The tremor’s rear end is just a ford 9.75”, so gears from 20 years ago will still work.I'm not sure what Gear Sets are available for the F150 Tremor Axles but going up to a 4.10 or a 4.30 Gear would make a huge difference. You'd have a completely different truck and gain back a lot of performance that was lost.
My F350 Tremor with the 7.3L has the Factory 4.30 Gear and 37s which is a good combo.
My Raptor Bronco has the 3.0L EcoBoost and factory 4.70 Gear and Factory 37s.
Something to consider.
I have Yukon 4.56s in my tremor and it made a huge difference.