My only disappointment is the shift points of the AISIN transmission, it is supposed to be bulletproof, but I tend to manually shift it because when towing it jumps into a higher gear to fast and can't get out of its own way.
You have not filled out your sig line, so I do not know the year of your truck. See if this TSB applies to your truck. Mine does much better at being in the right gear and staying there after this TSB. SnoKing
21-004-16 REV. A -2-
NOTE: This bulletin applies to DD, DF and DP vehicles built on or before November 21, 2016 (MDH 1121XX) equipped with a 6-Speed Aisin Automatic Transmission (Sales Code DF2) or an AS66RC Aisin Automatic Transmission (Sales Code DF3).
SYMPTOM/CONDITION:
A small number of customers may experience one or more of the following conditions:
Vehicles equipped with an AS69RC automatic transmission (Sales Code DF2)
• **1-2 Upshift shudder correction (Diesel engines only).
• Cruise Control shift quality improvements while on coast down.
• 3-4 Flare Issue fix (Diesel engines only).
• Trans quick learn fix (Gas engines only).**
• A harsh 1-2 upshift.
• Excessive gear shifting.
• Less than desired towing performance while using cruise control.
• Harsh engagement while shifting from neutral to drive, neutral to reverse, or park to
reverse with vehicle still in motion (rolling garage shift).
• Transmission Oil Temperature light illumination during high engine and tow loads.
• Engine flare during 2-1 tip in downshift.
• Less than desired shift quality during 6-5, 5-4 coasting downshifts.
• Delayed downshifts in Tow/Haul mode while driving down grades.
• Less than desired transmission shift performance when transitioning from low
traction surface to high traction surfaces. (i.e. ice covered road to clear pavement).
• Harsh 2-1 downshift.
• Less than desired shift points during light pedal and Wide Open Throttle (WOT)
operation or while in Tow/Haul and engine brake modes.
• Delayed engagement when shifting from neutral to drive, neutral to reverse, or park
to reverse (garage shifts).
• Audible squawk noise on 4-3 downshift.
• Poor vehicle acceleration in first gear with vehicle fully loaded.
• Malfunction Indicator Lamp (MIL) illumination with no defect found for Diagnostic
Trouble Code (DTC) P253D - PTO Sense Circuit High.
AS66RC automatic transmission (Sales Code DF3)
• **Cruise Control shift quality improvements while on coast down.
• 3-4 Flare Issue fix (Diesel engines only).
• Trans quick learn fix (Gas engines only).**
• Transmission Oil Temperature light illumination during high engine and tow loads.
• Less than desired towing performance while using cruise control.
• Harsh engagement while shifting from neutral to drive, neutral to reverse, or park to reverse with vehicle still in motion (rolling garage shift).
• Engine flare during 2-1 tip in downshift.
• Less than desired shift quality during 6-5, 5-4 coasting downshifts.
• Delayed downshifts in Tow/Haul mode while driving down grades.
• Less than desired transmission shift performance when transitioning from a low
traction to high traction surfaces. (i.e. ice covered road to clear pavement).
• Less than desired shift points during light pedal and Wide Open Throttle (WOT)
operation or while in Tow/Haul and engine brake modes.
-3- 21-004-16 REV. A
DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all related systems are functioning as designed. If DTCs or symptom conditions, other than the ones listed above are present, record the issues on the repair order and repair as necessary before proceeding further with this bulletin.
If the customer describes the symptom/condition listed above, perform the Repair Procedure.
REPAIR PROCEDURE:
NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.
NOTE: If this flash process is interrupted/aborted, the flash should be restarted.
1. Reprogram the TCM with the latest available calibration. Detailed instructions for flashing control modules using the wiTECH Diagnostic Application are available by selecting the “HELP” tab on the upper portion of the wiTECH window, then “HELP CONTENTS.” This will open the Welcome to wiTECH Help screen where help topics can be selected.
2. Once programming is complete, perform the “Quick Learn” procedure using the wiTECH diagnostic scan tool.
3. Clear all DTCs that may have been set in any module due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
NOTE: The expected completion time for the flash download portion of this procedure is approximately 3 minutes. Actual flash download times may be affected by vehicle connection and network capabilities.
Labor Operation No:
Description
Skill Category
Amount
**18-19-05-EF
Module, Transmission Control (TCM) - Reprogram
(0 - Introduction)
2- Automatic Transmission
0.3 Hrs**
21-004-16 REV. A -4-
FAILURE CODE:
The dealer must choose which failure code to use. If the customer came in with an issue and if the dealer finds a software update to correct that issue, use failure code CC, for all other use failure code RF.
• If the customer’s concern matches the SYMPTOM/CONDITION identified in the Service Bulletin, failure code CC is to be used.
• If an available flash is completed while addressing a different customer concern, failure code RF is to be used.
CC
Customer Concern
RF
Routine Flash
Attention: TDR Forum Junkies 
