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Old 02-05-2014, 10:54 PM   #1
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Axles, gear, locker instl for TJ with 35" tires

Hey guys, I bought an 05 TJ sport that is lifted with 35" tires, 4.0L, auto trans, and D35 / D30 on factory 3.73 gears.

I'm looking at installing D44's front and rear.

What locker(s) do ya'll suggest.

Also, what gear ratio? Some say 4.56 others told me 4.88.

It's not a daily driver, but my end goal is to have something I can wheel in, but 70+ won't be an issue for on the Hwy.

Any trans upgrades needed with a swap like this? Shift kit?

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Old 02-06-2014, 12:23 AM   #2
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Auxiliary Trans cooler, lower gears, Dana 44 rear, front dana 30 is fine with upgraded 27spline chromoly shafts, ARB air lockers front and rear. Gears I'm not sure (not an auto guy) so I'll leave that open for someone that knows more but either 4.88 or 5.13

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Old 02-06-2014, 06:15 AM   #3
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Dana 30 with chromoly shafts will work fine with 35s; however, you will be limited to 4.88 gears. If you decide to installed a front D44 go with 5.13 gears.

I currently run 35s with 4.88s and thev4 speed auto. I have to keep OD off until I hit highway cruising speed. My transmission constantly downshifts on even a minimal incline.
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Old 02-06-2014, 06:20 AM   #4
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I agree that the front dana 30 is fine. For the rear you can probably find a Ford 8.8 much cheaper than a dana 44 and it is a stronger axle.

Lockers - ARB would be a great choice if you've got the $$$.

For the gears I would go with 4.56. I've got 4.10's on mine with 35s and I can hit 70 without much problem. I can't even imagine what my gas mileage would look like with 4.88s. It's already horrible with 4.10s, I'd probably be in single digits.
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Old 02-06-2014, 06:49 AM   #5
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I agree that the front dana 30 is fine. For the rear you can probably find a Ford 8.8 much cheaper than a dana 44 and it is a stronger axle.

Lockers - ARB would be a great choice if you've got the $$$.

For the gears I would go with 4.56. I've got 4.10's on mine with 35s and I can hit 70 without much problem. I can't even imagine what my gas mileage would look like with 4.88s. It's already horrible with 4.10s, I'd probably be in single digits.
Do you have the 4 speed auto in your rig?
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Old 02-06-2014, 06:56 AM   #6
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I agree that the front dana 30 is fine. For the rear you can probably find a Ford 8.8 much cheaper than a dana 44 and it is a stronger axle. Lockers - ARB would be a great choice if you've got the $$$. For the gears I would go with 4.56. I've got 4.10's on mine with 35s and I can hit 70 without much problem. I can't even imagine what my gas mileage would look like with 4.88s. It's already horrible with 4.10s, I'd probably be in single digits.
A: I'm interested in why the 8.8 is "much stronger" than the 44.

B: With 35's and 4.10 your mpg is likely worse than if you had proper gearing.
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Old 02-06-2014, 07:57 AM   #7
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Do you have the 4 speed auto in your rig?
Yes, 4 speed auto trans.
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Old 02-06-2014, 08:05 AM   #8
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If you want to know what gears are best for you, take some time with this Gear Ratio Calculator.
Gear Ratio Calculator
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Old 02-06-2014, 08:10 AM   #9
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Yes, 4 speed auto trans.
Ignore the 4.10 suggestion from kolky. If you are anywhere near philly you are more than welcome to drive my rig with 4.88s and 35s.
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Old 02-06-2014, 08:27 AM   #10
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Ignore the 4.10 suggestion from kolky. If you are anywhere near philly you are more than welcome to drive my rig with 4.88s and 35s.
I appreciate the offer, but I'm just outside of Dallas, TX.
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Old 02-06-2014, 08:28 AM   #11
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If you want to know what gears are best for you, take some time with this Gear Ratio Calculator. Gear Ratio Calculator
Damn...I hate math. I'll have to dig into this tonight. Thanks for the link man!
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Old 02-06-2014, 09:06 AM   #12
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5.13's are the way to go with 35's and the 4 speed auto.
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Old 02-06-2014, 10:08 AM   #13
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Originally Posted by Big Cole View Post
Dana 30 with chromoly shafts will work fine with 35s; however, you will be limited to 4.88 gears. If you decide to installed a front D44 go with 5.13 gears. I currently run 35s with 4.88s and thev4 speed auto. I have to keep OD off until I hit highway cruising speed. My transmission constantly downshifts on even a minimal incline.
Thanks for the info. Do you know anyone that is running 5.13's and 35" tires? Sounds like it would be awesome for a crawler, but would actually keep you from going hwy speeds (70+)
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Old 02-06-2014, 10:16 AM   #14
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Quote:
Originally Posted by Tj_Stoney View Post

Thanks for the info. Do you know anyone that is running 5.13's and 35" tires? Sounds like it would be awesome for a crawler, but would actually keep you from going hwy speeds (70+)
It would be totally fine on the highway. The 4 speed auto has such a high overdrive gear a very low gear ratio is needed to restore power at highway speeds. You can use that online calculator to put in your tire size, MPH, gear ratio, and transmission ratio to test RPM at different speeds. You will want probably 2650-3000rpm on the highway.

Again though, you would need a new front axle to support the 5.13 gears. Your current Dana 30 front end would be fine locked with chromoly shafts.
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Old 02-06-2014, 01:07 PM   #15
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It would be totally fine on the highway. The 4 speed auto has such a high overdrive gear a very low gear ratio is needed to restore power at highway speeds. You can use that online calculator to put in your tire size, MPH, gear ratio, and transmission ratio to test RPM at different speeds. You will want probably 2650-3000rpm on the highway. Again though, you would need a new front axle to support the 5.13 gears. Your current Dana 30 front end would be fine locked with chromoly shafts.
Thanks for the info. I need to play with that calculator tonight and get this figured out.

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