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What is a pinion seal and what does it do? Generally speaking, how many shop hours does it take to change? I have a diesel F-350.

Answers from the Automotive Experts

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Lene, The pinion seal is where the drive shaft goes into the differential. It keeps the fluid in the differential...which is what keeps the gears of your rear wheels rolling smoothly. I found this pretty good article that describes the procedure: You can also check to find out what this job should cost. Hope this helps. Lori Johnson

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