Skip the auto shop - Our mechanics make house calls

Q: The rear main seal leaking off a '99 F-150 4.6

asked by on

I have a '99 F-150 4.6. The rear main seal has been leaking a little off the truck. It has 310,000 miles. Is it an easy fix? Should I change the transmission seal on it too?

The actual fix of taking the seal in and out once you are there is easy, but the problem is that you’ve got to move the transmission off to get to it.

So, if you are willing to do that, you might as well change the transmission seal while you are in there. Now, I had very good luck with this product AT-205 re-seal. They sell it on Amazon and I buy it all the time.

You pour it in the engine oil or in the transmission oil. It’s a polymer so it mixes with both and it can rejuvenate a bad rear or front main seal. You might just try that first. If you would like help from a professional, a technician from YourMechanic can come to your home or office to find and repair your transmission fluid leak.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Changed the fuel pump and car still won't start

Hello there. On a newer car like your 2014 Ford Taurus, the best way to begin the diagnosis of this problem is to have a professional mobile mechanic come to your location and complete a check engine light inspection. This...

Q: Car not going from park into reverse

Hi. There is a solenoid near your shifter that releases the shifter when the brake is applied. This circuit will need to be tested to determine if the brake switch, wiring, or solenoid is faulty. If you need further assistance,...

Q: Air filter housing

If you are getting oil in the air filter housing, this is from the vapor line coming from your crankcase ventilation. The oil can be from a PCV valve that is clogged and in need of replacement. The valve relieves...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.