Hello folks. Thanks again to all of you for helping me through my 4 inch
suspension lift issues. ;-) My new driveshaft and slip yoke conversion kit are
on the way. I was told that I will need adjustable rear control arms to help
the pinion angle. What kind should I get? Should I get them for the front as
well? I also saw some raised poly motor mounts. Are these gonna help anything
in my situation? Thanks again everyone.
Rear upper control arms will rotate your axle, changing the driveline angle.
You won't NEED lowers, or anything on the front, but it's a good upgrade
cause the stock control arms don't take much of a beating. About the only
good thing about them is you can always find someone selling a set really
cheap (ask me how I know). I currently have a set of Rubicon Express control
arms. They seem to do the job. I hear the Currie arms are really great...
but they cost a little more.
A motor lift also changes the driveline angles in your favor. I don't know
anything about Poly mounts. M.O.R.E. makes a replacement for the stock motor
mount that they call "Bombproof". I assume that's because it is. I went the
way of the JKS spacers. Aluminum bricks that go under the stock motor
mounts. Keep in mind that, if you raise your engine, and do not raise your
body (as with a body lift), you will need to address your radiator fan
shroud. It's a simple matter of moving it up so the fan does not hit the
shroud. I've heard some people even trim the shroud to avoid contact.
At any rate, you're into mods that lead to other mods... It's when the fun
Adjustable control arms will be necessary to change your rear pinion
angle. You want the rear pinion input to point directly at the CV
joint in the rear driveshaft. You can get either adjustable uppers,
adjustable lowers, or both. You would need both to keep the axle in
the same exact location as it is now (lengthen the upper, shorten the
lower). However, you'd also be fine to just get adjustable lowers
(what I have done) and leave the uppers stock. Shorten the lowers
alone. It doesn't take a lot to angle that pinion up where you want
it. You may lose an inch of wheelbase at most.
The raised motor mounts can help with driveline angles, but your CV
shaft and a properly angled rear pinion should be sufficient on its
own. If you do ever decide to go with aftermarket (raised or not)
motor mounts, I would recommend against getting the kind with
polyurethane bushings. These will transmit much more engine vibrations
through the frame and into the cab. I have aftermarket motor mounts,
but made sure to get some with high-strength rubber bushings. Mine are
the M.O.R.E. brand (MORE sells both the poly and rubber styles, I got
their rubber style).
True but shortening the wheelbase any at all, even just an inch, is not a
great idea on a Wrangler that already has a very short wheelbase. If I had
a choice between buying upper or lower adjustable-length arms for setting
the pinion angle, uppers win every time in my opinion. :)
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