The Ford Barn - View Single Post - Social group for 41-48

MN47Ford · 05-23-2010, 03:04 PM

The standard was a 3.78 ratio. Stamped on the differential housing would be 9/34 for the 3.78 if by some chance you had the 4.11 its stamp would be 9/37. Mine revs about 2500 revs at 55 with a 3.78 ratio and 15" coker radials. The 3.78 ratio revs around 200 rpm lower than a 4.11 ratio at every speed from 45-65 MPH

05-23-2010, 03:04 PM	#29
MN47Ford Junior Member Join Date: May 2010 Location: Minnesota Posts: 10	Re: Social group for 41-48 The standard was a 3.78 ratio. Stamped on the differential housing would be 9/34 for the 3.78 if by some chance you had the 4.11 its stamp would be 9/37. Mine revs about 2500 revs at 55 with a 3.78 ratio and 15" coker radials. The 3.78 ratio revs around 200 rpm lower than a 4.11 ratio at every speed from 45-65 MPH