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Old 11-08-2015, 03:47 PM
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caster angle

I was wondering what the caster angle should be an my TJ. I have adjustable upper CA's and can change it easily. I was thinking, I could put and angle finder vertical on two diff cover bolts and set the pinion angle, therefor (if nothing is bent) the caster should be right. What do ya'll think? If this is correct thinking what is the correct pinion angle?

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Old 11-08-2015, 03:58 PM   #2
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You want to measure from the two flat spots on the rear end on each side of the pumkin to measure caster then measure the drive shaft angle. What kind of driveshaft are you running? is it a cv with sye ?

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Old 11-08-2015, 04:01 PM   #3
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Old 11-08-2015, 06:43 PM   #4
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You cannot use an angle finder to measure caster because the angle will change depending on the slope of the surface the Jeep is sitting on. Your front drive shaft is a double cardan drive shaft and pinion angle should take precedence over caster. Point your pinion at the fixed yoke on the t-case.

If you want to determine caster angle, take the Jeep to an alignment shop and have it checked. Then park it where you always work on it and check the pumkin flats with your gauge to determine the difference.
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Old 11-08-2015, 07:14 PM   #5
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Quote:
Originally Posted by andy05jeep View Post
You want to measure from the two flat spots on the rear end on each side of the pumkin to measure caster then measure the drive shaft angle.
That's how to measure the axle's pinion angle, not the front axle's caster angle.

Jayjeep, the factory caster angle is 7 degrees though the exact caster angle is not critical, there just needs to be "enough" caster angle. And there's no easy repeatable way to measure the TJ's caster angle, that's the one angle measurement I leave to an alignment rack.

Though if the steering has good return-to-center, the caster angle is probably fine. That just means if the steering wheel returns to center after a turn and it steers pretty steadily on the highway without needing constant steering correction, the caster angle is probably fine.
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Old 11-09-2015, 07:52 AM
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Thanks for the info. The jeep drive good down the road, return to center a little slow, makes me want to help it sometimes. At very slow, tight turns on pavement I can feel the inside wheel wobble ever so lightly, any thoughts.

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