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Old 03-20-2015, 06:35 AM
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Looking for advice on regearing

Lets start off with me knowing little about what it takes to replace and install something like new gears...

Current set up is LP D30 front and Ford 8.8 rear both running 4.10's. All of which was installed by the previous owner. They do great with my 35's but I have room for bigger. I got my eye on some 37's and I dont think the 4.10's will cut it.

So, what would be a better set of gears be? 4.88's? Would I need to change carriers? axle shafts?

Any suggestions would be great, I do have an open mind but a limited budget due to my Comanche project...

Thanks!

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Old 03-20-2015, 07:59 AM   #2
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More info is needed. What year, engine, lift size, transmission type? Not sure that the D30 will be strong enough. Is this your toy or DD?.....

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Old 03-20-2015, 08:00 AM   #3
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the re gear is the least expensive part of the equation.
1st the D 30 is not strong enough for the 37's. Second it takes a bunch to get a TJ set up to run 35's let alone 37's.

To answer your question however, 5.13's.
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Old 03-20-2015, 02:55 PM   #4
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X3, the Dana 30's housing and ball joints are not up to anything larger than 35's. I'm running a TJ Rubicon Dana 44 up front with CTM u-joints and Superior Axle 30 spline hardened alloy axle shafts (similar strength in the rear D44 too) and I'm still limiting my tire size to 35".

If you're running a 5-speed transmission, I'd regear to 4.88 and keep the 35's. That's a sweet combination. If you don't have the 5-speed, what transmission do you have and what is your TJ's model year?

Not to mention that at least for now, 4.88 is the lowest ratio the front Dana 30 can be geared to.
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Old 03-20-2015, 04:13 PM   #5
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in addition, 37's on a F8.8 brings you back to the need for being easy on the gas pedal. there are opinions out there as to how jiggy a TJ gets with 37's and how it's best to stretch the wheel base or just build a buggy at that point, but I'm not going to start that debate
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Old 03-20-2015, 06:37 PM
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Sorry for the lack of info...
1998
4.0I
Auto trans
4" suspension/3"body
I drive it to work maybe once a week but mostly used for trails and dunes.

Sounds like I had my hopes up with the larger tires. Now that my focus has moved to my MJ project I was just curious on the different opinions on the axles.
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Old 03-20-2015, 06:41 PM   #7
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Ok good, that transmission question answered means you have the 3-speed 32RH. The correct ratio for 35's for that particular transmission, because it does not have an Overdrive, is 4.56. 4.88 would be too low of a ratio for you, your RPMs would be over 3k on the highway with 4.88's and 35" tires.
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Old 03-20-2015, 11:36 PM
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I never take it on the highway or drive over 60 in it really. For the sake of me being difficult and stubborn to get my way.... from what your saying Jerry, is if I switch my ring and pinion out for 4.56 or 4.88 the axle housing would fall apart on me. If I get a top shelf ball joints and beef up the housing could I get away with keeping the D30? Would the R&P be the only thing needed for the swap? If I do get the 37's, how long you think it'll take before the poo hits the fan and I'm stuck out on the trail? (sorry for all the hypothetical questions, just trying to see the big picture)
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Old 03-20-2015, 11:40 PM   #9
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Cheep safe and 37 inch tires cannot all be done

Safe and 37 is expensive and cheep shortcuts ain't safe with that size tires
Gears is only a small part of expense of doing 37 safely
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Old 03-20-2015, 11:44 PM   #10
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Quote:
Originally Posted by Tj1 View Post
I never take it on the highway or drive over 60 in it really. For the sake of me being difficult and stubborn to get my way.... from what your saying Jerry, is if I switch my ring and pinion out for 4.56 or 4.88 the axle housing would fall apart on me. If I get a top shelf ball joints and beef up the housing could I get away with keeping the D30? Would the R&P be the only thing needed for the swap? If I do get the 37's, how long you think it'll take before the poo hits the fan and I'm stuck out on the trail? (sorry for all the hypothetical questions, just trying to see the big picture)
What he's saying is that the Dana 30 axle housing, gears, balljoints, axle shafts, and brakes are ALL not up to 37" tires.
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Old 03-23-2015, 11:31 AM   #11
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Quote:
Originally Posted by Tj1 View Post
If I do get the 37's, how long you think it'll take before the poo hits the fan and I'm stuck out on the trail? (sorry for all the hypothetical questions, just trying to see the big picture)
anytime

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