68RFE Transmission Hard Shift?

[Rbeasley3]

We purchased a used vehicle with DRD tunes already on it.

I don’t know much about it, honestly.

I do not know if I have a transmission tune or not.

Recently, it has started shifting hard if I let off the accelerator, let it coast, and press the gas again around 30-35 mph - the had shift occurs.

Also, when downshifting with the exhaust brake on, it seems really hard.

Built transmission before we got it.

2017 RAM 2500 6.7L Cummins.

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[Corkey]

Line pressure would be something to look at.

It probably has 240 to 260psi.

The shifting would be associated with what you're describing.

Increased pressure = less slip, which means less heat, which the 68RFE hate.

On the monitor, it should show on the left side "TCM" and a number beside it.

That is a general assumption you have a Trans tune engaged.

The right side will be the RTR or the sound tunes you have chosen.

If you're skeptical about a going wrong, get a decent scanner to show any codes that the MM3 may not pop up.

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