Not hard at all. Actually, there's 6 valve covers. The plate cover comes
off with two bolts, then each valve cover comes off with a single bolt.
There's not a whole lot of room for the #6 cover, but there's enough to tip
it to the side (passenger) and and remove it.
That Dana 70 axle is a little more difficult to work with, because of the
use of shims. If you haven't done a differential swap before, I'd leave it
to a shop. If you want to tackle it yourself, read through a post from
Steve Belt here - about 2/3's down the page, the message with the subject
'4.56 gear installation info':
By changing the pinion gear of the sending unit on the tailpiece of the
transmission (I'm assuming you have a 2WD, because you were only asking
about a rear diff. swap. On a 4x4, the sending unit is on the transfer
case). Since a 3.55 gear was also standard equipment on your truck, your
Dodge parts counter should be able to look up the correct pinion gear for
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