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Our 05 F-350 V-10 Ford had the 4:30 diff. It was a brute. The thing was pulling @ 22K GCWR or more and it pulled every grade we put it on. It pulled some RPM's but those big block gassers were designed to do that. It sure screamed on some of those long hard grades and a couple of times we ran out of motor.
Stay within what they were designed to do and they can't be beat.
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