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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