Check your U-joint angle as it sounds like your problem. Also for what
it is worth, there is a aftermarket kit for a AMC 20 that replaces the
weak keyed hub design with a solid hub/axle. When this is intalled the
AMC 20 is more than a match for a D44. One more thing if you are
planning a lift, a custon CV drive shaft would be very wise in a short
wheel base vehicle like yours but I would do the lift and then have
the proper length CV drive made.
-----------------
TheSnoMan.com

If a direct replacement of axles (not springs) caused a vibration, it's
likely that the final pinion angle is different on the two axles. The
centerline of the pinion shaft must be exactly parallel to the
centerline of the transfercase. You can check this with a couple of
carpenter framing squares: put the short leg of one on any mahined
surface on the back of the transfer case, the other on any machined
surface on the front of the axle. The long legs should be parallel with
each other.

If not, the fix involes adding some wedge shaped shims between the axle
and the springs.

If you are going to do a lift, you might as well wait until you get the
lift in and fix the vibrations then.

Before you go crazy replacing parts a couple things come to mind.

I don't know, likely others here do, but is the Dana 44 housing a
different length than the AMC 20?

When you set a new differential in, it is a bit tricky getting the
angles correct so you don't have vibrations.

I will try to explain.  The U-joints on the driveshaft ends have to be
parallel with each other or it will vibrate itself apart.

So this means if the plane through the u-joint at the transfer case is
say this way:  |  , then the one at the differential has to be the same
or:   |  .

If the one at the transfer case is tilted down like   / , then the other
ar the diff has to be tilted up to match or   /  .

So the driveshaft looks like   /==========/  or |==========|,  Not
/==========| which will vibrate like crazy.

This angle can be adjusted at the diff by using shims on the spring
perches or a little can be adjusted by lowering the t-case.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
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