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Discussion Starter #1
I am trying to find the correct angle for my rear spring perches. The truck is an 87 runner with stock axles. I have dual cases and the Marlin 5" lift springs for the rear. Currently I have the axle housing ground smooth and was attempting to locate the correct angle. My rear driveline has a CV in it. I do not know what angles need to match. I mocked it up, and with the top of the housing being 20 degress and then set the perchs at 0, it looked ok to me. Any help would be great. I did look through the FAQ's and either missed it because I am a retard or it is not there, Thanks in advance, J.
 

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Wicked Raciest !
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Put the rear end under the truck, centered with the tires and wheels on and the the perches sitting on it.

Put the U-bolts on snugly, not tight you wat the rear end to be able to rotate.

Hook up the d-shaft.

Set it on the ground.

With a jack adjust your d-shaft angle.

Tack weld the perches.

Remove rear end and weld up.

Instructions for setting d-shaft angle:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml
 

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Discussion Starter #4
Put the rear end under the truck, centered with the tires and wheels on and the the perches sitting on it.

Put the U-bolts on snugly, not tight you wat the rear end to be able to rotate.

Hook up the d-shaft.

Set it on the ground.

With a jack adjust your d-shaft angle.

Tack weld the perches.

Remove rear end and weld up.

Instructions for setting d-shaft angle:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml

Thanks, I read that and will print it in the morning. Thank you again!
 

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FOF
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Put the rear end under the truck, centered with the tires and wheels on and the the perches sitting on it.

Put the U-bolts on snugly, not tight you wat the rear end to be able to rotate.

Hook up the d-shaft.

Set it on the ground.

With a jack adjust your d-shaft angle.

Tack weld the perches.

Remove rear end and weld up.

Instructions for setting d-shaft angle:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml
This is all I have ever done and is the best way. Can't go wrong.
 

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For the most part, I followed the method OOP's mentioned with good results. To elaborate; one additional thing I did (since I also welded on new rear spring hangers) is made sure that the distance from perch to perch matches the distance from each frame hangers... This allows for the springs to be perfectly perpendicular to the perches. Fairly simple, but very important. Also, if you have any doubt that your hangers are not equal distant from the end of the axle... re-measure. Take your time, and get it right.

If you take into account extra power (say from a bigger engine swap) being applied, you should also take into account axle wrap (where the rear pinion rotates up due to acceleration torque). Which is where I believe 85dhor got the 2 deg down from.

Read up here for more info if needed:
http://pirate4x4.com/tech/billavista/PR-shaft/index2.html
 
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