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i recently put a skyjacker ifs 4' lift on my truck, was just wondering if i should run stock ball joints or if there is a better ball joint that i should run? Also after i installed the lift i noticed a vibration while i was accelerating but then when i stopped or pushed in the clutch it went away. I talked to skyjacker and they said that i could use my original driveshaft. Would i need to rebalance my shaft or is it possible that my pinion angle is off? I KNOW IFS SUCKS but the lift i paid 600 for with new leafsprings.
 

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In my experience, Skyjacker leaves something to be desired when it comes to engineering. I'd guess that your rear shaft is out of alignment. I hope it's not a "softride" set, or it will be a 2" lift in a few months. On the rear axle I believe skyjacker uses shims. I'd guess that they are the same shims they use for a std minitruck which IIRC has a longer wheel base. The truck uses a two piece rear shaft with a carrier bearing, I dont recall what a early 4runner uses. You may be able to solve your problem by shimming the carrier bearing position to compensate.

If balance is a problem, it should continue when you let off the power/push in clutch. If it's a alignment problem it may be increased under power as the pinion will rotate up a degree or two, applying force to the shaft will take up any slack such as worn joints etc. that may hide the vibration.

good luck
 
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