Caster reference points? - JeepForum.com
 
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post #1 of 7 Old 02-04-2019, 11:22 AM Thread Starter
SeanCucf
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Caster reference points?

Whatís everyone use as a reference point for caster? Does it even matter? I donít have a flat enough driveway(no garage). Is there a point on the frame rails which is a good zero? If weíre talking 1-2į making a difference, I canít trust the ground, or the poorly worn tires to be accurate. Heck, Iím not even sure I can trust any of the cast surfaces on the knuckles either. Tops of the ball joints?

Iíve read to set as much caster as you can while focusing first on pinion angle for driveline vibes.

What say the experienced?




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post #2 of 7 Old 02-04-2019, 11:55 AM
biffgnar
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IMO tough to accurately measure at home. One option is to put it on the rack and get a real number. Then measure your pinion angle which is much easier to do. The relationship between those two is a constant as long as axle remains the same so in future if you make adjustments then you re-measure the pinion and do the math to know caster. Or you can just take the approach that knowing an exact number really does nothing for you and as long as you can live with driveability at the point where you have the most caster possible without driveline vibes then all is good.
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post #3 of 7 Old 02-04-2019, 12:15 PM
Shark_13
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There is approx 12 degrees of separation between the pinion angle and caster angle.
Go find a level spot to park and you should be "close enough" to know if you have 3 degrees or 6 degrees.

Obviously, the best way is to get the numbers from an alignment shop if you want accurate.

The two flat spots on the front of the diff on either side of the pumpkin is the same angle as the pinion.
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post #4 of 7 Old 02-04-2019, 12:31 PM Thread Starter
SeanCucf
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Heard. Thanks.


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post #5 of 7 Old 02-04-2019, 03:54 PM
btn
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I’ve always had good luck putting a socket on top of the upper ball joint and an angle finder on top of it. Of course, make sure Jeep is parked on 0 degree ground first.

2000 TJ, 4.0L, 4" suspension lift, 35s, rear D44 and front HP30 both with ARBs. AX15, 4:1 T-case.
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post #6 of 7 Old 02-05-2019, 08:05 AM
danb303
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Does lowering the pinion increase the caster?

2006 LJR Auto. 35" tires, 538 gears, IRO 4"lift. Tom Woods! JKS TB, Rancho 5000x, Currie Correctlync
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post #7 of 7 Old 02-05-2019, 08:08 AM
biffgnar
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Quote:
Originally Posted by danb303 View Post
Does lowering the pinion increase the caster?
Yes. They are a direct trade off.
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