Quote:
Originally Posted by cRiPpLe_rOoStEr
The right gearing really does miracles mileage-wise 
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Actually, I think that I can get better FE by lowering my overall gearing a bit.
This L4N71B box has no external controls for the torque converter lock-up, it's mostly determined by vehicle speed (oil pressure from the governor on the output shaft).
Because I'm still using the standard 3.54:1 ratio diff, the torque converter lock-up is at nearly 90kph in 4th gear, fine on the motorway, no use on the highway where the limit is only 80 kph.
I have a 3.9:1 ratio diff that should drop lock-up down to about 80 kph and only increase motorway (110 kph) engine speed to about 2500 rpm.