My RAM 6.7 Diesel Shuttering / Lugging HELP

[bradley.duckett]

Hey Cummins owners / fans

I have a 2015 dodge ram 3500 6.7L fully deleted with MM3 Tuner and CCS tunes with trans tunning 38 inch nitto tires plus 22 inch fuel wheels, S&B CAI and a 8 inch bds long arm lift kit with dual stabilizers and a 4 inch MBRP exhaust catback.

I'm pretty new to the diesel family so I'd figure I ask all of you instead of spending thousands of dollars at a dealer to diagnose my problem and I'm sure that's why were all here is to help each other out and save some money so give me a break if you can help me out.

My problem :the issue that the truck is having when I'm pulling my 8000 pound travel trailer up some steep grades it starts to kind of chug and shutter and I lose power at the floor, so I drop the gear down 5/6th to about 4 th gear to get my RPM above 1500 and then its fine and the EGT's start to actually go down.

I just want to know if this is a common issue with diesel's and I just have manually gear down all the time and also (towhaul mode is on ) or is my problem too big of a tire or is it a trans tuning problem idk where to start or if I should go see my diesel mechanic in town?

 0 Comment(s)

[RamIt]

Hey Cummins owners / fans

I have a 2015 dodge ram 3500 6.7L fully deleted with MM3 Tuner and CCS tunes with trans tunning 38 inch nitto tires plus 22 inch fuel wheels, S&B CAI and a 8 inch bds long arm lift kit with dual stabilizers and a 4 inch MBRP exhaust catback.

I'm pretty new to the diesel family so I'd figure I ask all of you instead of spending thousands of dollars at a dealer to diagnose my problem and I'm sure that's why were all here is to help each other out and save some money so give me a break if you can help me out.

My problem :the issue that the truck is having when I'm pulling my 8000 pound travel trailer up some steep grades it starts to kind of chug and shutter and I lose power at the floor, so I drop the gear down 5/6th to about 4 th gear to get my RPM above 1500 and then its fine and the EGT's start to actually go down.

I just want to know if this is a common issue with diesel's and I just have manually gear down all the time and also (towhaul mode is on ) or is my problem too big of a tire or is it a trans tuning problem idk where to start or if I should go see my diesel mechanic in town?

RPM under 1500 is a dead give away. The solution, don't climb grades in overdrive gears while pulling weight. Stick to 4th during the climb.

Also the tires might be an issue too. Are you regeared for those 38s or running the 3.42s? If you aren't geared, you definitely want to do that for that size tire.

I assume your truck has an AISIN as wel?

 0 Comment(s)

[RamIt]

Also nice truck. Looks badass

 0 Comment(s)

[bradley.duckett]

thanks for the quick response, yeah pretty sure I'm running 3.42 gears and only 68RFE trans. and also shouldn't it automatically shift too a lower gear when climbing and not me doing it automatically ?

 0 Comment(s)

[RamIt]

thanks for the quick response, yeah pretty sure I'm running 3.42 gears and only 68RFE trans. and also shouldn't it automatically shift too a lower gear when climbing and not me doing it automatically ?

Gotcha, well with a 68, you DEFINITELY need to regear it. And normally it would, but it sounds like your shift strategy isn't optimized for your tire size & lack of taller gears. Might want to look into having a dedicated tow tune made with a shift strategy built around pulling that kind of weight. But start with the gearing first and see where that gets you. Probably need to be looking at 4.10s or better with 38s

 0 Comment(s)

[CMB]

Second the 4.10 suggestion 2 thumbs up

 0 Comment(s)