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Re: 72 c10 easy tranny swap
After removing the cover you count the teeth on the ring gear and the pinon gear then divide them to get the ratio. Many times you can find the numbers stamped on one of the gears. 3:73 should be 41 teeth on the ring and 11 on the pinon. 11/41=3.727272 or 3:73. The stampings may look look like (41*11 or 11-41). Here is a link with common ratios.
http://www.crawlpedia.com/gear_tooth_calculator.htm
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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