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post #1 of 6 Old 02-18-2020, 08:05 PM Thread Starter
Ttim
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drive train upgrades

finishing off my fun rig with new stuffs before i go back to the trails this year. 99 with 4.7, Iron Rock 6"lift, running 33s with more possibly coming in the future. found a place locally that sells rebuilt hd select trac transfer cases for $800, but not sure of how good that price is, as i cant find any for sale to compare it to.

i want to upgrade the axles to matching d44s. my understanding is that the jk axles are a pretty close match in width. anyone know how accurate this is? i also sourced a local guy who has a complete set out of a rubicon with low miles, 4.10 gearing. asking $5k for the set.

with the automatic and v8, would this gearing be sufficient, or would i need to do more like a 4.88? i know im going to have to cut the mounts off and weld the right ones on, so if a regear needs to happen i might as well start with something cheaper and build it up, is my basic thinking. i dont get much free time, which is why the rubicon axles are an appealing, if more pricey, option

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post #2 of 6 Old 02-18-2020, 10:28 PM
Bigrigr
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800 bucks for the rebuilt 242HD may not be to bad of deal. People pay 300-500.00 for a used one with a rear driveline to swap in. Just be aware that you will need a different rear driveline to go with it.

4:10's wont be low enough if you will be 33's-35's, Jeep set these things up with 3:73 gears for 29" tires. With 35's, 4:88's might not even be enough...Look up a good gearing calculator on the Interwebs and play a little with it.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,3"BBfront,2"BBrear,JK'sW/32's
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post #3 of 6 Old 02-19-2020, 06:56 AM Thread Starter
Ttim
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I will do the double cardan (sp?) rear driveshaft because of the lift input on. It might not be needed, but the old one was shot so might as well do a really nice one. I have the same for a front driveshaft already.

I am disappointed the gearing won't work tho. I've driven it from Denver to Moab a few times, it actually drives pretty damn good up and over the mountain passes. But I want the off-road and crawling ability more than an easy 80-90mph cruise speed.
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post #4 of 6 Old 02-19-2020, 11:53 AM
smokeyyank
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Evergreen in CO?

$800 is pretty pricey. When I bought mine I paid $275 for the tcase and driveshaft from a dismantler. Rebuilt kits aren't that much. Check out car-part.com I'm showing possibly a few 4.7 242's around if you're in Denver.

I would disagree about 4.88's not being enough even 4.10's you could probably be fine on. If you had a 4.0 probably not enough but in the 4.7 shouldn't be an issue. I run 32's on 3.73's and can haul up I70 at 80+ without issues plus does fine off road. No lack of anything. 4.88's on 35's would be plenty. I would pass on the JK 44's at 5k that's stupid expensive. Might as well just go to tons or build something. You can swap in a 9" in the rear and regear the D30 up front with a truss. If you're lucky look for a HPD44 and 9" combo. Full width, super buildable and less clunky then tons. I'll eventually put that combo on mine when I have the cash to do it with LA.

04 WJ, 4.7HO
3" IRO lift, fastman TB, 32s, lunchbox rear 242HD, 3" exhaust
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post #5 of 6 Old 02-20-2020, 05:52 PM Thread Starter
Ttim
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Quote:
Originally Posted by smokeyyank View Post
Evergreen in CO?

$800 is pretty pricey. When I bought mine I paid $275 for the tcase and driveshaft from a dismantler. Rebuilt kits aren't that much. Check out car-part.com I'm showing possibly a few 4.7 242's around if you're in Denver.

I would disagree about 4.88's not being enough even 4.10's you could probably be fine on. If you had a 4.0 probably not enough but in the 4.7 shouldn't be an issue. I run 32's on 3.73's and can haul up I70 at 80+ without issues plus does fine off road. No lack of anything. 4.88's on 35's would be plenty. I would pass on the JK 44's at 5k that's stupid expensive. Might as well just go to tons or build something. You can swap in a 9" in the rear and regear the D30 up front with a truss. If you're lucky look for a HPD44 and 9" combo. Full width, super buildable and less clunky then tons. I'll eventually put that combo on mine when I have the cash to do it with LA.

yes, evergreen, colorado. the closest 242hd is in nebraska, they want almost 400 for shipping alone, because i dont have access to a business address with a dock or forklift. when everything adds up, its not worth my time for the very small savings. time is my biggest issue with most of this, since i work 7days a week on average. i have been looking at car-part.com for a bit tho. just no luck within 100 miles.
i thought someone had told the the d30 would be a bad choice if i wanted to regear past a 4.10?
another thing i need knowledge on was the axles widths. are all 9" the same width, if you get one it would match with a d44 full width? this is my first build that was not a tj so my knowledge is lacking on full size.

EDIT:apparently, car parts has a different setup when using mobile. just looked again on my laptop, and have several options locally.
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post #6 of 6 Old 02-20-2020, 08:18 PM
smokeyyank
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Nice! I'm up around Vail but grew up in Littleton.

Other thing will be the driveshaft. If you dont get one you'll have to modify yours to work. That can be a few hundred. You also have to call around and confirm. Few places I asked either had no clue or it was listed wrong. I get the thing about time though.

Wms is about the same between a 9 and jk d44 at 65". You just need to look for a f150 31 spline big bearing are ideal. You can easily run 4.10s on a d30. 4.88s are about the max but I know they have a 5.13 for the XJ d30.

04 WJ, 4.7HO
3" IRO lift, fastman TB, 32s, lunchbox rear 242HD, 3" exhaust
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