This can be done ONLY if you have a CV joint driveshaft.

If you're running a standard drivehsaft, the 2 u-joints on the shaft
must be in phase.

That means, if your flange at the t-case is pointing like this:

(viewed from driver's side)

o --> 2 degrees that way (at the top)
|
o <-- 2 degrees in the other direction (bottom)

(at least you HOPE they are equal ;))

Then the flange at the differential should point in the exact same
direction as the u-joint at the t-case. That means that the top of the
flange should point 2-degrees rearward and the bottom of the flange
should point 2-degrees frontward.

While this is in a "perfect world", the set-up will sometimes result
in binding of the u-joints. If you push up the flange of the
differential, you can prevent the binding, but your u-joints are no
longer in phase. This will cause possible vibration, and shorter
u-joint life.

Tom Wood's web site explain all of that in great detail, much better
than I can.

http://www.4xshaft.com/driveline101.html

The way I understand it... If you raise the pinion 2 degrees (measured
at the flange), you should LOWER the t-case until you get 2-degrees at
the t-case flange.

JP

"Fletcher" <no@mail.com> wrote in message news:
> Ok this brings me to a second question. I recently picked up a dana 44 from
> a scout that I need to gear and lock up before I install. The spring
> perches are not quite right so they need to be moved anyways. What if I
> weld the perches so that the axle is slightly rotated in an attempt to help
> straighten the driveline angles. Any issues with this?

 

This can be done ONLY if you have a CV joint driveshaft.

If you're running a standard drivehsaft, the 2 u-joints on the shaft
must be in phase.

That means, if your flange at the t-case is pointing like this:

(viewed from driver's side)

o --> 2 degrees that way (at the top)
|
o <-- 2 degrees in the other direction (bottom)

(at least you HOPE they are equal ;))

Then the flange at the differential should point in the exact same
direction as the u-joint at the t-case. That means that the top of the
flange should point 2-degrees rearward and the bottom of the flange
should point 2-degrees frontward.

While this is in a "perfect world", the set-up will sometimes result
in binding of the u-joints. If you push up the flange of the
differential, you can prevent the binding, but your u-joints are no
longer in phase. This will cause possible vibration, and shorter
u-joint life.

Tom Wood's web site explain all of that in great detail, much better
than I can.

http://www.4xshaft.com/driveline101.html

The way I understand it... If you raise the pinion 2 degrees (measured
at the flange), you should LOWER the t-case until you get 2-degrees at
the t-case flange.

JP

"Fletcher" <no@mail.com> wrote in message news:
> Ok this brings me to a second question. I recently picked up a dana 44 from
> a scout that I need to gear and lock up before I install. The spring
> perches are not quite right so they need to be moved anyways. What if I
> weld the perches so that the axle is slightly rotated in an attempt to help
> straighten the driveline angles. Any issues with this?

 

This can be done ONLY if you have a CV joint driveshaft.

If you're running a standard drivehsaft, the 2 u-joints on the shaft
must be in phase.

That means, if your flange at the t-case is pointing like this:

(viewed from driver's side)

o --> 2 degrees that way (at the top)
|
o <-- 2 degrees in the other direction (bottom)

(at least you HOPE they are equal ;))

Then the flange at the differential should point in the exact same
direction as the u-joint at the t-case. That means that the top of the
flange should point 2-degrees rearward and the bottom of the flange
should point 2-degrees frontward.

While this is in a "perfect world", the set-up will sometimes result
in binding of the u-joints. If you push up the flange of the
differential, you can prevent the binding, but your u-joints are no
longer in phase. This will cause possible vibration, and shorter
u-joint life.

Tom Wood's web site explain all of that in great detail, much better
than I can.

http://www.4xshaft.com/driveline101.html

The way I understand it... If you raise the pinion 2 degrees (measured
at the flange), you should LOWER the t-case until you get 2-degrees at
the t-case flange.

JP

"Fletcher" <no@mail.com> wrote in message news:
> Ok this brings me to a second question. I recently picked up a dana 44 from
> a scout that I need to gear and lock up before I install. The spring
> perches are not quite right so they need to be moved anyways. What if I
> weld the perches so that the axle is slightly rotated in an attempt to help
> straighten the driveline angles. Any issues with this?