My 4d55 performance build

[PowerRam348]

i'm not sure that i understand the running gear thing you were talking about. is that because of the short powerband that diesels have?

[vanderchevy18]

Diesels don't have a short power band. Actually given the rpm range, their power band is much longer than a gas motor. Its because the gearing is taller than normal, the tires are much bigger than normal, and its a relatively heavier vehicle. Its coping better with the extra power, but 75mph in 4th without the engine screaming is a bit too high geared.