I have a 2010 Dodge 2500 RAM Megacab 6.7L Cummins.
68RFE (just rebuilt 2k ago, HD torque converter, HD valve body, billet input, etc.)
FASS 165
Pusher intake horn
Pusher grid heater
Sinister cold air intake
BD deep transmission oil pan
RaceME Ultra settings = (150hp, 1900 rail, 29* timing, quick spool, aftermarket transmission) usually drive in Tune 4 (Performance) unless towing, but I don't tow a ton.
The truck had weight loss and tuned with RaceME Ultra in April 2021.
It ran great for 6 months or so and then developed this issue. (Also, around the time I installed the Pusher intake, grid heater, and BD deep pan)
Over the past 6 months, my truck has developed a shutter in 6th gear between 50-60mph under light acceleration, mainly up hills and sometimes when entering the freeway. Also only does it in higher tunes (3-5 RaceME Ultra).
So far, I've;
1) Had the rear driveline redone with a new carrier bearing, U-joins. Brand new front driveline.
2) Fuel rail sensor
3) Fuel pump regulator
4) Fuel rail relief valve
5) Fass 165 installed and fleece fuel filter removal.
1-5 we're done about 8k miles ago
6) Transmission fully rebuilt with HD torque converter/valve body/billet input shaft
6 done 2k miles ago
Also, when monitoring Trans pressure actual and Trans pressure desired, trans desired shoots up to 225 while actual usually peaks around 170-180ish.
At the same time, I notice the Torq Conv slip goes from around 0 RPMs to -50 RPMs
Do you have any suggestions?
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