Transmission Fluid Change

Remove and replace manual transmission fluid on the 1992 Dodge Viper RT/10 six-speed manual transmission. Includes drain, filter inspection, and refill with proper Mopar MS-9224 or 75W-90 GL-4 fluid.

Warnings

Tools required

Parts

• Transmission drain plug crush washer × 1 — Use OEM Mopar specification
• Transmission fill plug crush washer × 1 — Use OEM Mopar specification

Fluids

• Mopar MS-9224 or 75W-90 GL-4 manual transmission fluid — 4.2 qt

Preparation

1. Park vehicle on level surface and apply parking brake firmly.
2. Place wheel chocks behind rear wheels.
3. If vehicle was recently driven, allow transmission to cool for at least 30 minutes.
4. Raise front of vehicle with floor jack using designated front jacking point.
5. Support vehicle securely on jack stands positioned at reinforced frame rails behind front wheels.
6. Verify vehicle stability before working underneath.

Procedure

1. 1

   Locate transmission drain and fill plugs
   From underneath the vehicle, locate the transmission on the driver side of the driveline tunnel. The drain plug is located on the bottom of the transmission case (typically on the lower rear section). The fill plug is located on the driver side of the transmission case, approximately midway up the housing. Confirm both plugs are accessible and identify their 17mm hex drive configuration.
2. 2

   Remove fill plug first
   Using a 17mm hex socket or wrench, loosen and remove the fill plug from the side of the transmission case. This ensures you can refill the transmission after draining. If the fill plug is seized or stripped, do not proceed with draining until it can be removed. Inspect the crush washer on the fill plug and set aside for replacement.
   ⚠Always remove the fill plug before the drain plug. If the fill plug is seized and cannot be removed, you will be unable to refill the transmission after draining.
3. 3

   Position drain pan and remove drain plug
   Position the drain pan directly under the transmission drain plug with adequate capacity for at least 5 quarts of fluid. Using a 17mm hex socket or wrench, slowly loosen the drain plug. Once loosened, quickly remove it by hand while then carefully remove it by hand once the threads disengage, stepping aside as fluid begins to flow.. Allow all fluid to drain completely, which may take 10-15 minutes. Inspect the condition of the drained fluid for metal particles or contamination.
4. 4

   Clean and inspect drain plug
   Once fluid has completely drained, use a wire brush or parts cleaner to clean the drain plug threads and magnetic tip (if equipped). Inspect the drain plug threads for damage. Clean the drain plug sealing surface on the transmission case, removing old gasket material or debris. Discard the old crush washer from the drain plug.
5. 5

   Reinstall drain plug with new washer
   Install a new crush washer onto the drain plug. Thread the drain plug into the transmission case by hand to ensure proper thread engagement. Once seated, torque the drain plug to specification in a single smooth motion. Do not over-torque as this can strip the aluminum transmission case threads.
   Torque spec

   Drain Plug34 Nm (25 lb-ft)
6. 6

   Refill transmission with fresh fluid
   Using a fluid pump or funnel with hose extension inserted into the fill plug hole, add approximately 4.2 quarts of Mopar MS-9224 or 75W-90 GL-4 manual transmission fluid. Fill slowly to allow air to escape. The transmission is full when fluid begins to seep from the fill hole. Allow excess fluid to drain out until it stops dripping, indicating the proper fill level has been reached.
   ⚠Use only GL-4 rated fluid. GL-5 fluids contain additives that damage the brass synchronizers in the T56 transmission.
7. 7

   Install fill plug with new washer
   Install a new crush washer onto the fill plug. Wipe any excess fluid from the transmission case around the fill hole. Thread the fill plug into the transmission case by hand to ensure proper thread engagement. Once seated, torque the fill plug to specification.
   Torque spec

   Fill Plug34 Nm (25 lb-ft)
8. 8

   Lower vehicle and verify fluid level
   Wipe down the transmission case exterior to remove any spilled fluid. Lower the vehicle from jack stands to the ground. Start the engine and allow it to idle. With the clutch pedal depressed, shift through all gears slowly, pausing in each gear for 2-3 seconds. Return to neutral and shut off the engine. Re-raise the vehicle and verify no leaks are present at the drain or fill plug locations.

Reassembly

1. Verify drain plug and fill plug are torqued to specification and show no signs of leakage.
2. Dispose of used transmission fluid according to local environmental regulations.
3. Record the service date and mileage for maintenance tracking.

Verification

• With vehicle on level ground, start engine and verify smooth shifting through all gears with clutch fully depressed.
• Check for fluid leaks at drain and fill plug locations after 24 hours of normal driving.
• Verify proper gear engagement in all forward gears and reverse without grinding or resistance.
• Monitor transmission temperature during initial drive to ensure normal operating range.

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