Do front lift springs cause castor change??? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-25-2003, 07:32 AM Thread Starter
 
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Do front lift springs cause castor change???

I just want to confirm. Assuming I keep stock shackles, if I had 2.5" lift springs on a CJ7, the castor would remain the same as stock, right?

The spring pad would still be level as before.

Just checking, I saw another post that claimed that a lift spring will change castor.
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post #2 of (permalink) Old 07-25-2003, 07:41 AM
 
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Re: Do front lift springs cause castor change???

Different springs will change the caster.
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post #3 of (permalink) Old 07-25-2003, 07:46 AM
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Re: Do front lift springs cause castor change???

i guess it would depend on the spring.

in theory, the spring would be designed as to leave caster unchanged, but without popping it on an alignment rack, you cant be 100% sure....
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post #4 of (permalink) Old 07-25-2003, 08:23 AM
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Re: Do front lift springs cause castor change???

[img]images/graemlins/40BEER.gif[/img]

You could proably buy springs that did not change your castor but as you go higher you want the pinion angle to change to allow for less angle on the u-joints. The springs usually take the pinion angle into account or the manufacturer add a wedge to help.

I would say to expect to realign your vehicle if you add new spring no matter what.

LOL,
post #5 of (permalink) Old 07-25-2003, 01:22 PM
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Re: Do front lift springs cause castor change???

You don't really want pinion angle to change. The u-joint yokes should be parallel (unless running a CV shaft), No matter what the angle of the driveshaft. If you only change pinion angle (on the diff) the angle at the t-case is still the same causing bad vibes. Yes, if the u-joint angle is too steep you will get vibes as well. This is what we live with in our SWB Jeeps. The correct way to get rid of driveline vibes in a lifted Jeep is to point the pinions at the t-case and have CV shafts made.

To answer your question, NO, new springs 'shouldn't' change pinion or caster angle, but everything is manufactured within a set of tolerances, so they might. Have it checked on a 4 wheel alighment rack after it's all together and ask them for a copy of the caster/camber/toe numbers. I've had a couple alignment shops tell me "It's all good" only to have a front tire junk in 3000 miles.
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post #6 of (permalink) Old 07-25-2003, 01:32 PM
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Re: Do front lift springs cause castor change???

When I lifted my CJ with 4 inch springs.. I couldnt drive the jeep, it was so out of wach that I could only drive 3 miles and hour withe the tires squealing the whole way, and when i drove faster the jeep was bucking like a bronco. I got it to the alignment place, they aligned ti, and it was good to go. I jsut did a spring over on the commando and i had no alignment problems at all.

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