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I put a new Traction lock unit and new 355 gears in my rear... I've had a few short drives maybe 100 miles total, no noises but the rear end seems to be really hot, the dif is full, but the fluid seems thin, should I be worried?
 

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Did you just now start paying more attention to the rear diff temp? I noticed that on long highway runs it was so hot you could not leave your hand on it for very long. When I asked the Rear End Specialist people in San Jose CA about this they said it was normal and that is why it has such heavy weight oil in it. John
 

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My truck rearend going down the highway at 80 mph will run 190 deg. On a lightning forum I visit another guy put a sensor in his for road racing and he said on a stock truck in will run 190 deg. with a 3:73 rearend. He said it's not uncommon to see them boil over at the road racing corse.
 
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