Nearly 15MPG with 4.57's and no OD in a C30!

[66Submarine]

A combination of a tach error in the truck and a speedo error in the pace car had suggested the truck I'm driving had 4.10 gears, but the numbers didn't quite agree with the speedo app I downloaded onto my phone (they also didn't seem to agree with the numbers for 4.57's).

I ran it up to a little over 3,100RPM yesterday and the numbers pretty much agreed with 4.57's like I originally thought it had--65MPH.

Checked it out again and there we go--4.57's. The tach apparently reads low at the speeds where I normally drive.

The '63 I bought actually does have a 4.10 third member in it, so I'll swap it in shortly. I've been driving with the flow of traffic, so I expect I'll get a little fuel economy boost with the reduced engine speed of the taller gears.

I got just a touch less than 15MPG driving across Atlanta to Conyers the other day. Not too bad for an old one ton truck IMO!

More to come after I swap the taller gears in...