Differential fluid flush?

Asked by Hawgwild70 Jun 07, 2012 at 11:52 AM about the 2002 Chevrolet Silverado 2500HD LT Extended Cab RWD

Question type: Maintenance & Repair

What exactly does it mean when you flush out your differential fluid?  I understand that you have to drain it out, but
what do you flush it out with?  Is synthetic fluid better to use on an older vehicle then regular gear oil?

3 Answers

trip65 answered 12 years ago

i wouldn't flush it with anything, never heard of that before . drain & fill ,make sure both surfaces are clean before you put the cover back on .

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perkinsauto67 answered 12 years ago

I don't flush. Wipe it out. If there is a bit of residue you want to get out, spray a little saftey solvent or brake clean, wipe again. I use Lucas 75W-90 Synthetic.

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