Quote:
Originally Posted by 2.5Turbo
If it's only one rear wheel, I'm thinking it's a diff issue....but I don't know what in the diff it would be. They usually don't go bad; MB diffs are pretty solid.
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I agree that sounds more like a rear end problem if only one wheel is locking up. If it was linkage related, either the car wouldn't try to move, or would move the wrong way or the right way. If it was trans related, either it'll work or not work. If it was a parking or driving brake issue, it wouldn't matter whether you hand pushed it or tried to drive it, the wheel would still lock up. A rear diff problem however, can cause one side to bind & change with load as the gears try to "wind up" on each other, a missing tooth on a gear can cause a misalignment and bind, or a bad bearing could allow a shaft (pinion or carrier) to skew and bind under load in reverse. They are helically cut teeth, so they will behave differently depending on which way they are loaded by the engine, and you may not feel it if a tooth is broken when going down the road. You may also have a bad spider gear (the one that the axle spline slips into). I would grab the pinion shaft right where the driveshaft flexjoint is and try to wobble it around (with no load on the driveline, including the vehicle locking against it in park) If it has any wobble you can feel or see, thats a bad thing. If that's ok, pop the rear cover and inspect the insides for wobble slop or damage/loose pieces floating around in the oil. You probably needed to change the diff fluid by now anyway,lol. Probably wouldn't hurt to check the hub bearings and flex shaft joints either on the suspect wheel, they can also cause this.