with 225 hp, what torque were you getting?

Unless the torque is a lot higher, perhaps the 135 is all you can expect with such a boxy truck...? If you have like 400# torque then maybe a taller gear will get you to 145 or so?

(What the hell do I know?)

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.