Victor,
Only two 820s used the tall shift shaft (Paul -- not input shaft) -- the 820-029 and the 820-037. The shaft on the short (standard) shift shaft is 1/2" (0.500") O.D. The tall shift shaft (P/N 784377) is 9/16" (0.562") O.D. They are the same internally. You can use the tall shift shaft on any late-model 820 (with the full-length 1-1/8" O.D. shift-key cluster-gear shaft), BUT you will need to ream out the shift-shaft hole in the top cover to accept the 9/16" shaft.
The 784377 Tall Shift Shafts are obsolete from Peerless; I have one new-takeoff shift shaft left in stock.
Or...you can make an extension for the short shift shaft, if you're using the between-the-legs shifter. I did this for another Kansas City-area customer. Works well.
And my other posts give all the ratios for the 820s, the MST 200s, and the 700s. They are all interchangeable, but the 820 gears are all cut-steel, heat-treated gears; some of the MST and 700 gears are powdered metal.
Respectfully,
Rodney Rom
