The cost of having the actual gears swapped out and all set up again IS cost prohibitive, but to just swap a complete rear end isn't too bad. I can pull a used one from the JY for about $300 and it's a direct swap that can be done when I change out the junk shocks that are on there. Sometimes our ecomods won't have a positive ROI but it can be to see what can be done. I've tried driving in 4th (1:1) but at 55 mph I lose 2-3 mpg. At 35 mph in 4th gear the rpms are roughly the same as 5th gear and 55 mph.
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If nice guys finish last, are you willing to pay the price to finish first ?
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