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Thread: Differential change from 4.1 to 4.30/4.56

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11-02-2017, 04:08 PM	#12
Laco Senior Member Brand: Thor Motor Coach Model: Gemini 24TX (Formerly) State: California Posts: 1,459 THOR #5821	You will gain some pulling power at lower speeds, will lose speed at the high end, and will be turning more RPM's all the time, so expect fuel mileage to take a hit. If you have a governor on board, it likely measures engine RPM's, so in that case you will definitely lose hi end speed. __________________

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