Are all RPM's the same?
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Are all RPM's the same?
I found a chart at http://www.fordsix.com/trucktranny.htm It lists the speeds and RPM's for the 300-6 for each gear for all diffrent types of trannys. My question is if you have two trucks with different engines but same tranny and same rear end, the rpms's are same for both engines at any speed right? Reason I am asking is because I have a 302 with and NP435 and 3.08 gears. On the chart a 300 with same tranny and gears list the rpm's at 65 mph as 2416. So are my rpms also 2416 at 65 mph? When i do the math it come out right.
flyhound
flyhound
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From: Copley, OH
That's my chart! I'm glad someone is using it. As it says at the top it is based on stock 29" tires (235/75-15) at 722 revs/mile. Change the tires, you change the engine RPM. The speed in gears is based on 3500 RPM for the 300. With a 302 you probably want to figure your speed in gears at a higher RPM, probably 4500. In that case multiply the speeds by 1.286.
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so strage ranger are you saying that the rpm's would be different for both 300 and 302. Both trucks identical, same tire size, tranny, rear end. Even color is the same. I assume your speed in gear is speed at peek HP for a 300. I understand that peek HP for a 302 is higher. I don't really care about performance at certain rpm's or speeds. I i'm just curious to if both would have same rpms at 60 mph in 4th gear (1:1). In mind mind it would because it would be direct 1:1 through engine tranny, driveshaft, till you get to rear end where it turns to 3:1 not matter what engine you are running. Especially with a manual tranny (no slippage). I also have a 460 with a c-6 and 3.08 rear end. Wouldn't the rpm on that in 3rd (1:1) be that same as at 300 with a NP 435 in 4th (1:1) and 3.07 rear end. According to your chart the rpms for a 300, NP435, 3.08 would be at 2416. Wouldn't my 460 be that same if tranny and rear end are the same?
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does anyone have or know where there is a similar chart with different engine, tires sizes, trannys, rear ends, etc.?
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