Crossmember/TC Lowering - Why? - JeepForum.com

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post #1 of 29 Old 09-21-2013, 02:05 PM Thread Starter
ryanf77
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Crossmember/TC Lowering - Why?

I searched the Forum and Couldn't find an answer for this... I just finished installing a Rough Country 3.5" Kit on My Son's 96 ZJ. Is it necessary to install the Transfer Case Lowering Blocks? If so, Why? I am asking because it just makes Me lose some of the nice clearance I just gained!!!

Thanks in Advance...

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post #2 of 29 Old 09-21-2013, 02:12 PM
psychoteen101
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By lifting the suspension, you change the driveshaft angle. Lowering the crossmember drops the T case and helps re correct the angles. Its not a huge difference, only about an inch of drop. Ground clearance isn't a huge factor with that. Theres a reason it came with the kit, so it should be installed. If you don't, you might get driveline vibrations.

1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
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post #3 of 29 Old 09-21-2013, 02:19 PM
WhiteOut
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Quote:
Originally Posted by psychoteen101 View Post
By lifting the suspension, you change the driveshaft angle. Lowering the crossmember drops the T case and helps re correct the angles. Its not a huge difference, only about an inch of drop. Ground clearance isn't a huge factor with that. Theres a reason it came with the kit, so it should be installed. If you don't, you might get driveline vibrations.
OP: You can disregard the quoted post. Next he'll tell you that you need an SYE

You don't need to install the transfercase drop. Yes, it will help the rear angle a bit, but it hurts the front angle.
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post #4 of 29 Old 09-21-2013, 02:24 PM
Rushton623
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I have a 3.5 lift and don't run the t case drop and haven't noticed a thing. You should be fine
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post #5 of 29 Old 09-21-2013, 04:08 PM
PCsZJ
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Running an IRO 3.5 lift with no transfer drop..No problems here also
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post #6 of 29 Old 09-21-2013, 05:24 PM
PolkaPower
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You don't need it. I was at 4.5 with no issues.
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post #7 of 29 Old 09-21-2013, 05:26 PM
98GCLimited
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Quote:
Originally Posted by PCsZJ View Post
Running an IRO 3.5 lift with no transfer drop..No problems here also
x2
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post #8 of 29 Old 09-21-2013, 05:29 PM
dnuccio
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from what ive read on here, ZJ will never need a transfer case drop. it might need a SYE at really high lift heights (7"+), but a t case drop is a waste of money

Reliability is relative
R.I.P. Ratmonkey
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post #9 of 29 Old 09-22-2013, 11:10 AM
LoveHate
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I had vibes in the front with the tc drop, now without the drop I have no vibes. so the drop is a total waste of ground clearance.

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post #10 of 29 Old 09-22-2013, 11:31 AM
Texas ZJ1
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I had it on mine.. oh disbelieving masses.

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post #11 of 29 Old 09-22-2013, 04:16 PM
Niles19
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Every zj is different I had vibes w/o then I took out mine front DS and they went away. So I put in the TC drop and they are gone. who knows maybe I need to adjust my upper ca's but the TC drop doesn't bother me. just go w/o and see what happens.
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Originally Posted by Texas ZJ1 View Post
I had it on mine.. oh disbelieving masses.
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post #12 of 29 Old 09-22-2013, 06:05 PM
Texas ZJ1
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Wow, after 19 years I'm just now hearing this?

Thanks, go read the FAQs page.

Hunter

04 4.7 HO, limited

08 Z71 Suburban, front leveling kit with rear spacers. 285/65 18s Nitto TerraGrappler G2s

94 5.9 Laredo 6.5 RE lift with 35 Maxxis Bighorns
and 33 Bridgestone Duelers
Detroit and true trac
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post #13 of 29 Old 09-23-2013, 09:38 AM
speedbucket
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The Rc 3.5 kit is an incomplete lift. depending on which transmission you have you may not need it

http://www.jeepforum.com/forum/f22/speedbuckets-zj-build-1361322/
V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #14 of 29 Old 09-24-2013, 09:04 AM Thread Starter
ryanf77
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So, I took the Jeep out last Night for a Cruise after the Lift and I think I answered My own Question... I have really bad vibration coming from the Rear... Guess I need to try the Drop Kit and see if that fixes it... Thanks again for all the reply's everyone... Ryan
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post #15 of 29 Old 09-29-2013, 05:58 PM Thread Starter
ryanf77
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Update: I installed the Cross-Member Lowering Kit that came with the lift kit and it helped some... But, at about 35mph the vibration starts and it's still pretty bad! It goes away for the most part when I let off the throttle... I have the Rear Drive Shaft out now and am going to install new U-Joints to see if that fixes it but I am doubtful that it will as they feel pretty tight... I'll update again once the U-Joints are in in a couple days...
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