One of the numerous differences in the new 1947 Advance Design trucks is the different position of the mounting tabs on the speedometer. Reasons for doing this on both Chevrolet and GMC are as follows: with the introduction of this body style in mid-1947, both 3 and 4 speed transmissions were the floor shift design. However, in 1948 with the introduction of the 3 speed column shift transmission, the new shift linkage was now parallel and above the steering column. The distance between the two lower tabs on the speedometer case was widened from 4-3/4' to 6'. This got the tabs away from the new shift linkage.
The person restoring a 1947 Chevrolet or GMC should be aware of this change. If he turns in his speedometer core to a re-builder on exchange, chances are good he will not receive a 1947 style in return. Few, if any, re-builders will notice this tab repositioning and will exchange from their stock!
1947 Left | 1948 Right (above)
1947 Left | 1948 Right (above)
