alex g Posted September 30, 2012 Share Posted September 30, 2012 Hi guy's I was wondering if anyone can tell me what my top speed would be for my truck.The guy I bought it from told me it was a 100mph truck.It is a 350 mack with a eaton 13 double over and 4.17 mack rearends and it has 24.5 rubber.I think from what I can find on the internet the final trans drive is .62.I haven't been able to try it out because when I bought the truck the cam was on it;s way out and needed to be replaced.I only drove it off the float and in to the shop. Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/ Share on other sites More sharing options...
MACKS Posted September 30, 2012 Share Posted September 30, 2012 There was a speed calculator posted on here somewhere,I don't know how to find it but maybe someone can re-post it for you! Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139636 Share on other sites More sharing options...
fifth wheel Posted September 30, 2012 Share Posted September 30, 2012 quick figuring @1800------93mph @2100-----109 mphFW Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139637 Share on other sites More sharing options...
theakerstwo Posted September 30, 2012 Share Posted September 30, 2012 http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139638 Share on other sites More sharing options...
alex g Posted September 30, 2012 Author Share Posted September 30, 2012 thanks guys. Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139671 Share on other sites More sharing options...
MHfred Posted September 30, 2012 Share Posted September 30, 2012 Here is the one Glenn pictured: http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swfEDIT: A link shows until you hit post and then it disappears. Apparently that is what happened to Glenn also.http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139731 Share on other sites More sharing options...
rick harper Posted September 30, 2012 Share Posted September 30, 2012 7.93 x 4.17 x .78= 25.79 2100 / 25.79= 81.426 mphIll bet your 1st od is .87 and final od is .78. Quote Link to comment https://www.bigmacktrucks.com/topic/27564-calculating-speed/#findComment-139766 Share on other sites More sharing options...
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