I checked tonight & I stand corrected. It read 80 mph at 4600 rpm.I verified today my recollection was correct. 4,000 RPM in 3rd is 60 MPH. Redline, 600 RPM later, would be 70 MPH +- a smidge. Rev limiter at 5100 RPM is 75 MPH.

Since 30 MPH is 2K RPM, and 60 MPH is 4K RPM, 90 MPH would be 6K RPM. You got a gasser?

Gear ratios on PDs aren't that much different.

For those with 6-speeds, redline in 3rd might be 90 MPH?

This has been my experience too.