The last time someone mentioned flushing the transmission another person showed us a Chrysler bulletin showing they were against "flushing" transmission and power steering

Check the fluid level and then maybe read the FSM on how to force the TCM to relearn individual shifts

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

I have had my 06 F37'd since I drove it off the lot 3 yrs ago. Never towed, no ECM tune, now @45K. Noticed trans has occasional subtle slip or thunk/hard shift a couple times (3) in past month. No issues prior, should I flush and change filters prior to trip to SD and see if it improves, or do I have a bigger issue w/ TC? Thanks. Oh, no codes BTW.

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06 Jeep KJ CRD Sport full Mopar skids, front tow hooks, rear hitch shackle, Magnaflow muffler, Samco Sport CAC hoses, 02 Airbox mod, Unique series 42 steel wheels.

Joe, What is an FSM??

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20 year owner of Libby CRD!
2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

I'm no expert but I believe that FSM is the Factory Service Manual, there is a link around here somewhere to be able to download it for free.

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2003 CRD KJ Cherokee Sport
2" OME lift kit
245/70 R16 LT Bridgestone D694's
ARB Winch Bar with 12,000lb Winch fitted with ROPE
Full set of Mopar Skids (Modified to fit my year model)
Mopar OEM Fog Lights fitted to a SPORTS model
JEEP Spot Lights fitted
Rola Vortex Roof Basket

Exactly

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Great tips Joe, my Eco Jeep has not engaged properly on a cold park to R or D since I did a fluid and filter change. I have the 06 Liberty FSM CD, I just printed the "Drive learn instructions, will do the procedure when the wife gets back with the warmed up tranny.

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20 year owner of Libby CRD!
2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

When I first switched to 215-85-R16 tires the trans shifting was a little off. After taking it on work related trips where I piled up over 1500 miles in a couple weeks, the trans now shifts properly. FSM may have a way to train it faster than driving for two weeks and going over 1500 miles. Been too busy to even look it up.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

It does

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)