With the comment about the LT230 and ZF 4 speed thats what I have with a lower ration low range and custom torque converter. I'm getting 11.4l/100km. My daily commut is 150km. I have been offered a 5 speed ZF but need to know about the hassles of fitting and also the ECU issues.

Bassed on the 7l/100km it would take my just under 2 years to save the $4000.