Skip the auto shop - Our mechanics make house calls

Q: Just had freeze plugs replaced.still leaks now looks oily. Transmission slipping at 10-20mph now

asked by on

After I had my freeze plugs replaced my jeep is leaking again. The leak is oily and my transmission is slipping between 10 and 20 mph

My car has 204000 miles.
My car has an automatic transmission.

A: The 4 liter engine is known for valve cover...

The 4 liter engine is known for valve cover gasket, oil pan, and rear main seal leaks. A visual inspection from a top-down approach will give you an indication of the source. I use an inspection mirror to view the rear of the valve cover for any signs of oil. Then I look for the highest origin of any oil leaks. If questionable, I will have the engine washed down, U/V dye added, and then monitored with a U/V light.

The valve cover gasket is a minor replacement. The oil pan and rear main are slightly more difficult, but should be performed at the same time as this engine has a 2-piece rear main seal, which can be changed without removing the transmission.

The transmission slipping could be anything from low fluid, age, dirty fluid, or a bad torque converter. Check the fluid condition and level. The fluid should be pink and between the hashmarks on the dipstick while warm and running in park. I believe it takes Mopar +4 fluid, but double check with a parts vendor. If you want to have this diagnosed by a professional, a technician from YourMechanic can come to your home or office to diagnose your gear slipping issue and let you know what repairs are necessary.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Clutch not disengaging

You likely need to bleed the pressure out of the hydraulic system. Improper installation could also have caused the problems. I would have a certified mechanic, such as one from YourMechanic, inspect your clutch issue and make the needed repairs...

Q: Stalling and surging

Hi and thank you for contacting YourMechanic. The best thing to do is to hook a scanner to your vehicle and retrieve any codes if possible. Yes, there is a very good possibility that your MAP sensor is faulty. The...

Q: oil hand keeps flickering had engine oil level sensor replaced

First off, we need to clarify that there is oil level and oil pressure. I'm not sure which one is flickering on your dash, but the one that is the most important to pay attention to is the Oil Pressure...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.