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Old February 2nd, 2006, 02:13 PM   #1
Haggar
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Default Would like Honest opinions of Rubicon gearing, or others running 4:1 geatsets

I'm looking at some gearing options for my rig, and noticed my setup would put me right about where a stock rubicon gearing is when tire size is factored in. Well, a touch lower, but its a 4-cyl application (older Jeep).

My question, those with the low T-case gearing, have you been hampered by in in low range?

By my calculations, I could run up to about 20 mph with this setup, that would be spinning 3200 rpm, which its an OHC 4 cyl, so I don't think that is an issue.


You guys with 4:1 t-case gears, is it good or does it become a problem?

thanks for any input!
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Old February 2nd, 2006, 02:56 PM   #2
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I wheel with a couple rubicon owners, and they all say the same thing, "Low range is pointless"

Solgoode and romey will have some good insight for you.
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Old February 2nd, 2006, 03:04 PM   #3
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I've heard that, but then, I've wheeled for years with Dave in the Mud Shark. Dave's running 3.15 T-case gears, 4.11 axle gears, TH350 with 33" tires..

That would put his gearing almost the same in low range as a Rubi, and his Jeep is one of the most capable I've seen (well, I think Dave is a big part of that...).

Without a lockup converter, I believe him to be pushing about 3000 rpm in 3rd low, which I figure a 4 cyl would handle 3200 as good as a 258 running 3000 rpm...
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Old February 2nd, 2006, 04:06 PM   #4
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I've had my Atlas 4.3 for a few years with different tire/axle combos, all with 4.0/nv3550. (33s & 3.73s, 35s & 4.56, 39s & 4.88)

First, the lower low range is not very useful if all your planning on doing is most Michigan terrain. You'll be in 3rd - 5th gear all day long if just bombing trails, or popping between high and low.

If you plan on going out of state to play in the rocks more than the occassional Badlands trip, then 4:1 is more worthwhile. For that, I've loved it. No more silly clutch slipping to try and climb, just drop it in 1st and let it pull. If I need to do faster launches, just drop a gear or two.

I think a doubler (or stak) is a much better solution for varied terrains. I've thought about installing a 203 in front of my atlas for that in-betwen gearing, but I really like my driveshaft length the way it is now, and don't want to change it.

I'd think about it if I went to a shorter engine and could push my drivetrain forward so my front driveshaft wouldn't be over 50" long, but not right now.
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Old February 2nd, 2006, 04:21 PM   #5
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I run dual T-cases now in my toyota. My issue is this is for my flatfender. Even with pushing the rear axle backwards about 8", I'm not sure how much drivetrain length I'll have.

If it'll fit, I'll drop my entire Toyota driveline in there, just don't know if it will fit.

On my TJ, I rarely if ever used 5th-low, and never used 3rd-low in my CJ. 2nd low in the CJ was 2600 rpm @ 20 mph.

I suppose I could drop in my 4.11s instead of the 4.88s, but thats going to hurt the overall gearing.
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Old February 2nd, 2006, 10:37 PM   #6
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I have 5.38's, 4to1 case, and an ax-15... it puts me at around 88 to 1 on 36's.

I actually wish I was a little lower :)
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Old February 2nd, 2006, 10:57 PM   #7
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I am at 108:1 in low/low. There have been several times on down hills that I wish I was slower, finding myself using the brakes. I am adding a 4.7:1 case in the back of my setup. Should be put me in the 180:1 range.

I don't run mud much, I mostly run on the rocks and tight trails. The gearing works good for me. I could not imagine not having crawler gears.
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Old February 4th, 2006, 11:00 AM   #8
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The issue isn't overall crawl, that I'd be fine with, the issue is are you hampering yourself by not having enough higher range to run up the higher speeds, say on a snow run where high range is going to strain/overheat the motor, but crawling through 18" of snow isn't right either..

I am at 100:1 in the truck with double low, 4.88s. If I can fit that into the flatfender, it'd be great. Just don't think it will fit with the short wheelbase...
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