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post #1 of 10 Old 01-07-2010, 02:45 PM Thread Starter
pfifer
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Gearing question...

Yes I know there's tons of thread out there with this topic but I felt that none really answered my specific question.

Question:

Well I am tired of my 4.10 and 35 inch tire combination that I put in last June ..and I am looking into re-gearing the right way this time...now I have been thinking 4.56s because I DD it and do a little highway speed every once in a while...but don't want to sacrifice crawling off road or fuel mileage..so I am torn between the 4.56s or 4.88s.

Also I had the D35 upgrade to alloys and a tru trac last year (and I don't want to hear that its a bad axle or don't put money into it...I have faith in my D35 ) in your opinion what would be the best ratio between 4.88s or 4.56s to keep breakage to a min..and I have driven hard with my 4.10s and nothing has every broken in my D35. And I am also in the process of upgrading the D30 up front with alloy x joints and a tru trac.

Long story short...I want the best overall fuel mileage and off road/ on road performance I can get from the Jeep as a DD..while not having to always worry about breakage when i go wheeling every other month.

Thanks!!

Btw it has:

4.0, AX-15, D30/D35 with alloys and TruTrac, and 35x12.5 Mickey Thompsons

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post #2 of 10 Old 01-07-2010, 03:03 PM
Knuckelhead
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4:88's...IMO
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post #3 of 10 Old 01-07-2010, 03:07 PM
Wheelin98TJ
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I would also suggest 4.88.
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post #4 of 10 Old 01-07-2010, 03:51 PM Thread Starter
pfifer
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So with the 4.88s my fuel mileage would still be good...(atleast 12 mpg)?

And the D30/D35 would be cool with this gearing?
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post #5 of 10 Old 01-07-2010, 04:08 PM
Jerry Bransford
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4.88 is going to be the most efficient for 35" tires and will be as good with fuel economy as your Wrangler is capable of.

Be careful though, 35" tires with 27 spline axle shafts even when alloy is a risky combination.

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post #6 of 10 Old 01-07-2010, 04:19 PM Thread Starter
pfifer
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Quote:
Originally Posted by Jerry Bransford View Post
4.88 is going to be the most efficient for 35" tires and will be as good with fuel economy as your Wrangler is capable of.

Be careful though, 35" tires with 27 spline axle shafts even when alloy is a risky combination.
Thanks...I believe I will go with the 4.88s....and yea I know the 27 spline shafts aren't the best but for my budget right now they will have to be as they are...And anyway crawling should be easier on the shafts I would think, than having to always use the gas off road as I do now, right?
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post #7 of 10 Old 01-07-2010, 04:42 PM
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4.88 hands down IMO. The difference between the two is about 150 rpm at highway speeds, I can't see that affecting gas mileage enough to worry about. You can calculate it for yourself here:

Gear Ratio Calculator

I would want the slightly lower gears to sling 35's around with.

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post #8 of 10 Old 01-07-2010, 05:01 PM
robncar
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4.88 would be the ratio of choice for your situation. Re-gear is expensive, do it once.

http://www.jeepforum.com/forum/f9/diy-alignment-kit-steps-w-pics-2264465/
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post #9 of 10 Old 01-07-2010, 05:09 PM Thread Starter
pfifer
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So I could I make the alloy/trutraced D35 or at least the alloy/trutraced D30 last with 4.88s for awhile..I only wheel every other month at most and its a DD...I just think that whats helped save my axles off-road is having the 4.10s..but on the road 4.10s suck...Is the difference in torque going to the shafts a huge gain with 4.88s over the 4.10s?
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post #10 of 10 Old 01-07-2010, 06:14 PM Thread Starter
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bumppppppppppppp
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