6.2/10 Speed Range DFM Disabler Info......

[Tjeli]

Range still lists this as not compatible with the 6.2L/10 speed.  I ordered one and did my own testing.  I waited until I could repeat some results before I shared my findings.

 

I have a '20 AT4 6.2L.  The Range unit DOES work on my truck.  I did have the slight RPM surge under part throttle in a high gear that others have reported.  I believe this is the reason they are saying they are not compatible yet.  Here is my theory and what I have found..... This surging only occurs between 8th and 9th or 9th and 10th gear.  It appears the computer is trying to decide which gear to be in under the current operating conditions.  If I put approximately 100 miles on the truck with the unit plugged in the surging totally disappears.  If I unplug it for a while and then plug it back in, the surging comes back.  I believe this is nothing more than the TCM having to "learn" what to do with DFM disabled.  I greatly prefer the way the truck drives and sounds with DFM and auto start/stop disabled.  

 

I would be interested to hear from those of you that have had the surging issue.  Drive it for 100 miles and let the TCM learn.  Let me know your results.

 

-Eli

[Monkey]

I have the same config but I couldn't get the RPM bouncing to stop. Had it in far longer than 100 miles and like you can repro in the higher gears around 50 or so MPH

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[Tjeli]

Mine may have come back after not driving the truck for 3 days.

[Nick Esposito]

I am getting the 2021 LT Trail Boss pretty soon with the 6.2l and the 10 speed. I already have the Diablo sport S1000 but idk if it is compatible with the 10 speed or not