raboy

I know this isn't the correct way to answer this question, however, my question is regarding an estimate of my rear end final drive ratio in a 67 427/435 if at 60mph in 4th the rpm is 2100. Any estimates would be helpful and may save me from jacking it up, spinning the tires and watching the drive shaft.

Bill Irwin

What size tires? Bill.

JohnZ

Can't answer that question without knowing if your speedo is accurate - have you checked it? I doubt if it is, as the gear calculator with your numbers (assuming stock 27" tires) says you have a 2.81 axle, which is highly unlikely.

Dan Hampton

http://www.offroaders.com/info/tech-...ng/mph-rpm.htm

Kensmith

Here is a easy calculator:

http://www.5speedtransmissions.com/gear_calculator.html

raboy

Once again, you guys come through and thanks a bunch. Checking the numbers and plugging it in to the formula, I get 3.23 (+/-) which confirms suspicions already held.