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Re: Driveshaft movement
When you lower a trailing arm truck the rear axle moves forward pushing the driveshaft forward. The slip yoke going into the transmission has some wiggle room there and the stock carrier bearing is rubber mounted to account for some of this movement when the suspension is compressed at stock ride height. Lowering with airbags obviously moves the driveshaft more than hitting bumps in the road at stock ride height. What is the limit? I don’t know.
For those who want to never worry about this, the fix is a billet carrier bearing and adding a slip yoke (telescoping shaft) to the driveshaft after the carrier bearing. The billet carrier bearing has no rubber mount to degrade and as such doesn’t move. To account for the movement a slip yoke is added between the carrier bearing and rear axle.
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