I’ve got a 2015 Cummins running the 68RFE.

It’s deleted and tuned by Milliken Diesel Performance running the Smarty MM3.

My transmission cooler lines bulged and caused separation at the transmission couplers.

This happened at cruising speed, not harsh condition.

The dealer claims it’s due to increased line pressure from the tune.

But I’ve heard conflicting accounts from different diesel shops.

Does anybody have an actual experience with this?