Crossmember/TC Lowering - Why? - Page 2 - JeepForum.com

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post #16 of 29 Old 09-29-2013, 06:02 PM
PolkaPower
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Quote:
Originally Posted by ryanf77 View Post
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...
You need adj control arms to set your pinion angles. Take the drop off.

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post #17 of 29 Old 10-23-2013, 11:40 AM Thread Starter
ryanf77
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So, I finally got the U-Joints done and guess what.... Still have the Vibration! What should my next step be? Should I buy Adjustable control arms and try that or should I go with a Slip Yoke Eliminator... I believe the Control Arms will be lexx expensive and easier to install... Any thoughts? Thanks again...
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post #18 of 29 Old 10-23-2013, 01:02 PM
WhiteOut
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Take the transfer case drop out, use adjustable control arms to set pinion angle.
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post #19 of 29 Old 10-23-2013, 03:03 PM
ElCaminoManT
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which front drive shaft do you have? CV style or u-joints?

i have ~3" of lift on my 93. no t-case drop. no vibes. i have no CVs, all u-joints

1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. Front and rear RC tubular lowers. Rusty's adjustable rear uppers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.
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post #20 of 29 Old 10-23-2013, 03:15 PM
riot1987
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Quote:
Originally Posted by WhiteOut View Post
Take the transfer case drop out, use adjustable control arms to set pinion angle.
x2

The driveline on ZJ's is long enough to not need a Tcase drop.

http://www.jeepforum.com/forum/f22/riots-97-grand-1436100/

Build thread^^
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post #21 of 29 Old 10-23-2013, 03:23 PM
PHARIS88
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I have a 4" lift on my 96 ZJ and with NO transfer case drop, which is unnecessary, you DEFINITELY need ADJUSTABLE control arms for the front and back though, that will solve your vibrations. I'm very sure of it. WHITEOUT is actually the one who helped me out a while back. Thanks BTW.

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http://www.jeepforum.com/forum/f22/1...hread-1507279/
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post #22 of 29 Old 10-24-2013, 02:19 AM
ElCaminoManT
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Quote:
Originally Posted by ElCaminoManT View Post
which front drive shaft do you have? CV style or u-joints?

i have ~3" of lift on my 93. no t-case drop. no vibes. i have no CVs, all u-joints
i jinxed myself. i swapped out the front and rear poly bushed procomp lowers tonight in favor of some RC units with the clevite bushings. the rears are at least 1" if not close to 2" longer than the procomp units which turned my rear pinion angle to ****. 30mph and up its nearly undrivable it vibrates so bad. with the procomp arms, the pinion pointed in nearly the same angle as the driveshaft and actually caused the driveshaft to be pushed into the t-case all the way. with the RC arms, there is quite a bit of slip yoke visible and im concerned that if i try to correct it with adjustable uppers, my driveshaft will be pulled out even further and possibly fall out when the suspension is compressed.





im almost certain that you have the same issue since you are running the 3.5" kit which has the same lowers as i bought. i have an email into mitch in the technical dept at RC for suggestions. have a feeling im going to be looking at adjustable lowers instead....

1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. Front and rear RC tubular lowers. Rusty's adjustable rear uppers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.
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post #23 of 29 Old 10-24-2013, 09:24 AM
speedbucket
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Quote:
Originally Posted by ElCaminoManT View Post
i jinxed myself. i swapped out the front and rear poly bushed procomp lowers tonight in favor of some RC units with the clevite bushings. the rears are at least 1" if not close to 2" longer than the procomp units which turned my rear pinion angle to ****. 30mph and up its nearly undrivable it vibrates so bad. with the procomp arms, the pinion pointed in nearly the same angle as the driveshaft and actually caused the driveshaft to be pushed into the t-case all the way. with the RC arms, there is quite a bit of slip yoke visible and im concerned that if i try to correct it with adjustable uppers, my driveshaft will be pulled out even further and possibly fall out when the suspension is compressed.





im almost certain that you have the same issue since you are running the 3.5" kit which has the same lowers as i bought. i have an email into mitch in the technical dept at RC for suggestions. have a feeling im going to be looking at adjustable lowers instead....
Pinion should NOT be pointed inline with the driveshaft on a 2 joint driveshaft. The pinion should match the same angle as the transfer case output shaft

And the slip yoke is good to about 6" of lift.....

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 #24 of 29 Old 10-24-2013, 12:46 PM
ElCaminoManT
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Quote:
Originally Posted by speedbucket View Post
Pinion should NOT be pointed inline with the driveshaft on a 2 joint driveshaft. The pinion should match the same angle as the transfer case output shaft

And the slip yoke is good to about 6" of lift.....
trust me, i know the pinion shouldnt point inline with the shaft but for whatever reason, it worked fine with that setup. 70+ on the freeways no problem. now with the current angles, not working! im going to drop the t-case an inch or so to see what it does, not holding my breath tho.

when building my brothers s10 jimmy with a dana 30 swap, we did a flip kit in the rear and had to set the pinion angle the same as the t-case output

1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. Front and rear RC tubular lowers. Rusty's adjustable rear uppers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.
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post #25 of 29 Old 10-24-2013, 01:10 PM
PolkaPower
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Weird. My old ZJ was around 4.5-5" and I didn't have vibes. I had all adj control arms though.
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post #26 of 29 Old 10-24-2013, 11:40 PM
ElCaminoManT
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put the rear lower procomp arms back in, all vibes gone. looks like ill be looking for some adjustable uppers now.



sorry for the thread jack OP, but im certain the source of your vibes is the rear axle pinion angle. get some adjustable rear upper arms so you can dial in the pinion angle and the vibes will be gone and there will be no need for the t-case drop = more ground clearance

1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. Front and rear RC tubular lowers. Rusty's adjustable rear uppers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.
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post #27 of 29 Old 10-27-2013, 05:46 PM Thread Starter
ryanf77
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Thanks again for all the response Guys... El Camino Man, please let me know what they (RC) say as well once they respond back. I really appreciate it... Ryan
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post #28 of 29 Old 10-31-2013, 11:11 PM
ElCaminoManT
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Quote:
Originally Posted by ryanf77 View Post
Thanks again for all the response Guys... El Camino Man, please let me know what they (RC) say as well once they respond back. I really appreciate it... Ryan
...gotta get adjustable uppers for the rear

1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. Front and rear RC tubular lowers. Rusty's adjustable rear uppers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.
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post #29 of 29 Old 11-01-2013, 12:32 PM
Pier1308
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I have a 95 zj. Did a 4" suspension lift from zone offroad. Didnt do the transfer case drop. No vibrations at all. My zj has u joints already. Very pleased with it... but i did just snap the shifter linkage when putting it into 4low. Hopefully that was just an age related snap..
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