If you will go to the "Tons of Fun forum, There is a LENGTHY article titled "Anyone change out their 5.17:1 diff gears?" concerning 4:10/4:11 gear sets from 1967 thru 1972 which are a DIRECT bolt in for our 1947 thru 1953 3800 ONE TON TRUCKS. If you have any questions, that forum is the place to ask concerning 3800 trucks. Jerry
