In a message dated 12/7/00 1:51:41 PM Eastern Standard Time, A84Westy@AOL.COM
writes:

<< I had a rebuilt Auto tranny installed about 7 months ago and have less
than 2,000 miles put on it.  Now that I've moved to hill country, when going
up hill I get a strange feeling from the rear end.  Its sort of a feeling the
the power going to the rear wheels lets go and then reengages within a
half-second or so. It may do this "trick" only once or it could be continuous
- almost to the point of having to pull over. This problem only seems to
occur going up hills and doesn't seem to matter if its warm or cold. >>

did you check the atf level?  maybe your diff fluid is low..
chris