Rear main seal leak or something else?

Asked by Mar 23, 2017 at 09:26 PM about the 1999 Ford F-250 Super Duty XL 4WD LB

Question type: Maintenance & Repair

I have a 99 ford f250. It has just under 43000 on it.
5.4 litre. I'm not very good with diagnosing engine
issues. I think the rear main seal is leaking but it
only leaks when I drive. It's not a big leak by any
means. Is there something else that could be
leaking

1 Answer

120,005

If you can live with it then wait until the leak gets worse. You must pull the transmission to fix the rear main seal. I would have a mechanic put it up on the rack and let them look for the leak.

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