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not sure which TSB the part number is associated with, i just know that it is the latest release part number for 2020 H.O. with the Y78 recall installed, the previous being: P6401032PA
for a 2019 H.O. latest part number for the Y78: P6401932PB with P6401932PA being the initial one released
Definitely not ideal to run the cp4 cal with the cp3 pump (if done through ram and not the S&S kit), it will work but is definitely not ideal. There are a few things changed related to flow limits and ima current vs flow, along with some pressure for cranking and such. commanded operating...
More because they hadn't gotten a read of the new binaries, and didn't have them mapped out yet. Since there was already an initial Y78 part number, no one was really expecting a new one shortly following the initial release. Coupled with the 22' bootloader, the initial fear was the new part...
That is the exact reason many tuners are not working as desired. There was more than one update for the Y78 recall, but nothing was locked down, just a new software part number
there is no locked ECM with the latest updates from Ram. It is only a part number update, if you have tunes you will want to just make sure wherever you got them from sends them over using the new part number.
The latest updates being done to the ECM DO NOT lock down the controller, it is only an updated part-number. This does not update the controller to the new bootloader that is present in the 2022's.
I am currently running the full deaver setup that carli spec'd bought from cjc. Ride is quite a bit better than stock, smoother, and soaks up large bumps.
They say roughly 15% drop in payload, have had maybe 700lbs in the bed and didnt seem to drop much more than when stock.
Installing the...
Option A is similar to what i went with so i vote that, except i have a 3500 and went with the Thuren track bar, and backcountry shocks (more of a want than a need at this point.)
Also am running the Zone radius arms as i didnt want to use drop brackets.
I didnt want to drill holes in the frame either, so i pieced my kit together with Radius arms that are designed for the increased height.
2020 3500 SRW
Carli Backcountry 3.25"
Thuren active rate sway bar
Thuren Track bar
Full progressive leafs
Zone Radius arms
Fox ATS stabilizer
works for me...