Pinion angle question

[scoots90245]

1 to 1.5 up. 3 to 4 would be a lot

shouldnt the rear axle be within 2º or less of the driveshaft angle since i have the double cardan

 

[Wes Harden]

Should be less than 2, under power. I have mine within .5 I have a slight vibration at 1950 to 2150 in overdrive, 55 to 60. Truck doesn't stay In those rpm in the other long enough to notice.

Right now that .5 is inion down. I plan on adjusting some more .5 to 1 up, but is far down the list.
After I find the best angle I might move perches to eliminate shims

 

[Wes Harden]

The reason there is no table of angles, ea set of leaf spring act differently. So ea truck needs different angle. Shorter drive shafts have steeper angles

 

[Chickntrk]

The rear axle and driveshaft should both be same angle right? I'm thinking I need 3-4º of rear axle up

Only in a two u joint shaft. If it’s a CV shaft just point the pinion in line with the shaft and the angles will be what they are

 

[Chickntrk]

Driveline Geometry 101

Driveshaft Angle Explained This video will demonstrate the proper angles for a drive shaft in a stock Jeep or Truck and how the rules change when you add a suspension lift. The video below demonstrates what is happening to the shaft at different angles, how improper angles can cause speed...

4xshaft.com

 

[scoots90245]

Only in a two u joint shaft. If it’s a CV shaft just point the pinion in line with the shaft and the angles will be what they are

I meant the rear axle pinion and Driveshaft in line both being 12º up to the rear of TC 4º down

 

[scoots90245]

The reason there is no table of angles, ea set of leaf spring act differently. So ea truck needs different angle. Shorter drive shafts have steeper angles

That makes sense
Thanks

 

[scoots90245]

I meant the rear axle pinion and Driveshaft in line both being 10º up to the rear of TC

 

[scoots90245]

Chkntrk
I Watched the TW video Thanks
Looks like I will have the TC at 4º then get the rear axle within 2º less than driveshaft angle.
I'm at 6º now with the 6º shim so ill head down to my 4x4 shop he can do the spring perch.

 

[4X4HIGH]

If its vibrating, you probably need more tilt. but make sure it's not tires or something else. At some point the shims will get kinda ridiculous and you'll want to have the perches moved. As for a chart, there's too many factors. And with leaves its better to be a degree or 2, high than low. Going down the road the leaves will twist a little bit from torque and the nose will come down a hair.

I went through all of this w/ my truck. It was like a paint shaker at 10mph. Had a normal slip shaft, got it balanced several times, no joy. Went to a double-cardan and got the angles right. Smooth as stock.

Actually the nose of the pinion will "torque" upward not down.

 

[JoshHefnerX]

You're right... My bad.