Confused about setting rear pinion... help please

[jimmy18thing]

I just installed a new lift, also I have cut off my old perches (they were shot) got new ones to weld in, I am just a little confused on how I am supposed to determine the angle. I have searched on here and I am just not quite grasping it. I thought it was supposed to be basically parallel with the output shaft on the transfer case, but I think it is supposed to be different due to the double U-joint on the upper half of the driveline... Help please....

 

[4lofun]

the pinion angle should be same as driveshaft angle with a double carden cv shaft. 15 degrees i believe is the area

 

[r36130]

set it as close to 0 degress as you can. no angle on the u joint.

 

[77BRONKOTN]

Assemble new perches onto the axle and tighten things up. I like to have the vehicle weight pushing down when doing this.

Hook up driveshaft.

Measure drive shaft angle.

Measure pinon angle.

Subtract the two.

You want to be around -2 degrees pinon angle. The pinon will raise during acceleration. Anymore angle or less you will have vibration.

Tack weld the perches when your close.

Take apart and weld it up.

Recheck things once its back together.

 

[TBS-POPS]

Since not all springs sit the same, the best thing to do is put the axle under with the perches loose, and mock things up with the weight of the EB on the axle. Move the pinion up or down so the pinion is pointing at the t-case yoke. driveshaft in line with pinion or a couple of deg down is ok.

Rule of thumb on lifted broncos is when welding on perches, 20-22 deg up on pinion angle with perches level. a good start when tacking them on on the bench.

 

[Viperwolf1]

Since not all springs sit the same, the best thing to do is put the axle under with the perches loose, and mock things up with the weight of the EB on the axle. Move the pinion up or down so the pinion is pointing at the t-case yoke. driveshaft in line with pinion or a couple of deg down is ok.

Exactly. Easiest and most effective way.

 

[brewchief]

Good driveshaft tech here, including pics on how you want to set the angles
http://www.pirate4x4.com/tech/billavista/PR-shaft/index.html

 

[Steve83]

If there's a Double-Cardan joint in the d'shaft, the pinion should be in line with the d'shaft. If no DC, the pinion should be parallel to the crankshaft/trans pan/t-case.

 

[broncnaz]

Here's another link that may help. http://classicbroncos.com/tech/measure-pinion-angle