I haven't had a chance to do anything on it as I've been busy. The problem seemed to go away a bit the other day but now it's back to being slow.

I do have a lot of play in the rear diff as I can hear the slap in it when I abruptly let of the gas. It also makes a deep pitched sound at high speeds. Could the rear or drivetrain be slowing it down somehow? I did hear some squeeling from it the day it got a little better. Hmmm...