Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by ronsantis, Oct 20, 2011.
what should it cost to have the rear main seal replaced?
I don't know but it probably depends a lot on what kind of transmission you have. Rear main seal leaks can be caused by old age, overheating and dirty oil.
My 99 also need replacing i change oil every three mnts
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