1972 Chevrolet C-10 - Simple C-10 Solutions - Tech
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Last month, Unitrax changed the ring-and-pinion ratio in the 12-bolt from a 3.73:1 to a 3.42:1 with parts from Randy's Ring & Pinion during its rebuild. This meant the speedometer had to be recalibrated since it was reading 10-15 mph slow. This seemed like it would be a fairly easy thing to accomplish since all that needs to be replaced is the speedometer drive gear in the transmission that's easily accessible. Well, I soon found out the local transmission shops won't sell parts, and trying to tell the kid at the big auto parts chain store that I have a '72 C-10 with a 4L60 tranny in it and I just need a speedo gear was futile. Then the light went on-we got the transmission from Gear Star; we'll call them. We told them the tranny, rearend ratio, and rear tire size, and that we had a 42-tooth speedo gear in there now, and they figured out that we needed to swap it out for one with 37 teeth. View Related Article
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