rear end pinion angle issues

[Lookin4the1]

i'll be checking on tuesday/wednesday. unfortunately the truck and I don't share the same physical address as my work makes me travel. I'm going to take it apart at the slip shaft and line everything up. i read that < 3 degrees is ok and that I'm just to take a inclinometer and measure on top or bottom of each u joint cup. anything else i should look for?

[mongocanfly]

Yep..3 deg down on trans ..3 deg up on rear diff

[Keith Seymore]

Originally Posted by Lookin4the1

i'll be checking on tuesday/wednesday. unfortunately the truck and I don't share the same physical address as my work makes me travel. I'm going to take it apart at the slip shaft and line everything up. i read that < 3 degrees is ok and that I'm just to take a inclinometer and measure on top or bottom of each u joint cup. anything else i should look for?

...

http://67-72chevytrucks.com/vboard/s...d.php?t=522180

K

[Lookin4the1]

after checking the angles and phasing. they are all correct. What i did notice was something much simpler. I made my own set back place and I believe I made them too short. I'll take some better pictures tomorrow morning.

What I think is happening is under acceleration the rear end rotation upward what would be an acceptable amount nut it basically falls off the back of the setback plates. when i built them i basically did a 2.5" x 5" plate on top of the leaf spring, cut the hole out so it would sit flush and then welded in a 5/8" round stock bar to fit inside the perch. the plate ends about 1/4" after the round stock I welded in so half of the perch on the rear end axle is not touching anything.

[mongocanfly]

Sounds like you may have found the problem..