So we are going through this northeaster right now and I just had to take my 88" to work today (arm twisted ).
With the roads so bad, I had to leave it in four-wheel drive while keeping it in a controlled slide most of the way to the office.
Then all of a sudden there was a thunk. A loud thunk. A thunk that sounded like a hammer against one of the gears in the transfer case. It occurs once every 200 feet or so and only when going above 25 mph while the engine was under load going up hill (but not down hill). Also, if going up a steep hill at speed the rear end felt like it was kicking out a bit right when the thunk happened. As if the rear end had just stopped momentarily.
It didn't happen under full lock in the covered parking garage at work but the truck did hop a bit as it should. So I know four wheel is working and that pressure build up in the transfer case doesn't make that sound at low speeds.
Any ideas? I'm thinking that it's a bad gear in the rear end transferring the pressure into the transfer case but only after a momentary lockup of the rear wheels.
Cheers,
Tim
With the roads so bad, I had to leave it in four-wheel drive while keeping it in a controlled slide most of the way to the office.
Then all of a sudden there was a thunk. A loud thunk. A thunk that sounded like a hammer against one of the gears in the transfer case. It occurs once every 200 feet or so and only when going above 25 mph while the engine was under load going up hill (but not down hill). Also, if going up a steep hill at speed the rear end felt like it was kicking out a bit right when the thunk happened. As if the rear end had just stopped momentarily.
It didn't happen under full lock in the covered parking garage at work but the truck did hop a bit as it should. So I know four wheel is working and that pressure build up in the transfer case doesn't make that sound at low speeds.
Any ideas? I'm thinking that it's a bad gear in the rear end transferring the pressure into the transfer case but only after a momentary lockup of the rear wheels.
Cheers,
Tim
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