68RFE Trans Help!

[Cummins_Legend]

Good morning, RAM addicts.

I have a problem.

My tranny is periodically shifting hard and also not shifting from 5th to 6th gear.

It just happened this morning to me.

The last code thrown was P0871 Transducer.

I replaced that with a new one and installed an ATS thermal bypass valve upgrade about two weeks ago.

It ran fine for a while, and now it is back to its old shenanigans.

I am thinking of valve body, but I don't want to spend that money if it is the entire tranny that needs to be replaced.

Any help or experience on this issue would be very appreciated.

Also, the truck is deleted, 5-inch lift, running 38s/15.50 on 22s.

Ram is a 2020 Laramie 6.7.

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