Setting pinion angles

Cottontail · Feb 21, 2015

So, if I understand correctly, this angle off my 8.8 is 17* up.

And this, the angle off my slip yoke eliminator yoke is 5* down.

The two should be within 1* of each other, which means that my axle needs to be rotated down about 11-12*. Is that correct?

md21722 · Feb 21, 2015

Since you have a SYE with a double cardan driveshaft, the pinion angle should be at, or 2 degrees lower than the driveshaft angle. Hang the angle meter on the driveshaft itself. The angle of the SYE yoke is more or less irrelevant unless you are worried about exceeding the angle of the double cardan joint itself. Its unlikely unless you have a ridiculous lift.

Cottontail · Feb 21, 2015

Tell me more. I'm at about 5.5".

Where on the drive shaft am I taking readings, and what reading am I looking for?

Also I currently have 6* of shim on the rear axle because once when I thought I was doing pinion angles correctly I calculated that I needed that. Now I'm not sure and am chasing driveline vibrations at highway speed.

md21722 · Feb 21, 2015

Put the magnetic base of the angle meter directly on the bottom of the driveshaft, so the angle meter is facing down towards the ground. Right in the middle of the driveshaft is fine. Whatever that number is, you want your pinion to be the same, or 2 degrees lower. Some people like to allow 2 degrees for axle wrap and some say just make it exactly the same. And some say both at the same time. If you PM me a cell number I will text you some pictures.

cal · Feb 21, 2015

Cottontail said:
Tell me more. I'm at about 5.5".

Where on the drive shaft am I taking readings, and what reading am I looking for?

Also I currently have 6* of shim on the rear axle because once when I thought I was doing pinion angles correctly I calculated that I needed that. Now I'm not sure and am chasing driveline vibrations at highway speed.

Like this. You want the 2 lines to be 2-4 degrees apart from each other.

olysteve · Feb 22, 2015

I thought that wuth a double cardan driveline you wanted the driveline to be within 1 degree of the rear yoke

cal · Feb 22, 2015

If you never got any axle wrap, yes. But the pinion always turns up a few degrees when you're on it. The more flexy your leafs, the more wrap you get.

Cottontail · Feb 22, 2015

Thanks for all the response. I got mine measured correctly finally and I am 2* off so that is right in the tolerance level.

Thanks to md21722 for texting me a bunch of pictures.

Setting pinion angles

Cottontail

Three-De Off-Road

md21722

NAXJA Forum User

Cottontail

Three-De Off-Road

md21722

NAXJA Forum User

cal

NAXJA Forum User

olysteve

NAXJA Forum User

cal

NAXJA Forum User

Cottontail

Three-De Off-Road

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