Need help with a strange issue regarding my 68RFE

[Rob.simmons6.7]

So my 2011 6.7 Cummins has a very slow gear change from 5th to 4th gear (downshift).

If I am in 5th gear and step on it enough to downshift to 4th it takes so long that the engine rpm with rev up a bunch and it will SLAM into 4th. It slams hard enough to spin the tires on a dirt road going 35ish. It also does it when lugging down going up a hill. I have to let off and let it shift down to 4th then get back on the throttle.

Another thing that it does is when shifting into drive from any gear takes longer then it should. Shifting into reverse is almost instant. I wondering if my problem is valve body related. The trans doesn't slip at all and up shifts perfect except for the pointless shift flare bs.

Any help / suggestions is extremely appreciated!

Truck is Stock except ARP 625+ head studs, AFE Stage 2 intake, Fully Deleted, H&S Street tune and Overdrive trans tune. Transmission behaves the exact same stock tune or on the H&S tune.

84k miles.

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[watersupply189]

So my 2011 6.7 Cummins has a very slow gear change from 5th to 4th gear (downshift).

If I am in 5th gear and step on it enough to downshift to 4th it takes so long that the engine rpm with rev up a bunch and it will SLAM into 4th. It slams hard enough to spin the tires on a dirt road going 35ish. It also does it when lugging down going up a hill. I have to let off and let it shift down to 4th then get back on the throttle.

Another thing that it does is when shifting into drive from any gear takes longer then it should. Shifting into reverse is almost instant. I wondering if my problem is valve body related. The trans doesn't slip at all and up shifts perfect except for the pointless shift flare bs.

Any help / suggestions is extremely appreciated!

Truck is Stock except ARP 625+ head studs, AFE Stage 2 intake, Fully Deleted, H&S Street tune and Overdrive trans tune. Transmission behaves the exact same stock tune or on the H&S tune.

84k miles.

Welcome friend!!


2016 Ram Laramie 3500, G56, 6.7, MM3 by Double R Diesel, Rough Country Leveling, 35x12.50 Nitto G2, HID headlights, Morimoto LED fogs plus a whole lot more!

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[Rob.simmons6.7]

Thanks. Glad I came across this forum, seems to have loads of info! Now hopefully someone can chime in on what could possibly be wrong. I emailed revmax and they have never seen what I have going on.

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[watersupply189]

Thanks. Glad I came across this forum, seems to have loads of info! Now hopefully someone can chime in on what could possibly be wrong. I emailed revmax and they have never seen what I have going on.

This is the best forum out there for sure. Sorry I don’t know the answer to what your looking for but hopefully someone can chime in.


2016 Ram Laramie 3500, G56, 6.7, MM3 by Double R Diesel, Rough Country Leveling, 35x12.50 Nitto G2, HID headlights, Morimoto LED fogs plus a whole lot more!

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[MC250r719]

Did you do a trans relearn when you loaded the trans tunes?

You could try that. Reload the trans tune and make sure you drive for a minimum of 30 miles of no more than 30% throttle stop and go driving.

Going from 1st to 6th as many times as possible in that 30 mile period. No highway driving.

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