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Old April 12th, 2011, 11:15 AM   #1
XJay
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Default V8 TJ Build - Axle selection feedback

Looking to get some opinions on which direction to take regarding axles to go under a TJ build. Here's the short story; have a '90 XJ that I've wheeled for the last 5 years, 350/700R4, D44/9", 37s. Loved the rig but hated the body damage it suffered every time out. Well I have the chance to restart, unwillingly however as the result of letting a friend take it for a boot and rolling it.
Picked up a '97 TJ and 350/4L60E out of '99 Yukon. Planning on doing a 3-link/4-link with coilovers. Been doing a pile of research and reading on which axles to run and have changed my mind 30 times in the last 30 days. The Jeep will be used for trailriding/crawling in the typical Michigan/Ontario environment, usually muddy, slippery rock. Would like to run a 42" tire, street use would be nice but not a necessity, I usually trailer everywhere I go.
I wheel with some guys on Rockwells and 44 to 49s. I thought about going in this direction as it would most likely be one of the cheapest, but I have decided against it for now as I would like the Jeep to be able to fit in a toy hauler at some point down the road.
I considered taking my 44/9" and putting good shafts up front and 35 spline the rear yadayada... but that front would still be a timebomb. I want it to be bombproof.
Then there's the tried and true 1 ton D60/14bolt, probably the best choice, I'm just not sold on it yet.
The option I'm leaning towards right now is dual 9 inches. I love 'em, always have, I think they're the best combo of strength vs weight. The question is would they hold up to a 42" tire with a V8 and a fairly heavy right foot. Could go 35 spline front and rear. The part I don't like is the $$$, and that the shafts would have to be custom (Moser or whatever), makes it difficult to carry spares. Would love to use Hi-9s but not sure if that's gonna be in the budget.
Looking for any other ideas, opinions, experience with the mentionned axles...
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Old April 12th, 2011, 12:01 PM   #2
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I would think with good shafts, and aftermarket 3rd's and axle housings, they'd hold up fine. I'm looking at the same path for my Scrambler sometime soon.
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Old April 12th, 2011, 12:38 PM   #3
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I've been running a 35 spline True Hi-9 in the rear. No problems and it's worked out great. I have no desire to go back to a low pinion.
In the front, either do a HP-60 or a 609.

Any way you shake it, with your desired tire size, you need 35 spline axle shafts.
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Old April 14th, 2011, 08:00 AM   #4
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Originally Posted by whiterhino View Post
I've been running a 35 spline True Hi-9 in the rear. No problems and it's worked out great. I have no desire to go back to a low pinion.
In the front, either do a HP-60 or a 609.

Any way you shake it, with your desired tire size, you need 35 spline axle shafts.
Just out of curiosity, what kind of rough HP #s and tire size are you running? Also, Hi-9 claims that street use is not an issue, any experience with this?
It would be really tough for me to fit two Hi-9's in my budget, if I were to go high-pinion, should I go front or rear? Is there any strength difference between a High-9 and a regular LP 9-inch assuming shafts and all other components are the same?
Thx.
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Old April 14th, 2011, 09:21 AM   #5
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Quote:
Originally Posted by XJay View Post
Just out of curiosity, what kind of rough HP #s and tire size are you running? Also, Hi-9 claims that street use is not an issue, any experience with this?
It would be really tough for me to fit two Hi-9's in my budget, if I were to go high-pinion, should I go front or rear? Is there any strength difference between a High-9 and a regular LP 9-inch assuming shafts and all other components are the same?
Thx.
39" Iroks & 39" red-labels, 6.0 LQ9, so about 350hp.
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Old April 14th, 2011, 09:51 AM   #6
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Yup, Hag gar remembers well. I've run it 20+ miles on the road at one time with no heat issues. Yes, it does seem a bit warm, probably in the 140* range.

To me, Hp is the best way to go period but if I had to do one or the other, it would be rear. With the front, most of the time you are able to work your dif around a rock, whereas the rear is a follower and is more likely to get hung up. In addition, with a HP rear, ledges are never a problem.

Regarding strength, go to the Hi-9 website. They have a whole section dedicated to comparing the strenght to other dif's.
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Old April 14th, 2011, 10:11 AM   #7
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Quote:
Originally Posted by XJay View Post
Just out of curiosity, what kind of rough HP #s and tire size are you running? Also, Hi-9 claims that street use is not an issue, any experience with this?
It would be really tough for me to fit two Hi-9's in my budget, if I were to go high-pinion, should I go front or rear? Is there any strength difference between a High-9 and a regular LP 9-inch assuming shafts and all other components are the same?
Thx.
You can get a Hi-9 for the rear and a high pinion D60 for the front, so you can have both.
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