JL Rubicon caster measure

[AnnDee4444]

center to center the above dimensions look about right... hard to measure with one arm mounted. Picture attached!

Part number is correct for the Mopar arms...

And no lift? Did the rake change significantly? Lots of junk in the trunk?

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[Tsalvador]

Part number is correct for the Mopar arms...

And no lift? Did the rake change significantly? Lots of junk in the trunk?

man - dry, empty.

only change - the 35’s

Im thinking they do impact the geometry and hence the no change?

 

[AnnDee4444]

man - dry, empty.

only change - the 35’s

Im thinking they do impact the geometry and hence the no change?

No, there's no way for just the tire size to change the camber/caster/toe (unless you have staggered sizing, a really heavy spare, or the axle bends from the added stress).

 

[Tsalvador]

No, there's no way for just the tire size to change the camber/caster/toe (unless you have staggered sizing, a really heavy spare, or the axle bends from the added stress).

thats a negative there.Mystery continues.

heading back tô the shop - to review the whole thing again!

 

[DOOKEY]

thats a negative there.Mystery continues.

heading back tô the shop - to review the whole thing again!

Go to a different alignment rack.

 

[Tsalvador]

Go to a different alignment rack.

So mystery has been solved. the longer LCA's are in and the caster actually measured at a new place, put the jeep at 5.8. right pull was still there.

went to a fantastic guy here in texas.... longer lca's in place but not adjustable UCA's. the improvement is felt and caster now slightly above 6. next will be a fine tuning. surprisingly the difference with caster hitting the 6 mark.... and minor fine tuning now with the UCA's to prob sit at around 6.2-6.3.

now, finally enjoying the experience.

 

[jlang]

OK, reviving this as my steering is a bit "flighty" on the highway. In other words, loose steering is how I would describe it. This is what my angle finder reads on the pumpkin on both sides. What am I looking at?

 

[DOOKEY]

The wrong thing. Caster is measured at the knuckle and while the housing and knuckles share a relationship you're best to measure the ball joints. Or stick it on an alignment rack.

 

[Moto_21]

OK, reviving this as my steering is a bit "flighty" on the highway. In other words, loose steering is how I would describe it. This is what my angle finder reads on the pumpkin on both sides. What am I looking at?

If its sloping backwards 8 degrees, if its sloping forwards 4 degrees

what dookey said… best way

 

[Roky]

OK, reviving this as my steering is a bit "flighty" on the highway. In other words, loose steering is how I would describe it. This is what my angle finder reads on the pumpkin on both sides. What am I looking at?

You’re looking at 4 ish degrees.

 

[AnnDee4444]

Page 1 explains it well: https://www.jlwranglerforums.com/forum/threads/jl-rubicon-caster-measure.25691/#post-639223

 

[jlang]

OK, I think I got it...Im basically 2 degrees at diff (90-88.1 = 1.9) so 4.1 caster?

If this is accurate, would it explain the "flighty", loose steering?

 

[Moto_21]

OK, I think I got it...Im basically 2 degrees at diff (90-88.1 = 1.9) so 4.1 caster?

If this is accurate, would it explain the "flighty" steering?

Somewhere around there, yes

 

[DOOKEY]

OK, I think I got it...Im basically 2 degrees at diff (90-88.1 = 1.9) so 4.1 caster?

If this is accurate, would it explain the "flighty", loose steering?

That amount of caster would explain it. Reference for the future... take your Jeep to an alignment rack with your angle finder. When it is on their rack put your angle finder in the same place and record it for later. Then you will always know the angle difference between the diff and the knuckles.

 

[Roky]

OK, I think I got it...Im basically 2 degrees at diff (90-88.1 = 1.9) so 4.1 caster?

If this is accurate, would it explain the "flighty", loose steering?

yes

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