Rob Posted August 10, 2007 Share Posted August 10, 2007 I know we have spoken of this before but I can't remember what ratio I need to run 75mph with 11RX22.5 rubber and a RTO-12513 transmission. I'm also wanting to be between 1800 to 1950 rpm for good flat land speed. The tractor currently has 4.17 rears that I'll probably keep for one of my B models.Thanks again,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
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