eddeere Posted February 21, 2015 Share Posted February 21, 2015 I have a B61T 673 single axel geared 5.74, 22" tires,& TRQ 7210 trans. 5D is .84 & 5HS are .69 ratios . I would like to run about 70 mph. I would like to change to a 1 piece rim which would be 24.5 rubber I think. I could stay with the 22" rubber which may be cheaper if I could find good tires. Any advise on tires and gear ratios is welcome. Also I drained the rear end and found small amount of metal flakes on the plug. Quote Link to comment https://www.bigmacktrucks.com/topic/39021-gear-ratios-tire-sizes/ Share on other sites More sharing options...
6368 Posted February 21, 2015 Share Posted February 21, 2015 Engine RPM x 60 / (Axle Ratio x Tire Revolutions per Mile x Transmission Ratio) = Top Road Speed (MPH)2100x60/ (axle ratio x476 x .69)=70126000/ (axle ratio x 328) =70126000/axle ratio= 22960axle ratio=126000/22960= 5.48Probably want something slightly numerically lower so your not running up against the governor to do that 70mph Quote Link to comment https://www.bigmacktrucks.com/topic/39021-gear-ratios-tire-sizes/#findComment-280068 Share on other sites More sharing options...
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