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Transmission issues! Help Please!

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Hey everyone, I don't know if I'm being too picky but ever since I got my DPF delete with the SCT program I've been noticing after I hit 80km an hour the truck feels very "sluggish". It almost feels like it is changing to early, as if I was in 4th gear while doing 20km an hour.

I have to push the gas pedal about 60-70% to get the damn thing to drop, and sometimes it will skip 4th and drop to 3rd.

I have the engine on the "towing" tune but I have the transmission set to stock. All the other gears feel good, very smooth transitions, no jerking or clunking, but on the highway it just doesn't feel right.

Can anyone shed some light on this issue for me please?

Thanks.

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