I recommend taking your vehicle to an FCA dealership for a formal diagnosis. As POWERMAN mentioned, there is a TSB that may be related to your transmission shifting concern; the dealership can take a look at your delay concern as well.
TSB 21-012-14 REV. B
8 Speed Transmission Shift Adaptation, Drive Learn Procedure
This bulletin involves performing a Transmission Adaptation Learn procedure based on a subjective shift quality rating evaluation.
NOTE: The adaptation drive learn procedure must be performed on all 8-speed transmissions when the transmission is repaired/replaced and/or the Valve Body/TCU assembly (mechatronic) is replaced, or when the adaptation
memory cells are cleared with the wiTECH diagnostic scan tool.
2013 - **2015** (DS) Ram 1500 Pickup
2012 -**2015** (LD) Charger
2012 -**2015** (LX) 300C
2014 - **2015** (WD) Durango
2014 - **2015** (WK) Grand Cherokee
**2015** **(LA)** **Challenger**
NOTE: **This bulletin applies to vehicles equipped with the 845RE (Sales Code DFL), 8HP45 (Sales Code DFG), 8HP70 (Sales Code DFK), or 8HP90 (Sales Code DFE) 8-Speed Automatic Transmissions.**
The 845RE, 8HP45, 8HP70, or 8HP90 8-Speed Automatic Transmission uses a
sophisticated shift algorithm that includes learned information so that the shift quality remains excellent even as the transmission wears. This learned information is recorded in memory cells referred to “Adaptation Memory Cells”. Each applied clutch records the amount of time it takes to fill the clutch (Fast Filling Counter/Filling Time) and the amount of pressure (Filling Counter/Filling Pressure). The adaptation memory cells are set to zero (0) on every new transmission (new in vehicle and/or replaced for service) and when the transmission control module is replaced for service. In addition, the adaptation memory cells are set to zero (0) when the transmission control module adaptation memory cells are cleared using the wiTECH diagnostic scan tool. Until the adaptation has been learned/relearned, the transmission shift quality may not meet the customers expectations.
NOTE: Anytime the transmission has been overhauled (unless the Valve Body/TCU assembly (mechatronic) was replaced), the adaptation memory cells must be cleared using the wiTECH diagnostic scan tool.
The adaptation memory cells appear on the wiTECH for every clutch. Each clutch will include:
• Fast Filling Counter = the number of filling time events that has taken place.
• Filling Time = +/- number of ms (milli seconds) from zero (standard set value).
• Filling Counter = the number of filling pressure events that has taken place.
• Filling Pressure = +/- mb (millibar)/PSI (Pounds Per Square Inch) from zero (standard set value).
If the adaptation memory cell “counter” is zero (0), than the adaptation memory cell has not been updated. The filling counter ideally should be at least 12 (6 on 8HP70/90) and Fast Filling counter at least 4 (2 on 8HP70/90) to improve shift quality and with each subsequent count, shift quality will improve even more.
Customers may indicate that their transmission shift quality does not meet their expectations.