hello guys im new to the forum here and i want to learn about gear ratios, i have always driven 355s and a buddy of mine always outpulled me with the same hp and transmission i couldn't figure out why until he burnt them and when he took them apart they were 370s
so how are they all different?
390 vs 370 vs 355 vs 336, what are the variables to consider when doing a gear swap or tranny swap or hp increase.
rear ends.
Discussion in 'Flatbed Trucking Forum' started by thecrow, Apr 24, 2012.
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I'll throw another wrench into your works, Tall or short rubber.
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3.70's have more "leverage" than a 3.55. That's how he can out pull you.
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The lower the number the less revolutions the driveshaft has to make to turn the wheels. higher number means more power/bottom end with the same hp/tire size/trans etc. lower number means goes faster when you wind her up. higher number means lower top speed and higher rpm to maintain the same speed. somewhere on this site is a link to the eaton road speed calculator.
I.e. same spec'd truck w 3.08 ratio will go 100mph while a 4.33 will pull houses up hills....very slowly.SoDel, SAR, Oxbow and 1 other person Thank this. -
so in other words 336 would run like a beauty on flat land and not so good going uphill, where as 390s would be the opposite?
thanks for the fast replies guys. -
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thanks man that was the very answer i was looking for! and as for being on the flatbed section, it was an accident im still learning my way around the site.
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thecrow Thanks this.
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Sorry, wrong kind. My bad
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