Pinion Angle Help

[Motorhead337]

I recently put a rough country lift (6 inches) on my 1991 v1500. The instructions said to position the wedge on the bottom of the leaf spring narrow end towards the center of the vehicle as well as the 2inch block. So that it would raise the pinion up. Now the pinion center line is actually well above the transfer case . the angle from the top of the driveshaft to the top of the pinion is greater than 180° The people at rough country are idiots I even sent them pics.
Any ideas?

[Irish_Alley]

post a picture of the wedge. i know i had to take a grinder to my wedge cause it wasnt flush on either side. both sides were convex

[enaberif]

Something is definitely either not installed right or you have the wrong wedge.

[ehjorten]

The first driveline drawing is absolutely wrong!!!  U-Joints need a little angle on them or they will fail.  With 0° working angle the needle bearings in the cups will not rotate and will quickly fail.  the second driveline drawing is what you want.

The pinion angle should match the angle of your transmission tailshaft.  You can sometimes angle it down a couple of degrees so that when the leaf-springs wrap-up the angle is essentially perfect.  The trouble comes when the angle between the yoke and driveshaft approaches 15°.  15° is the working angle limit of a typical U-Joint.

[Motorhead337]

Rough country insist that dropping the t case will "correct" the pinion angle. But if I drop the t case its going to make it even more like the fourth scenario in that picture.
Here's the best I can do.
As you can see both the block and wedge have taper and both are placed with narrow end towards center of vehicle

[Irish_Alley]

take the wedge out
are the blocks tapered also?

[Motorhead337]

Yes both are tapered.
 Idk how to remove the wedge. Its attached to the leaf pack with the bolt/centering pin? Either way if I could pull the wedge and leave the pin , the pin would need ground down otherwise it will not fully seat into the block.

[Irish_Alley]

the pin should be a bolt that has a round head, the round head should be able to fit inside of the block for alignment purposes. you need to put a c clamp on the spring pack (not on the springs and wedge) and get it tight then remove the bolt  the drop the wedge and reapply the bolt.
but before that i would spin the block around and see what that looks like so the taper is going the other way. maybe even tap on the wedge with a hammer and spin that around

[Motorhead337]

I'd like to retract my statement about that pin not Being able to seat fully

[Motorhead337]

I don't want to unhook everything again lol. I'm going to drop the t case and see if that helps. If not then I guess I'll have to drop the axle again

[enaberif]

I don't want to unhook everything again lol. I'm going to drop the t case and see if that helps. If not then I guess I'll have to drop the axle again

Transfer case has no relevance to the angle of the rear axle.

[blazer74]

Are the Springs marked clearly as to front side (fwd)?
You may not need the shims.
Your going to take it back apart. Doubt you'll get enough by dropping t-case down.
You would need a double cardigan joint at the t-case for that straight angle to work.
Single joint at each end requires max of 3 degrees difference of joint angle to work.


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[enaberif]

wedge is upside down and should be below the block.

[Motorhead337]

Exactly! I told the guy if anything its going to make it worse.
But he appetently never took a geometry class.
Anyhow I dropped the tcase because it'll need it anyways and the vibration is a little better now I need to fix pinion angle.
Here's what it looks like after the tcase

[Motorhead337]

I'm going to try first spinning the blocks around, then spinning the wedge around, and worse case scenario take it all back apart and remove the wedge.