Re: Still feeling stupid...

[tsm1@domain.elided (Tom Mandera)]

>Matt, 
>   Here is the deal. The angle of your driveshaft in relation to your
>pinion or transfer output yoke the angle should not be more than 15
>degrees. If it is then you have problems.

Now, this is a whole 'nother issue, Dan!

Here we're back to U-joint longevity.. NOT phasing and driveshaft vibrations.

If you're exceeding 15 degrees of angle in your U-joints, they'll either
*bind* on the yokes (my front does.. but it's been doing a little
"self-clearancing") or your U-joints will be toast every year (@ 15deg).

In this case, you switch to a CV-style driveshaft, and shim (or better, cut
the perches and re-weld) the axle to point the pinion directly at the t'case.

I thought the discussion was *vibrations* and the necessity of shims, vs.
*operating angles*... but I could be wrong. :-)

On a Scout II, IMO, you don't need to go CV on the *rear* until you get to a
spring-over... and even with a spring-over, you could live with regular
U-joints (you're at about 15 deg)... but a CV would last longer, and provide
about 4x the life.

A Scout 80/800 should be the same, since the 80x and II share the same 100"
WB... a few inches here or there on the rear driveshaft isn't going to make
or break tihngs... so even with a 4" lift, you should be able to keep the
pinion and t'case yokes parallel and run U-joints without vibration.

-Tom