LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2024 >> Gladiator Nighthawk, Part Time T/Case Control, Automatic Trans >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> 8HP50/850RE Automatic Transmission (Service Information) (1 Of 2) >> Standard Procedure >> Check Fluid Level >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Check Fluid Level: Notes

WARNING:

There is a risk of accident from vehicle moving when the engine is running. Secure vehicle to prevent it from moving. There is a risk of injury from contusions and burns if you insert your hands into the engine when it is running. Do not touch hot or rotating parts. Wear properly fitted work clothes.

CAUTION:

A unique transmission fluid has been developed for this transmission. This fluid is NOT compatible with ATF+4 or any other current FCA US LLC transmission fluid. For specifics about this unique fluid see CAPACITIES AND RECOMMENDED FLUIDS .

NOTE:

Oil dye is not required to find leaks in the 8HP transmission. The oil dye can cause shift quality issues and is not recommended. The 8HP fluid has illuminance that is visible under a black light. 

  1. Open the hood.
    NOTE:

    The hood must be open for the engine to run while performing this procedure.

  2. Raise and support the vehicle on a level hoist  . Refer to HOISTING, STANDARD PROCEDURE .
  3. Disable the Electronic Stability Control (ESC).
  4. Start the engine. The engine must continue to run for the entire test.
  5. Using a diagnostic scan tool, verify that the transmission oil temperature is between 30°C (86°F) and 50°C (122°F).
  6. Make sure the tires at least 8 inches off the ground.
  7. Using the scan tool, raise the engine speed to 1500 RPM for 30 seconds.
  8. Return engine to curb idle speed.
  9. With the brakes applied, place the transmission in REVERSE and hold for 10 seconds.
  10. Place the transmission in DRIVE and hold for 10 seconds.
  11. Release the brakes, slowly accelerate to 2nd gear and hold for 10 seconds.
  12. Apply the brakes and place the transmission in PARK.
    NOTE:

    A full transmission will have oil at the bottom of the transmission fill hole with the transmission between 30°C (86°F) and 50°C (122°F). Do not over fill.

    NOTE:

    If the transmission oil temperature EXCEEDS  50°C (122°F) before the fluid level check is complete, it will be necessary to shut vehicle off and restart this procedure when the transmission oil temperature is allowed to cool to 30°C (86°F).

  13. Remove the transmission fill plug from the right rear of the transmission case and allow excess oil to drain from the transmission fill hole or add the proper transmission oil until it is level with bottom of fill hole as necessary. Refer to CHECK FLUID LEVEL  .
    GC0200790Courtesy of CHRYSLER GROUP, LLC
    1 - Fill Plug
  14. Install the transmission fill plug.
  15. Remove the support and lower the vehicle.
  16. Using a diagnostic scan tool, clear any Diagnostic Trouble Codes (DTC).
scientia non olet · About LEMON Manuals