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Charlie69 last won the day on August 16 2018
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Let me do a little more investigation to see if the speedometer pinion that came with the 1980 720 transmission is the correct one for my truck.
The 1980 720 L20B 5 speed uses a 3.899 Gear ratio. If you swapped the third member from the 1980 Truck then the speedometer should read correctly.
Crashdt420 used his speedometer drive pinion from his 4 speed by cutting a hold down notch 180 degrees from the original notch.