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Ted G.
Ted G., ASE Certified Technician
Category: Ford
Satisfied Customers: 6090
Experience:  20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
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I have a ford fwith a 9 3/4 rear,the pinion seal leaked and

Customer Question

I have a ford f(###) ###-####with a 9 3/4 rear,the pinion seal leaked and I replaced it and also noticed that it runs hot,between 130 and 160 F,Do I have a problem?What should the rear temp be?Sometimes I can here a hum.jude
Submitted: 1 year ago.
Category: Ford
Expert:  Ted G. replied 1 year ago.

It is going to build some heat, especially on the highway, that temp is fine. The hum may be due to a gear lash problem and wear. If the hum is present when accelerating or pulling but not on coast then it is gear wear. Usually nothing to be concerned about until it gets really annoying. Then the rear has to be rebuilt.