thanks

4.56 should be good for you. I ran 35's with 4.10's. It was OK but 4.56 would have been better.

**mrmark** · 07-09-2012, 07:37 AM

4.56's is an expensive change for the difference you are going to get.

I have a 2.5 and 4.88's on 35's and it's a struggle to hit 60, but the 4.0 is a much stronger engine. I just can't see spending the money and not going all the way is all. How fast do you want your top end to be?

DontTouchIt · 07-09-2012, 08:44 AM

Well the only reason that I am asking about regearing is because I have a hp dana 44 I am going to narrow and it needs to be regeared and locked. I figured it would only run me about $500 to have some new gears put in the rear. I do like having the 80 something mph topend I have now. I do kinda have to nail it in fourth up most hills on the interstate.

**Anticanman** · 07-09-2012, 09:55 AM

If its your daily driver I would keep the 4.10 and possibly get lower gearing in your transfer case if you do any rock crawling.

DontTouchIt · 07-09-2012, 06:24 PM

It is a dd, and we don't have jack for rocks in most of Oregon. Does anyone know the rpm in 5th gear running 35s with 4.56 gears??

**mrmark** · 07-09-2012, 07:04 PM

Quote:

Originally Posted by Anticanman

If its your daily driver I would keep the 4.10 and possibly get lower gearing in your transfer case if you do any rock crawling.

Let's talk gear changes in the transfer case please. I am new to this concept and was suggested this 2 weeks ago by someone else.

I am already starting in 3rd on level ground with the gearing I have in 4Low. Would there be any benefit from me changing the gearing? I would think I am already geared high enough ...

Opinion?

**G30SFF250** · 07-09-2012, 07:53 PM

I can't imagine running 70 MPH in my YJ.

Anticanman, I have told people about what you did.

DontTouchIt · 07-09-2012, 09:36 PM

When I was trying to see the total top end of my jeep, I had it up to 93 going down a grade. Bit sketchy but still worth knowing what it could do. I have heard that doing anything to the NP231 is a waste of money, unless it's a SYE. A NP241 already has a 4:1 low in it.

**Anticanman** · 07-10-2012, 12:53 AM

Quote:

Originally Posted by mrmark

Let's talk gear changes in the transfer case please. I am new to this concept and was suggested this 2 weeks ago by someone else.

I am already starting in 3rd on level ground with the gearing I have in 4Low. Would there be any benefit from me changing the gearing? I would think I am already geared high enough ...

Opinion?

Sounds alright. Try it on the rocks and it'll really tell you.

Quote:

Originally Posted by G30SFF250

I can't imagine running 70 MPH in my YJ.

Anticanman, I have told people about what you did.

I don't know what you're talking about.

Quote:

Originally Posted by DontTouchIt

When I was trying to see the total top end of my jeep, I had it up to 93 going down a grade. Bit sketchy but still worth knowing what it could do. I have heard that doing anything to the NP231 is a waste of money, unless it's a SYE. A NP241 already has a 4:1 low in it.

Good luck finding one.

**Poke** · 07-10-2012, 06:34 AM

Quote:

Originally Posted by DontTouchIt

I have heard that doing anything to the NP231 is a waste of money,

you heard wrong. The NP231 is not the end all be all of production t-cases, the NP205 is. But the 231 is a good solid case. They are stupid simple to work on, light weight, and require little to no maintenance.

I run one on the hardest trails pushing 40's. jumped, beat, tires spinning bouncing... I broke one once because of driveshaft clearance, it was my fault for not giving it enough room.

I'd say for 35's and less it is perfect. If I was sticking with a jeep power plan and t-case i would keep the 231 and order everything JB has to offer to build it up, wide chain, hardened shafts, etc..

tankinyj · 07-10-2012, 08:10 AM

Quote:

Originally Posted by Poke

you heard wrong. The NP231 is not the end all be all of production t-cases, the NP205 is. But the 231 is a good solid case. They are stupid simple to work on, light weight, and require little to no maintenance.

I run one on the hardest trails pushing 40's. jumped, beat, tires spinning bouncing... I broke one once because of driveshaft clearance, it was my fault for not giving it enough room.

I'd say for 35's and less it is perfect. If I was sticking with a jeep power plan and t-case i would keep the 231 and order everything JB has to offer to build it up, wide chain, hardened shafts, etc..

2015 YJ, the hell?

**mrmark** · 07-10-2012, 08:28 AM

Quote:

Originally Posted by Anticanman

Sounds alright. Try it on the rocks and it'll really tell you.

What is a rock? I live in Florida

**Siva283** · 07-10-2012, 09:14 AM

Quote:

Originally Posted by tankinyj

2015 YJ, the hell?

I have been wondering that myself. I figured it was a response to Jsawduste's 2006 one. He built it from parts so it got assignned a 2006 VIN. Seems many people do not beleive him though. However if you talk to him it is obvious he could do it in his sleep.

**Poke** · 07-10-2012, 12:39 PM

Quote:

Originally Posted by tankinyj

2015 YJ, the hell?

yes.

Quote:

Originally Posted by Siva283

I have been wondering that myself. I figured it was a response to Jsawduste's 2006 one. He built it from parts so it got assignned a 2006 VIN. Seems many people do not beleive him though. However if you talk to him it is obvious he could do it in his sleep.

no.