Rear Thrust Angle?

jmark · **Posted:** Fri Aug 12, 2011 11:22 am

Took my KJ in for an alignment (was tracking left about 3500 after putting my franky in)

Apparently the thrust angle is off by .34 .. I know theres no adjustment for this, would rusty's arms help?

http://rustysoffroad.com/mm5/merchant.m ... _Code=ARMS

Rear toe is .56 left and .21 right

Attempted to remove the Rear swaybar when i did the lift only to find the bolts so rusted i snapped one off (passenger side) could this be the cause? I did get into an accident about 9 months ago, however the thrust angle has been in spec before and after that (and it was measured out on the frame machine, no unibody tweak)

Could it also be the bushings? if so, i'll just swap those, i dont want to throw parts at a problem if i can avoid it.

RED_KJ_666 · **Posted:** Fri Aug 12, 2011 4:29 pm

It's very possible that Could be your problem. Might be the Rear lower control arm Bushings, or the upper Y-link Bushings at the Frame end. Mine where all beat out when I removed the rear.

surfRenegade · **Posted:** Fri Aug 12, 2011 5:18 pm

oh...i thought this topic was more along the line of whats going on in RED_KJs avatar pic...nevermind :lol:

tommudd · **Posted:** Fri Aug 12, 2011 6:07 pm

My first thought would be LCA bushings as well. Mine are loose enough that you can feel it, have another set laying here just need to install them. You don't need the Rustys ones, just stock ones work fine
Like Red KJ stated though check the upper as well, mine went at about 120,000 or so

tjkj2002 · **Posted:** Fri Aug 12, 2011 7:51 pm

Well since both #'s are positive toe you have something bent and most likely the axle tubes.If one was negitive and the other positive that would mean a mis-aligned axle.

jmark · **Posted:** Fri Aug 12, 2011 7:54 pm

The odd question is what would cause them to bend if that is indeed the case.

tjkj2002 · **Posted:** Fri Aug 12, 2011 8:02 pm

jmark wrote:

The odd question is what would cause them to bend if that is indeed the case.

Overloading the KJ or towing to much.Hitting curbs,hitting potholes to fast,overheated rear diff,and many other things can cause this.No real fix either unless you have a good offroad shop that can re-tube or straighten the tubes(requires truss afterwards or will bend again real easy).

jmark · **Posted:** Fri Aug 12, 2011 11:03 pm

CORRECTION:

Messed up the alignment numbers, here they are

BEFORE:

Front:
Camber LF: -1.0 RF 0.8
Caster LF 1.9 RF 2.9
Toe LF: 0.13 RF 0.09
Total Toe: 0.22
Steer Ahead: 0.02

Rear:
Camber: LR: -0.3 RR: 0.0
Toe: LR: 0.62 RR: -0.24

Thrust Angle 0.43

After Alignment:
Front:

Camber LF: -0.3 RF -0.7
Caster LF 2.6 RF 3.0
Toe LF: 0.07 RF 0.12
Total Toe: 0.19
Steer Ahead: -0.03

Rear:
Camber: LR: -0.2 RR: 0.0
Toe: LR: 0.57 RR: -0.21

Thrust Angle 0.39

Thanks again for the information, so it seems like something is crooked?

streetglideok · **Posted:** Sun Aug 14, 2011 11:56 pm

Rear axle is pointing to the right a little bit. Will make the front of the vehicle point left while dogtracking down the road. Alot of solid axle rear vehicles arent straight back there. Could be a bushing allowing the right side of the rear end to set back, or a tweaked arm on the left side pulling the driverside forward. Camber looks good, so doubt the axle tubes or the rear end in general are bent. Looks like it should drive straight otherwise, angles are such that it would counter road crown.

RED_KJ_666 · **Posted:** Mon Aug 15, 2011 12:12 am

Did you find the Issue yet?

jmark · **Posted:** Fri Aug 19, 2011 12:32 am

checking it out this weekend, also looks like im due for front CVs and intermediate shaft :-/ need part numbers and pricing on that stuff, kind of dreading that project.

JeepinJarhead03 · **Posted:** Fri Aug 19, 2011 12:34 am

erics has the intermediates
i can't remember what the website/phone number is for erics

napa has the REMANNED cv's
do NOT get the new cv's they're the wrong length

Rear Thrust Angle?

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