Pinion Angle at Zero with WH Wrap Trap?

[Ol'Blue]

Installing WH Wrap Trap and heavy duty leaf spring perches. Should I go with the 1-2 degrees in pinion angle or set to zero degrees since I shouldn't have any wrap now?

Thanks,

 

[Ol'Blue]

Also, how far back will the axle move under compression? I’ve only got about 3/4” between the anti wrap bracket and the frame.

 

[Broncobowsher]

The link won't grow. Only so much bushing deflection is going to happen. While it looks close, I don't see how that could get into the crossmember.

As far as having no axle wrap, you will still have some. But it will be controlled. Bushings will still squish. Springs will still flex. Driveshaft angles will still change during suspension cycling. As to what angle to set to? Somewhere around there is right. Dead straight is known to be bad. That is generally an issue in multi-piece driveshafts running a straight line through a joint. I have also seen it in IRS cars that have a chassis mounted diff in a perfect straight line with the shaft. The suspension is going to move around, the angle should change, that will move the needle bearings around and that is all that is needed. Have you checked what the lateral angle of the driveshaft is going to be? U-joints don't only work in a longitudinal bend, there can be lateral bend as well. You will get even more lateral if you articulate the rear suspension as you get roll steer and the compressed side of the leaf spring pushes the axle back and the arc of the drooping spring pulls that side forward.
I don't over think driveshaft U-joint angles any more. Double cardon at the transfer case, point the pinion pretty close to the transfer case and call it a day. Without a double cardon, I do pay a little more attention to matching the angles.

 

[nvrstuk]

The general consensus here on CB for the last 3 decades has been 1-2 degrees below the piniion and since you're setting it up, set it there. No sense guessing.

Tom Woods I noticed (Driveshaft builder) even mentions it on his website now. Like Bowsher said, needles don't like not having rotation so 1-2 deg is it.

 

[Ol'Blue]

Thanks for the help gents. 1-2 deg it is and tack welding everything up today. Cant wait to see the results.

 

[ntsqd]

Add in that UJ's need to move a little. One that is perfectly straight will have a very short life-span.