Can’t say for a ‘24 but my ‘20 seems to get better mileage. If I keep my foot out of it I can get close to 20mpg on the highway, free running not towing/hauling. Trans shifts wonderfully, hardly feel the actual shift
Went from a 2011 6 speed to a 2020 10'er. Only problem I had was the TCU fried on the 2011.
The 10'er does get better mileage, when I keep my foot out of it. Some have said on other boards that the 10 isn't as beefy as the 6 but if you let it do what it does I'll bet it will handle most anything
My 2020 has 3:42 gears to go with the 10 speed Allison trans.
Not sure what the locker is but it is an auto locking rear. If you have the RPO code I can go see what mine has