From 3.73, to 4.10 is a 10% change, to 4.30 is a 15% change, and to 4.56 is a 22% change. Look at the revs per mile of the new tires versus your existing tires. Note the % change. Look at your tach and note the rpm at 60mph. Decide if the gear change minus the tire change puts your RPM in the range you want for your motor.
i'm not a fast driver. on the freeway, i'm going about 65 @ 2850 rpms. that is comfortably in the torque range of my 2.8. and, i'm getting 21 mpg doing it. so, 4.56 gears, 31 inch tires, 5 speed manual, 2.8, and pulls my tent camper like it wasn't even there.
yeah, i'm a happy camper for sure!!
im running the same engine, transmission and tire size.
im running m/t tires so i guess they are even heavier.
i went from 3.73s with 30"s to 4.10s with 30"s and then to 31"s
if u want it to drive almost as stock again ill say 4.10s
its a good ratio overall.
it has good acceleration and still wont rev to high while cruising at 40-60mph speeds.
4.56 would give u killer acceleration, but will hurt the speed imo. its around 500-600rpms higher now. with 4.56 it would easily be around 1k rpms
as it is my truck reaches 90 mph at the speedo. thats almost 100 mph according to the speedo and tires calculator. its at 4.5k rpms while going that fast.
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