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It is indeed a lot to figure out with other ways to get to the same result. We figured out the math this way and created the calculator long ago so that we can figure out the drive shaft RPM on any vehicle. It is easy to apply it to just about anything without knowing the transmission gear...

You are right, I made a typo when figuring the rpm at 75 I entered 1.2 on the calculator instead of 1.25. Good catch. I hesitate to even say that the shaft is potentially safe up to 150 mph because I don't want to seem like I'm saying "100 max speed, wink wink, you can really drive 150". I'm...

Here's a couple screenshots of the backend of the calculator, for those of you who understand math better than I can explain it. :) The formula for each mathy step is in the bottom right corner where it says "formula editor"

Here's the math to determine drive shaft RPM. 20168/tire diameter in inches = x, (X)ring and pinion gear ratio = drive shaft rpm at 60mph. 20168 is the number we have figured out but you can check the math by finding the circumference of a tire (lets use 30 inches as an example for tire...

This, gentlemen, is the point that I think we all need to remember. That for some people the stock shaft shudder is so bad that it makes them want to sell their brand new truck. There's obviously a serious problem. No, not with every truck, there's an element of luck involved. But for those who...

I know you said you found the answer but I still want to give you a better answer. 1 - We don't have access to boots that will fit the slip yoke and tube diameter being used on these shafts. Instead we use a sliding rubber seal, sort of like a wiper seal, and grease fitting. This needs to be...

Knowledge is power. I've written a lengthy response to some of the questions concerning critical speed. Because it is so long I've saved it as a file, accessible on our website. Here is the link...

Phil. I was actually being sincere in my request for more information. I have looked up multiple critical speed tables. The results vary wildly. That is why I was asking for clarification. What do I think I'm baiting you to do? Objectively answer a couple engineering questions so people better...

I've been thinking about how I rhetorically asked the question "Whose critical speed calculations are we using?" I'd like to re-ask that question non-rhetorically. I do not have an engineering degree, I'm just a fairly intelligent person who has been in the drive shaft industry for most of my...

Hi guys, Shawn Wood from Tom Wood’s here. I wanted to chime in on a couple things being discussed here and clear the air a bit. From a previous post: “I've been waiting for them to be in stock. Now that they have them they increased the price more than $100. With shipping it's probably $800...