rear main seal on 1998 Chevrolet Tahoe

while driving my tahoe leaks oil badly, it drips onto exaust pipes and smells terrible. i think it is the rear main seal. It does not leak while parked

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1 answer
If its coming from with in the bell housing you may be correct. You may need to wash down the engine to pinpoint the leak. A garage may look for a leak using dye in the oil, or using a smoke machine oil generate smoke through the dipstick tube and plugging of any engine vents to see where the smoke leaks out.