Gearing Discussion

[Tumbleweed13]

Axle gearing question. TJ, Rubicon, with manual tranny, on 35's. "Best" ratio for a daily driver? 4:56, 48, or 5:13

[aw12345]

Fred on his used to be a Rubicon, ran 4.88 with a 5 speed manual, for the auto 5.13 seems to make overdrive usable and makes em crawl real nice

[6spdYJ]

It depends on which manual. If you have the NV3550, 4.88 should work pretty well. 5.13's may be a bit steep. If you have the NSG370, the ratios are so much lower, you could probably do 4.56's. You effectively have an extra 1/2 turn in 1st and an extra 1/4 turn 2nd -4th. 5th is what 4th used to be and the OD dropped from .79 to .84. I'm running 4.10's on 32's and it's fairly low. Acceleration is easy and I turn 2600RPM at 65MPH.

[alittleoff]

Hey all, FWIW I have the NV3550 (4.01 1st.) Atlas II (5 to 1) and the D44/60 w/4.88's on 35". On the street its similar to stock gearing and 29" tires.

Steve

[Tumbleweed13]

It depends on which manual. If you have the NV3550, 4.88 should work pretty well. 5.13's may be a bit steep. If you have the NSG370, the ratios are so much lower, you could probably do 4.56's. You effectively have an extra 1/2 turn in 1st and an extra 1/4 turn 2nd -4th. 5th is what 4th used to be and the OD dropped from .79 to .84. I'm running 4.10's on 32's and it's fairly low. Acceleration is easy and I turn 2600RPM at 65MPH.

I want 5:13's for the trail. But I was thinking 4 88's would probably be best.

I thought all TJ rubi's have the NV3550. I'll have to figure out what I have in my 03. Is there a visual tell, That I can look for? Thanks for the info.

[aw12345]

You got a nv3500 the older TJ's had the AX15, then they went to NV3500. 2005 and later uses the 6 speed ngs370.

[Tumbleweed13]

You got a nv3500 the older TJ's had the AX15, then they went to NV3500. 2005 and later uses the 6 speed ngs370.

Yeah, mine's a 5 speed. That solves that. Thanks