Good morning,
When the pan was dropped, was there any metal or debris in the pan or on the magnet?
https://www.2carpros.com/articles/automatic-transmission-problems
Are there any codes set in the system?
Does the truck have reverse?
The most common failure is the torque converter or the front pump inside the transmission.
Pressure tests need to be done to confirm there is no line pressure for the transmission to work. I attached the procedure and the chart for testing. You will need an advanced scan tool for this test plus a pressure gauge to attach to the transmission.
Roy
Line Pressure Check Procedure
Tools Required
J 21867 Pressure Gage
Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.
Important: Before performing the line pressure check, verify that the transmission Pressure Control (PC) solenoid is operating correctly.
1. Install a scan tool.
2. Start the engine.
3. Inspect the transmission for the proper fluid levels.
4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.
5. Inspect the manual linkage at the transmission for proper function.
6. Turn the engine OFF.
7. Remove the pressure plug.
8. Install the J21867.
9. Access the Scan Tool Output Control for the PC Solenoid.
10. Start the engine.
Important: In order to achieve accurate line pressure readings, the following procedure must be performed at least three times in order to gather uniform pressure readings. The scan tool is only able to control the PC solenoid in PARK and NEUTRAL with engine speeds below 1500 RPM. This protects the clutches from extreme high or low line pressures.
11. Begin commanding PC Solenoid at 1.0 amp and lower the amperage in one-tenth increments (0.01) until maximum line pressure is achieved.
12. Allow the pressure to stabilize between increments.
13. Compare your pressure readings to the Line Pressure table.
14. If the pressure readings vary greatly from the line pressure table, refer to Oil Pressure High or Low.
15. Turn the engine OFF.
16. Remove the J21867.
Notice: Refer to Fastener Notice in Cautions and Notices.
17. Install the pressure plug.
Tighten the pressure plug to 8 - 14 Nm (6 - 10 ft. lbs.).
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Sunday, July 19th, 2020 AT 4:12 AM
