Should I go 35s or 37s KM2s on my JK rubi axles? - JeepForum.com
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Unread 08-13-2009, 10:31 PM   #1
TX-WJ
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Should I go 35s or 37s KM2s on my JK rubi axles?

OK, so, here's my question; I own an '04 WJ, bear with me here, I've wheeled it for a couple of years on a 2.75" lift and 32s. Last winter, I snapped a rear shaft (D44 aluminum rear end with an Aussie lunchbox locker) and decided it was time to move on with a better drivetrain.

At the time, the JK rubi 44s could be still had for cheap, so I decided to go that route with the intention of running 35s after going to a 6" LA lift; yes, fenders will be cut .

The past couple of months, I've been working on the axles to get them ready to mount under my dubjay; now the front is done (did the EVO gussets/skids and sleeves, as well as a RK truss) with the exception of gears. The rear will be trussed and eventually, will chromolly both F and R.

The WJ is obviously a heavy Jeep, but I'm sure not incredibly more than a 4 door JK (I may be wrong there though ); so for those of you (particularly 4 door JK owners) who have run 35s and then moved to 37s, did you suddenly find yourselves breaking down at the trail all the time?

I know that's a very generic question, but just trying to gauge some concepts that my help me decide whether I ought to stick to 35s or go all the way and get 37s and "be done with it"

FWIW, I think the KM2s do run a little smaller then other MTs .

couple'a pics.









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Unread 08-14-2009, 07:33 AM   #2
N2rock
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K-Rocks pictures Damn shame they closed the place.

With the setup you're talking about- the D44's with gussets, sleeves, trusses, chromo's. I don't think you'll have any problems running 37's. And that is going to be one awesome rig!
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Unread 08-14-2009, 09:02 AM   #3
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You already have braces, gussets, and sleeves. Since you still need gears, go for the 37s.
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Unread 08-14-2009, 11:48 AM   #4
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hey tx-wj, i also have a wj with a jk rubi rear 44 and have bent two axle flanges. I'm running 33's with stock shafts, do you think upgrading to cromolly shafts will prevent this?
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Unread 08-14-2009, 11:57 AM   #5
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Originally Posted by PLAN D View Post
hey tx-wj, i also have a wj with a jk rubi rear 44 and have bent two axle flanges. I'm running 33's with stock shafts, do you think upgrading to cromolly shafts will prevent this?
Oh no!, not what I wanted to hear ; I dunno, that's why Im trying to ask the JK guys see what they have to say..... maybe I oughtta stick to 35s .
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Unread 08-14-2009, 11:58 AM   #6
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Originally Posted by N2rock View Post
K-Rocks pictures Damn shame they closed the place.
Yup, K-rocks was the best, too bad is gone now !
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Unread 08-14-2009, 12:06 PM   #7
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37's on a Dub Jay I think I may need a towel...
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Unread 08-14-2009, 12:17 PM   #8
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Wow- is the WJ that much heavier than the JK Unlimited?
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Unread 08-14-2009, 04:21 PM   #9
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Originally Posted by N2rock View Post
Wow- is the WJ that much heavier than the JK Unlimited?
JK unlimited (Rubicon) curb weight: 4,340 lb source

WJ Limited 4WD (4.7): 4,147 lb source

What gives?

Ninja edit:

JK unlimited (Rubicon) Torque: 240 ftlb @ 4,000 rpm

WJ 4.7 Torque: 295 ftlb @ 3,200 rpm
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