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Transmission Filter Replacement

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• READ THE JEEP SERVICE MANUAL FIRST!

• You will need a FLAT surface to complete this repair for your safety.

• READ ALL OF  THIS PROCEDURE SEVERAL TIMES SO THAT YOU UNDERSTAND IT.  DO NOT PERFORM THE PROCEDURE OUT OF ORDER.  THIS WILL RESULT IN DEATH OR SERIOUS INJURY.

• Read our Safety page too.

• Read and follow the instructions from the side of the box of the kit.

We have available for download the complete procedure on our DOWNLOADS page

TOOLS NEEDED:

1. 7/16 Socket

2. 3/8 ratchet

3. 3/8 extentions

4. Oil drain pan (At least 4 gallon capacity)

5. Torque Wrench

1. Be aware that the Felpro kit part number TOS18621 is ONLY the gasket and NO filter.  We found this out the hard way!

2. Place oil drain pan under the rear portion of the transmission pan.

3. The GM TH400 has a very distinct pan, some call it an inverted Texas pan due to its shape. The GM HydraMatic TH400 Transmission - Novak Conversions The pan contains 13 bolts.

4. Slowly and carefully loosen the pan bolts in a crisscross pattern.

5. Place a jack directly under the pan.  Leave a slight gap between the pan and the jack to prevent puncturing the pan.

6. Remove the bolts from the rear of the pan then slowly work back to the front of the transmission.

7. Allow the old fluid to drain out into the drain pan, slowly.  Otherwise, the old fluid will spill allover the ground.

8. After all bolts are removed, drain remaining fluid out of the pan.

9. Remove the old gasket from pan.

10. Remove the old filter by gently pulling on the center old filter.

11. Clean out as much old fluid as possible.

12. Clean out the pan of fluid and sludge.

13. We removed the modulator at the same time since the fluid was out.  The modulator only has one bolt on the holding collar and the vacuum line.  When replacing a modulator, also replace the vacuum line hose.

14. Most replacement gaskets require no RTV or adhesive.

15. Install the new filter.

16. Place the new gasket on the pan and position the pan for reinstallation

17. Insert bolts at each of the "corners" but do not tighten.

18. Then insert the remaining bolts.

19. Tighten the bolts to no more than 13 foot-pounds USING a torque wrench.

20. After tightening all pan bolts to proper torque, then fill with transmission fluid through the dipstick tube.

21. Initially fill using 3 quarts, then check the fluid level.

22. Start the engine and warm up the transmission to 190 degrees F.

23. Continue filling to full mark while hot.

24. Check for leaks and drips from transmission.

25. After filling completely, place brake on and engage gearshift to R reverse, allow it to engage then move to D Drive.

26. For about the first 5 minutes drive the vehicle slowly (no more than 20 mph).

27. Recheck fluid level, add if necessary.

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