Changing the transmission fluid in the 8HP90 automatic transmission of a Dodge Challenger SRT Hellcat is a crucial maintenance procedure to ensure the longevity and effective performance of the vehicle. Here is the general procedure for changing the transmission fluid and filter. Always check the owner's manual for any specific instructions or warnings related to the vehicle.
Tools and Materials Needed:
- Suitable transmission fluid (consult the owner's manual for the correct type and quantity)
- Transmission filter kit (including a new gasket)
- Wrench set
- Drain pan
- Torque wrench
- Funnel
- Gasket scraper or appropriate gasket removal tool
- Jack and jack stands or a vehicle lift
- Latex gloves
- Safety glasses
Procedure:
#### Step 1: Prepare the Vehicle
- Safely park the vehicle on a level surface. Engage the parking brake and chock the wheels.
- Start the vehicle and let the transmission reach operating temperature, as warm fluid drains faster and more completely.
#### Step 2: Access the Transmission
- Turn off the vehicle.
- Raise the vehicle using a jack and securely support it on jack stands or use a vehicle lift for better access.
#### Step 3: Drain the Transmission Fluid
- Place a drain pan under the transmission oil pan.
- Locate the drain plug on the transmission oil pan. Using a wrench, carefully remove the drain plug and allow the old fluid to drain completely. Be aware that the fluid may be hot.
#### Step 4: Remove the Transmission Oil Pan
- After draining, remove any bolts holding the transmission oil pan in place using a wrench.
- Gently pry the oil pan off with a suitable tool. Be careful as some models may have the pan sealed with adhesive.
#### Step 5: Replace the Transmission Filter
- Once the pan is removed, remove the old transmission filter. It may be snapped in place or bolted. Take note of its orientation and how it fits into the transmission.
- Install the new filter exactly how the old one was fitted. Ensure it’s securely in place.
#### Step 6: Clean the Pan and Install New Gasket
- Clean the transmission pan thoroughly, removing any old gasket material and residue.
- Apply the new gasket to the pan. Some gaskets require sealant, while others do not; refer to the gasket instructions.
#### Step 7: Reattach the Transmission Oil Pan
- Place the pan back onto the transmission and screw in all bolts by hand initially to ensure proper alignment.
- Tighten the bolts in a star pattern using a torque wrench to the specifications provided in the vehicle’s service manual.
#### Step 8: Refill Transmission Fluid
- Lower the vehicle.
- Using a funnel, pour the recommended type and amount of new transmission fluid into the transmission through the dipstick tube.
- Do not overfill. Refer to your owner’s manual for the exact capacity.
#### Step 9: Check for Leaks and Test Drive
- Start the vehicle and let it idle for a few minutes. Move the transmission through all the gears while stationary, allowing the fluid to circulate.
- Check under the vehicle for any signs of leaks.
- Take the vehicle for a short drive, then recheck the transmission fluid level (vehicle should be on a level surface and running while checking).
#### Step 10: Dispose of Old Fluid
- Properly dispose of the old transmission fluid and filter at a recycling center that accepts automotive fluids.
Following these steps will help ensure your transmission operates efficiently and can extend the lifespan of the component. Always consult the specific vehicle data for details on the correct fluid and torque specifications, and consider consulting a professional mechanic if unsure about performing the task yourself.