Wierd shutter

jrsxj98

DILIGAF

Location

Crawlorado

• Sep 20, 2005

• #1

Ok little back ground first....
8" lift Long Arms
RE sye cv shaft. newly rebuilt frt cv shaft
pinion approx 2* down.

at 70 mph range get a harmonic drone. but the problem occurs after I let of the accel. and then start accel. again between 1200 and 1700 rmp I get a pretty harsh shutter. Motor mounts look good. ujoints are solid. question is would a worn tranny mount cause this or am I over looking something else?

 

ren

NAXJA Forum User

Location

frenchburg, ky

• Sep 20, 2005

• #2

have you checked the rear drive shaft for trueness/dents/wacks?

 

jrsxj98

DILIGAF

Location

Crawlorado

• Sep 20, 2005

• #3

Yeah there is just a small scrape in it from a trail run nothing major. If I cant track this down I was gonna take it and have it rebalanced. I am leaning more towards motor or tranny mount at this point.

 

ren

NAXJA Forum User

Location

frenchburg, ky

• Sep 20, 2005

• #4

Well, before you yank the D/S, I agree with checking the mounts. Do you know how to check the tranny mount? I think that is the one that would most likely cause the Shudder that you have, because my MJ tranny mount is collapsed, and the exhaust pipe rattles on the x-member pretty often.

 

B

bigwhitey

NAXJA Forum User

Location

Brunswick, ME.

• Sep 20, 2005

• #5

Try removing the rear drive shaft and driving with just the front, then vice versa. That should narrow it down a bit.

 

ren

NAXJA Forum User

Location

frenchburg, ky

• Sep 20, 2005

• #6

Just read the specs. on your XJ again, and noticed that you have a CV shaft inthe rear. It is possible that the center pivot of the CV is going bad. I had this happen on 2 Dodge trucks on the front shaft and they shuddered real bad. Turned out that the center of the CV was galled and frozen. Amazing what happens when you forget to grease something.

 

XJ_ranger

NAXJA Member

NAXJA Member

Location

Port Orchard, WA

• Sep 20, 2005

• #7

....

 

jrsxj98

DILIGAF

Location

Crawlorado

• Sep 20, 2005

• #8

Both CV shafts were just rebuilt in July.

 

ren

NAXJA Forum User

Location

frenchburg, ky

• Sep 20, 2005

• #9

Have you tried using less "down" angle on the pinion? It is possible that the angle is too great, and is causing a bind on the lower joint of the drive shaft. Just an idea.

 

jrsxj98

DILIGAF

Location

Crawlorado

• Sep 20, 2005

• #10

Less down angle will cause the pinion to go past vertical on accel. I am pretty sure this is not a driveshaft issue.