Sorry forgot to clarify 23+, 20-22 Superduty Tremors are simple everything gets the M275 in the rear with a super 60 up front.Most if not all 22- 7.3 Trenors got the Dana M275. I know mine does.
With 23+ it appears not all Tremors use the same rear axle for every configuration or even the same M275 anymore like the prior generation Tremors. Every 23+ Tremor Dana axle I have seen resembles more like a M300 center section with smaller tubes than the DRW variant. The new Sterling offering in the 23+ that seems to be more prevalent in the 7.3L Tremors but haven’t been able to definitely pin down what stipulates which axle is used now.