I think the "C" on the muncie case has been stamped. I thought the assembly plants began stamping the letter for trans designation around December 1968.
My 69 Z-28 10C build date tranny has an assembly date of P9P16 or September 16th 1968 with no letter stamp.
My other 69 Z-28 with an 01B trim tag build date has the trans stamped with the letter designation.
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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