Transmission Pan Gasket

Remove and replace the transmission pan gasket on a 2008 Dodge Viper with Tremec T56 6-speed manual transmission, including fluid drain and refill.

Warnings

Tools required

Parts

• Transmission pan gasket × 1 — Use OEM Mopar gasket or Fel-Pro equivalent
• RTV silicone sealant (if specified by gasket manufacturer) × 1 — Use OEM specification

Fluids

• Pennzoil Synchromesh 75W-90 — 4.2 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow transmission to cool completely if vehicle has been driven
3. Raise vehicle on lift or securely support on jack stands at all four corners
4. Verify vehicle is stable and will not shift during work
5. Position drain pan beneath transmission pan

Procedure

1. 1

   Access transmission pan
   Locate the transmission pan on the underside of the Tremec T56 transmission. It is a stamped steel pan located at the bottom of the transmission case, forward of the driveshaft and between the frame rails. Inspect the area for any debris or obstructions.
2. 2

   Loosen pan bolts in sequence
   Beginning at one rear corner, loosen but do not remove all transmission pan bolts. There are 17 bolts securing the pan perimeter. Loosen bolts in a criss-cross pattern to prevent warping the pan flange. Leave two bolts at opposite corners lightly threaded to support the pan.
   ⚠Fluid will begin seeping from the gasket joint as bolts are loosened. Keep drain pan positioned to catch fluid.
3. 3

   Drain transmission fluid
   With drain pan properly positioned, carefully remove the remaining two support bolts while supporting the pan with one hand. Lower the pan slowly, allowing fluid to drain completely. The pan will contain approximately 3-4 quarts of fluid. Tilt pan as needed to drain all fluid into the catch pan.
   ⚠Pan may be heavy with fluid weight. Use controlled motion to prevent spills.
4. 4

   Remove transmission pan
   Once fluid has drained, fully remove the transmission pan. If pan is stuck to gasket, gently tap with rubber mallet or carefully pry with plastic scraper at a corner. Do not use excessive force or metal tools that could damage the sealing surface. Set pan aside on clean work surface.
5. 5

   Inspect transmission internals
   With pan removed, visually inspect the transmission filter screen (if equipped) and interior of transmission case. Look for excessive metal particles, shavings, or debris that could indicate internal wear. Normal fine metallic residue on the magnet inside the pan is acceptable. If excessive debris is found, further transmission inspection may be required.
6. 6

   Clean transmission pan
   Thoroughly clean the interior and exterior of the transmission pan using brake cleaner or degreaser. Remove all old gasket material from the pan sealing surface using a plastic gasket scraper. Ensure the magnet (if present) is cleaned of metallic debris. Clean all bolt holes and inspect pan for damage, cracks, or warping. The sealing surface must be completely clean and flat.
7. 7

   Clean transmission case mating surface
   Carefully clean the transmission case pan rail sealing surface, removing all old gasket material. Use a plastic scraper to avoid gouging the aluminum case. Wipe surface clean with brake cleaner and lint-free shop rag. Ensure no gasket fragments fall into the transmission case. The mating surface must be completely clean, dry, and free of debris.
8. 8

   Install new gasket
   Position the new transmission pan gasket onto the clean pan sealing surface. Some gaskets are adhesive-backed and will stick to the pan; others may require a thin bead of RTV silicone at the corners only (consult gasket manufacturer instructions). Ensure all bolt holes in the gasket align with pan bolt holes. Do not use excessive RTV as it can squeeze into the transmission and cause damage.
9. 9

   Install transmission pan
   Carefully raise the transmission pan with gasket attached up to the transmission case. Align all bolt holes and start all 17 pan bolts by hand to ensure proper alignment. Do not cross-thread bolts. Once all bolts are hand-started, snug them finger-tight in a criss-cross pattern to seat the gasket evenly.
10. 10

    Torque pan bolts to specification
    Using a torque wrench, tighten all 17 transmission pan bolts to 12 ft-lb in a criss-cross pattern, working from the center outward. Make multiple passes, gradually increasing torque (6 ft-lb, then 12 ft-lb) to ensure even gasket compression and prevent warping. Do not overtighten as this can crush the gasket or warp the pan.
11. 11

    Refill transmission with fluid
    Locate the transmission fill plug on the side of the transmission case. Remove the fill plug using the appropriate hex/Allen wrench per factory spec. Using a fluid pump, add approximately 3 to 3.5 quarts of the factory-specified transmission fluid through the fill hole. Fill until fluid begins to seep from the fill hole with vehicle level. Reinstall and tighten fill plug.
12. 12

    Check for leaks
    With vehicle still raised and supported, wipe the transmission pan area clean. Start the engine and allow it to idle for 2-3 minutes. Shift through all gears with clutch depressed while stationary. Inspect the entire pan gasket perimeter for any signs of fluid seepage. If leaks are present, shut off engine, allow to cool, and verify proper bolt torque.

Reassembly

1. Lower vehicle from lift or jack stands once leak inspection is complete
2. Dispose of used transmission fluid at appropriate recycling facility
3. Clean any spilled fluid from under vehicle and garage floor

Verification

• No fluid leaks visible around transmission pan gasket after test drive
• All 17 pan bolts are torqued to 12 ft-lb
• Transmission shifts normally through all gears
• Transmission fluid level is correct at fill plug hole when checked level

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle