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The Water Cooler
General Discussion
Any Transmission Guys here?
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<blockquote data-quote="swampratt" data-source="post: 4246446" data-attributes="member: 15054"><p>Here is some math I keep in my head to find out RPM for given gear ratios.</p><p></p><p>336 is a given.</p><p>336 X gear ratio X MPH divided by Tire diameter = RPM</p><p></p><p>If you have 4.10 gear and go to 3.55.</p><p>336 x 411 x 65 divided by 31=2,895 RPM</p><p>336 x 355 x 65 divided by 31 =2,510 RPM</p><p></p><p>Now for a non lockup automatic transmission you must allow some for torque converter slippage.</p><p></p><p>If you want to know the rpm in first gear you must multiply first gear ratio by rear end ratio.</p><p></p><p>If you have an overdrive in high gear take that number and use it.</p><p></p><p>say .75 OD ratio </p><p>.75 X 2,895 rpm =2,171 RPM</p></blockquote><p></p>
[QUOTE="swampratt, post: 4246446, member: 15054"] Here is some math I keep in my head to find out RPM for given gear ratios. 336 is a given. 336 X gear ratio X MPH divided by Tire diameter = RPM If you have 4.10 gear and go to 3.55. 336 x 411 x 65 divided by 31=2,895 RPM 336 x 355 x 65 divided by 31 =2,510 RPM Now for a non lockup automatic transmission you must allow some for torque converter slippage. If you want to know the rpm in first gear you must multiply first gear ratio by rear end ratio. If you have an overdrive in high gear take that number and use it. say .75 OD ratio .75 X 2,895 rpm =2,171 RPM [/QUOTE]
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