Motive Gear TFD30-488JKF - Rear Ring and Pinion Gear Set Motive makes kits in the 4.56 and 4.88:1 ratios... The problem is, You can't change the gears in the rear differential without changing the gears in the transmission (aka: transaxle) also. Because, you can't have two different gear ratio's running at the same time without braking drive line parts. (exception would be for racing purposes, usually in the mud or snow). Motive Gear is a really good gear set. I have been using them for years. I haven't seen anything in reference to re-gearing the 9 speed automatic transmission/transaxle.
2019 Trailhawks are lower than that. Not sure exactly what the final drive ratio is, but the crawl ratio went from 20:1 to 21:1.
I think, But I'm not sure, that 1st gear in the tranny is what they changed on the 2019 Trailhawk, The only time it even uses 1st is in 4low..