call some shops , they use a labor manual to quote usually. i cant
remember the engine you have, and am wondering what mileage is on your
car, but on my 89 g/m 5.0 . my front seal was leaking at 109,000 miles.
it wasnt much more work to go ahead and put in a new timing chain and
gears ,and it needed it too. i put new water pump in too. lucas