Thats what I had thought but according to the 65&66 chev literature that I have there was 4.57, 4.11, gears for the C and P 20 & 5.14 for the C and P 30. Could have been a typo.. All of the 4.10's that I had were from the 70's, so I figured they had made a change at one point in the late 60's. Have you got some option specs for the mid to late 60's trucks?
