Front DS moves! OK?

jdxj

NAXJA Forum User

Location

Colorado Springs

• Jun 14, 2008

• #1

I have some Vibs for a second when letting off or pushing the gas pedal. So I'm under the jeep checking U joint s ect. All seems fine but the front DS rotated about a 1/4" either way before it stops. Is that normal? The rear one is solid. So it seemed wierd to me. Any Ideas.

 

X

xjcjfreek

NAXJA Forum User

Location

Northern BC Canada

• Jun 14, 2008

• #2

Sounds normal to me, but im just a rookie. Mine does the same. When you are in 2WD your rear driveshaft should be solid because the tranny is in gear (or park) so it puts the vehicles weight on the drivetrain. Therefore your front driveshaft (assuming its in 2WD) should have no load, and it will turn intill the ring and pinion gears make it stop.

 

9

99xjclassic

NAXJA Forum User

Location

Michigan

• Jun 14, 2008

• #3

mine does the same to omn my 99

 

Jeepm@n

NAXJA Forum User

Location

Northern, WI

• Jun 14, 2008

• #4

Best way to check driveshaft u-joints is with the wheels blocked and the transmission in neutral. This way there is no load on the axles or drive shafts. You are mainly looking for lateral movement or side to side movement. You are also looking for play between the two yokes.

 

J

Jess

NAXJA Forum User

Location

Tennessee

• Jun 14, 2008

• #5

If its not the u-joints check the tranny mount. When it starts to crack it will cause the same vibes.

 

xjtrailrider

NAXJA Forum User

NAXJA Member

Location

Roanoke VA

• Jun 14, 2008

• #6

Thats normal, the ds is just picking up slack from the backlash in the gears, slack between ring gear through the spider gears, and slack inbetween the side gears and the shafts themselves.

Don't worry about it.

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Jun 15, 2008

• #7

Yeah, thats normal backlash in the differential and xfer case. Have a look and make the u-joint itself isn't sloppy. You may still have a bad ujoint in the rear shaft that's gotten tight. Only way to really check that is to pull the shaft and see if the joints feel smooth and not sloppy.