Quote:
Originally Posted by Andy4639
If I could get 18MPG I'd be happy. I'm not wanting 22-25MPG just better than 14!
As far as the posi units I don't know. I'm going to be looking over the holidays and seeing what I can find.
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As stated early the Eaton Detroit Locker True Trac is an excellent choice for posi options. We run them in about everything except Jeeps where ARB airlockers work better. Currently putting the True Tracs in two supercharged LS vehicles.
The final gear (overdrive) difference between the 4L60E (.70) and 4L80E (.75) is only .05. This equates to less than 200 RPM reduction at 80 mph with your 4:10 gear ratio. I think you're on the right track by changing your gears to 3:42.