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[TH3_#1_tracker_fan]

Ok so here's the deal. Anywhere from around 35mph and up there is a vibration/rumbling sound coming from what *SEEMS* to be the rear end of my 94 Sidekick. It doesn't happen when I'm floating the throttle (just enough to keep going), only when accelerating and especially when decelerating. It's not bad enough to where it can't be driven... In fact, I drive it every day. It's not U-Joints because they were literally just replaced. There is no looseness at the splines or either of the U-joints of the driveshaft. It's a 2WD. I'm thinking maybe clearence issues in the diff. or perhaps the pinion bearing..? Another issue I seem to be having is as long as I keep around 55-60 MPH, it stays nice and cool. However, anywhere above that and it starts heating up. I've put two thermostats in it, so I know that's not the problem. Partially clogged radiator..? Also, my 95 Geo Tracker is doing something very similar to that. I actually removed the thermostat from that and it still heats up. Normal at those particular speeds, but anywhere above and it heats up. It in particular just kind of starting doing this all of the sudden. I replaced the water pump this past winter in the Tracker. Both have a good heater, so that eliminates a stopped up heater core. I believe it too may have a partially plugged radiator or a blown head gasket... Speaking of which, I just replaced the head gasket on the Sidekick, so that kind of eliminates that, but I kind of assume that whatever blew the first head gasket probably has something to do with why it's heating up now (i bought it with a blown head gasket). Lemme know what you think.