Quote:
Originally Posted by Diseasel300
SDL also has a 2.88:1 rear end. Your "before" mileage isn't too far off from what mine is presently. I average 24-25mpg in town, and 29-30mpg on the highway. For being an oceanliner, I'm pretty happy with that. I have wondered about swapping in a 420 rear end to get the highway RPM's down, the interstate speed limit is 80mph in this area, and 3300 RPM can get a little droning.
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I wouldn't put a taller diff just because it'll be painfully slow off the line but that's just me. I actually considered a shorter 3.07 diff off a 300E to improve acceleration at the cost of fuel economy. I don't know, I might still do that. I'm in the midst of rebuilding a #17 head to replace my cracked #14 so one project at a time.