SYE / pinion angles / rear driveshaft???????

[Bmoore2]

Hey guys, its been a while since I posted but I need some expert advise. I have an 88 Comanche with 4.0, 5 speed, around 6 inches of lift (SOA) and an 8.25.

 

First off, Saturday I snapped the eye that holds the u-joint in on the rear driveshaft just riding down the road. I know I have bad angles and have been suggested a TC drop. Since I have to buy a new drive shaft I was wondering if a SYE would help with my angles or if I should have the perches cut off and tilt the axle up to help with angles. Also should I keep the same size drive shaft?

 

Any and all help would be appreciated.

 

Bobby

[88whitemanche]

Hey guys, its been a while since I posted but I need some expert advise. I have an 88 Comanche with 4.0, 5 speed, around 6 inches of lift (SOA) and an 8.25.

 

First off, Saturday I snapped the eye that holds the u-joint in on the rear driveshaft just riding down the road. I know I have bad angles and have been suggested a TC drop. Since I have to buy a new drive shaft I was wondering if a SYE would help with my angles or if I should have the perches cut off and tilt the axle up to help with angles. Also should I keep the same size drive shaft?

 

Any and all help would be appreciated.

 

Bobby

Wouldn't a degree shim help??

But an sye is always a future investment since you have to buy a new driveshaft anyways...

[wvzj]

I would redo the spring perches and get those angles correct first. Then you could have your old shaft rebuilt or get a new one built. Any good driveline shop should be able to rebuild your old shaft.

[Incommando]

The angle of the pinion depends on your u-joints not your lift. Unless you are running a shaft with a CV joint then the pinion yoke and t-case output yoke should be parallel for the joints to work properly. You only point the pinion yoke up if you have a CV joint. People do it but it may not be right. The use of shims should be to correct changes to the yoke angle back to parralel. I don't have a link as I am on my phone but if you go to tom wood's site it explains it.

[Jeep Driver]

Study this- http://www.billavista.com/Tech/Articles/Driveshaft_Bible/index.html

[Bmoore2]

Good info Jeep Driver..... Thanks, I ordered an advanced adapter SYE and an Adams driveshaft. The fella who installed my steering and control arms said he would take care of the angles and get it set up correctly.

[Incommando]

 

Tom Wood's and BillaVista from Pirate agree. I would go with that info. At least 50% of the time the conventional wisdom that everyone just knows is right is totally wrong. Blanket statements about tilting the rear pinion up without knowing the u-joint set-up of the axle is a prime example of this.