Basically the gear ratios are same as Cossie t5 1 to 4 5th is slightly taller and 6 gear is very low as with most t56 boxs so at 80 mph you'd probably be only reving at 2000 rpm in 6th gear depending on your final drive,very very strong box and shifts nice and positive same as t5,there a lot of v8s supra,s and vipers etc using them with 1000 hp,plus the t56 is stronger and shifts better at higher rpm