It's likely not the cure, but no way it can hurt, long as you manage the TG pressure resistor - the harsh 2-3 shift results because TCM holds 2nd range until after 3rd range is engaged - increased line pressure makes it very obvious - does it in normal mode also but normal line pressure makes it less noticeable - my KJ actually slows down on light throttle application with the resistor switched-in - keep us informed, and I'm sure Suncoast will be interested, also - btw, did you do a thread when your trans cratered as to effect and cause?

Using a tranny shop that knows how to build a performance tranny is a key requirement for success. I know one CRD owner personally who has the same kit installed, i.e., HD clutches, SunCoast TC, the works and is thrilled with it. His exact words were "it's awesome." He said shift quality is tremendous, far better than anything he has experienced in an automatic. He owned a Dodge Ram Cummins diesel before the KJ CRD and is familiar with diesel powered vehicles.

He has the same TCM in his 05 CRD that this unfortunate CRD owner has. Same model CRD. Same parts as far as I can tell. One big difference is that he had Ron at SunCoast build his 545RFE for him. It takes far more than just parts and knowing how to install them to make a HD performance upgrade work.

When Retmil46 and I were asking Bruce about using those HD kits in our tranny's, he warned us about using them without a custom build and mods to the valve body to make it shift correctly. His warning was that they can engage so agressively that they will lock up the tranny in two gears at once, due to the shift overlap. It takes expertise that many shops do not have to build a performance tranny.

Each clutch maintains a learned volume in the TCM. Sounds to me like the transmission was changed but the TCM still thinks it's controlling the old trans.

You need to reset the TCM learned clutch volumes. If you're friendly with the dealership, ask them to do a "Quicklearn" on your trans. Should take about a minute on a warmed up transmission with the proper diagnostic equipment.

If you want to try it yourself, possibly an aftermarket code reader could do it, I don't know. It a similar diagnostic call to a fault code read. Try searching through all other functions, look for something called quick learn or similar. Maybe someone else can chime in on that one.

okay had to take it to the dealer cause no one had a drbII to preform the quicklearn... turns out i had a bad line pressure solenoid..

dealers comments were... fixed problem, shifts hard and slips take to transmission shop...

upshifting all is good... nice and crisp shifting you can tell when it goes into gear but it is not harsh at all...
downshifting... slips when you get on it, sometimes it just slips and then catches sometimes it chatters, mainly dependent on how much throttle you are giving it.

once i get this slipping on the downshift figured out i recommend this 100% if you need a rebuild

Trevor

Earlier today I was reading in the 05 fsm about limp modes, there are 3. But while there I read about the quick learn thing and as I understand it it's not the pot of gold at the end of the rain bow just a step further along the path and normal driving is still needed as I read it. It also told how to do it for certain gear changes with out a scan tool. You might want to give it a look. Here's one section.
Procedure To Learn A Smooth 1-2 Upshift And
3-2 Kickdown:
Use the following steps to have the TCM learn the
2C shift volume.
NOTE: The transmission oil temperature
must be above 110°F (43°C).
1. With a vehicle speed below 48 km/h (30 MPH)
and the transmission in 3rd gear, perform multiple
3-2 kickdowns.
2. Repeat step 1 until the 3-2 kickdowns become
smooth and the 2C CVI becomes stable.

Joe