I think you're going the wrong way by dropping revs at hwy speeds, totally agree with fxst78.
You might be better off changing diff ratios to suit the larger tyres we run,
Doing it the other way your peak power will be at 130kph, impractable IMO
I think those reduced 5th gears are better suited to Duramax or 6.5td conversions.
maybe even LS1, Going to be peed off if you fit them and not all cracked up as could be.
Leave the ZD30 alone its fine as it is, no big power machine, As I always say its only 3ltrs
and highly tuned as is, best spend some money on keeping it efficient.
Its never going to win any best motor awards, just NADS it and leave it, gearbox and auto included
unless you want reduction gears
Reply With Quote