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I don't have the 545RFE. I have the older (and less fuel efficient) 46RE. Next time I drop the pan, I'm debating between a shift kit, and simply cranking the line pressure screw a few turns. Fortunately, I don't mind the firm shifts.
FWIW, mine has 3.73 axle gears, the tranny ratios are: 2.45, 1.45, 1, 0.69. Tires are 225/70/16 (will be replaced with 245/70/16 when these wear out to use all available tire clearance)
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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