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Originally Posted by bludragon13

thanks for the input steve, the unit is a freightliner columbia,straight truck ,120in sleeper,18ft box,10spd ultra shift,geared ay 3:58,about 7300 payload when loaded with our gear fuel etc. will add tag axel at a later date. we are just looking now and this is less payload then we have now however we rarely use the higher payload. about 90 % of loads are less then 6000. thanks again for any thoughts on this setup.

Depends on what size tires are on it and what hp/torque curve it is.

Yep, the ACERT's are that picky. Two 430 hp engines could be geared different based on the torque/hp package it has.

Last c-13's I did were 3.58's on low pro 22.5's and a flat 430hp/1650 torque (no multi torque or cruise power). Trucks had .74 final 10 speeds pulling 95,000 gross. I should have put 3.42's in them. They did OK, better than I thought but 3.42's would've done better.