primetime5.0

I would like to know how fast im going in 4th at 5k rpm's. The car has 3.55 gear's, stock t5, and 275-40-17's out back, or if there is a link to a calculator please post... tnx

BlackLX

Do you have a friend with a mustang that has the same gears and tire size?

primetime5.0

nope, I guess ill get my brother in law to pace me

90mustang5.8

take it to dyno or the highway

86 5.0L

Your tire's diameter is 25.661 inches
At 5000 RPM in 4th gear, you're moving at 107.525 MPH

00limited7

Someone posted a link to a calculator that you input tire size, gears, and RPM and it would tell you how fast.
I don't remember what thread it is in.

7upedition

spend 10 dollars and get a speedo gear, or else have someone set there cruise and maintain same distance behind them, and that will give you an idea.

samseed101

That was probably me. I have posted it here a dozen or so times. And here is the link to the calculator.

jthorn9

That's it.[8D]

jthorn9

Oh incase you all were wondering, there is nothing wrong with my tranny, but my h pipe and cat backs are falling apart which is OK as I was going to new ones anyways. But I had them check out my rear end and do that little thing with the tire and driveshaft, turns out I have 3.55 gears, which is what I was getting when I plugged all my info into the calculator so all I can say is that little calculator is pretty accurate.