Replace the transmission pan gasket on the 6R80 automatic transmission to repair leaks and refresh the transmission fluid.

Warnings

Tools required

Parts

• Transmission pan gasket × 1 — 6R80 transmission pan gasket
• Transmission filter (recommended) × 1 — 6R80 internal filter kit

Fluids

• Motorcraft MERCON LV ATF — 6 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow transmission to cool to ambient temperature if recently driven
3. Raise front of vehicle and support securely on jack stands
4. Place large drain pan underneath transmission pan area
5. Locate transmission pan on underside of transmission behind engine oil pan

Procedure

1. 1

   Begin transmission fluid drain
   Loosen the transmission pan bolts in a criss-cross pattern, starting from the center and working outward. Loosen bolts gradually and evenly to prevent pan distortion. Leave two bolts at opposite corners partially threaded to control pan drop. Fluid will begin draining as bolts are loosened.
2. 2

   Remove transmission pan
   Once fluid flow slows, carefully remove the remaining two bolts while supporting the pan. Lower the pan slowly to drain remaining fluid. Some fluid will remain in the pan, so keep it level as you remove it. Remove pan completely and pour remaining fluid into drain pan.
   ⚠Pan may contain 1-2 quarts of residual fluid even after draining.
3. 3

   Inspect and remove internal filter (if replacing)
   Inspect the internal transmission filter visible inside the pan cavity. If replacing, remove the filter by pulling straight down on the filter neck. The filter is typically a push-fit design. Inspect magnet in pan for metal debris - small amounts of fine dust are normal, but large chunks or excessive material indicate internal wear.
   ℹ️Excessive metal debris may indicate transmission damage requiring further diagnosis.
4. 4

   Clean transmission pan
   Thoroughly clean the transmission pan using brake cleaner and shop rags. Remove all old gasket material, RTV residue, and debris. Clean the magnet and reinstall it in the pan. Inspect pan for cracks or damage. The sealing surface must be completely clean and flat for proper gasket sealing.
5. 5

   Clean transmission mating surface
   Using a plastic scraper, carefully remove all old gasket material from the transmission housing sealing surface. Do not gouge or scratch the aluminum surface. Clean thoroughly with brake cleaner and a lint-free cloth. Ensure the surface is completely clean, dry, and free of debris before installing new gasket.
   ⚠Do not use metal scrapers that may damage the soft aluminum sealing surface.
6. 6

   Install new transmission filter
   If replacing the filter, push the new filter straight up into the transmission valve body until it seats completely. The filter should snap into place. Verify the filter is fully seated and the seal is properly positioned.
7. 7

   Install new gasket and position pan
   Position the new gasket on the transmission pan, aligning all bolt holes. Some gaskets are reusable rubber/silicone type, others are cork or fiber. Do not use additional RTV unless specified by gasket manufacturer. Carefully position the pan with gasket up to the transmission, aligning all bolt holes.
8. 8

   Install and torque pan bolts
   Start all transmission pan bolts by hand to ensure proper thread engagement. Once all bolts are started, tighten in a criss-cross pattern from the center outward to ensure even gasket compression. Torque all bolts to specification using the criss-cross pattern. Make a second pass to verify all bolts are properly torqued.
   ⚠Over-tightening pan bolts will distort the pan and cause leaks. Use a torque wrench.
   Torque spec

   Pan Bolts20 Nm (15 lb-ft)
9. 9

   Refill transmission fluid
   Lower vehicle to ground. Locate the transmission dipstick tube at the rear of the engine bay on the passenger side. Insert funnel and add approximately 5 quarts of MERCON LV ATF initially. Start engine and allow to idle in Park. Check fluid level on dipstick (engine running, transmission in Park). Add fluid in small increments until level reaches the cold range on dipstick.
   ℹ️Only check transmission fluid level with engine running and transmission in Park on level ground.
10. 10

    Complete fluid fill and check level
    With engine at idle and transmission in Park, shift through all gear positions (P-R-N-D-L), pausing 2-3 seconds in each position. Return to Park. Check fluid level again and add fluid as needed to bring level to the cold range. The transmission will require approximately 5-6 quarts total, but only what drained will need replacement.

Reassembly

1. Transmission pan bolt torque pattern is critical - always use criss-cross pattern from center outward
2. If gasket was damaged during installation, do not reuse - install a new gasket
3. Verify no tools or rags were left in work area before lowering vehicle

Verification

• Start engine and verify no leaks from transmission pan with engine at idle for 2-3 minutes
• Test drive vehicle for 10-15 minutes to bring transmission to operating temperature
• Recheck fluid level with engine running, transmission in Park, fluid at operating temperature (hot range on dipstick)
• Inspect pan area for leaks after test drive - wipe clean and recheck after sitting overnight if possible
• Fluid level should be in the hot range on dipstick when transmission is at normal operating temperature

More procedures for this vehicle