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Classic Truck Discussion Board

Topic: Re: B-61 MACK HELP
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steve21757

08-23-2009 06:42:45
68.92.125.19
32586



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russ were you figuring the mph at max rpm of engine which is 2100 or less?I havefound a 3.90 rearend, how much faster would that be?THANK YOU SO VERY MUCH FOR YOUR HELP.

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russ springerr

08-25-2009 05:33:07
67.151.214.3
32600



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390 will give you another 6-8 miles per hour.if you are just going to pull tractors with it you are better off with a 390
russ

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