3in lift vibrations

9

90xj06

NAXJA Forum User

Location

Peabody, MA

• Oct 26, 2010

• #1

hello,

i have just put a rustys 3in spring pack lift on my 1990 xj. i seem to be having vibrations at 30 mph. at high way speeds it gives a weird sound like 2 gears clanking.

now the rear leafs are 3.5 inch in lift right now until they break in.

will the problems go away after the leafs break in?

would a transfer case drop fix it?

or should i get a longer slip yoke. don't really want to get a sye if i don't have to right now.

the vibrations are not too bad there like driving on the rumble strip on the shoulders. and only at from 30-35. after that there not noticeable.

any help would be great.

 

K

krnkimchi702

NAXJA Forum User

Location

alaska

• Oct 26, 2010

• #2

i have the same problem.. it would be great if someone could give some insight... i also do get the "clunk" sound randomly

 

S

Samson04

NAXJA Forum User

Location

Taylorsville, KY

• Oct 26, 2010

• #3

I have a 3-1/2" Skyjacker lift on my 98xj and it also had vibration in the drive after installation. Transfer case lowering kit solved the problem. It is because your drive shaft is at a steeper angle than is ideal.

 

W

WB9YZU

NAXJA Forum User

Location

Madison, WI

• Oct 26, 2010

• #4

Please move to MOD TECH.

Edit: Sorry, still asleep, I meant to hit the Triangle :

 

L

lowicz96

NAXJA Forum User

Location

Flint/Asheville

• Oct 26, 2010

• #5

Did you install shims in the rear to raise the pinion up? I didnt get vibes at 3.5" but my rear DS ujoints are going out quick from no shims

 

9

9se7en6

NAXJA Forum User

Location

layton,utah

• Oct 26, 2010

• #6

shims are cheap..........

 

9

90xj06

NAXJA Forum User

Location

Peabody, MA

• Oct 27, 2010

• #7

i have no installed shims but im thinking of doing the TC drop. ill look into the shims also. but should i get a longer slip joint to make up for the fact that it is pulled out further?

 

K

krnkimchi702

NAXJA Forum User

Location

alaska

• Oct 27, 2010

• #8

what would be cheaper? shims or tc drop

 

9

90xj06

NAXJA Forum User

Location

Peabody, MA

• Oct 27, 2010

• #9

rustys has a tc drop for $20
shims for 16. should i go with 3 degrees or 6 on the shims?

 

W

WB9YZU

NAXJA Forum User

Location

Madison, WI

• Oct 27, 2010

• #10

I doubt that your yoke is pulled out enough to make any serious difference. The issue is driveshaft angles. Quick and dirty is to do a TC-Drop. Fancy would be to measure your driveshaft angles to determine how far they are off and what size shim you need to fix the problem. The key to proper DS angles is equal an opposite.

 

K

krnkimchi702

NAXJA Forum User

Location

alaska

• Oct 27, 2010

• #11

could someone give me a ghetto ms paint description on how to figure out how to measure the angles of the ds so that i can figure out what angle i need to get for the axle shims

 

T

thetinman

NAXJA Forum User

Location

Detroit,MI

• Nov 9, 2010

• #12

Zuki-Ron said:

I doubt that your yoke is pulled out enough to make any serious difference. The issue is driveshaft angles. Quick and dirty is to do a TC-Drop. Fancy would be to measure your driveshaft angles to determine how far they are off and what size shim you need to fix the problem. The key to proper DS angles is equal an opposite.

Click to expand...

So, how do you measure your DS angles?