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I thought mine was a 1.667 as the serial number is 20D.......B but the revs & speed didn't seem right so popped the cover off the bottom and counted the teeth:

A = Gear on PTO / Input shaft (26)

B = Middle gear in intermediate shaft (41)

C = Low gear on intermediate shaft (19)

D = Low gear on prop output shaft (40)

E = High gear on intermediate shaft (38)

F = High gear on intermediate shaft (34)

Low ratio = 1/((A/B)*(C/D))

High ratio = 1/((A/B)*(E/F))

Low = 1/((26/41)*(19/40)) = 3.32

High = 1/((26/41)*(38/34)) = 1.411

I think a previous owner has swapped ratios from another box :unsure:

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