71 3 speed C6 automatic transmission shifting

JJHstang

5 Year Member
Sep 12, 2018
204
11
18
Fort Worth, TX
At about what speeds should my 1971 Mach 1 shift gears. I believe the 3 speed transmission is a C6. Engine is a 351 Winsor single exhaust.
It now shifts into 1st around 10 mph, 2nd around 45 but not sure about 3rd.
 
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I posted my question wrong. Should have read.
Do my Shifting speeds in my 1971 Mach 1. 3 speed C6 transmission. Engine is a 351 Winsor V4 single exhaust seem correct?
It now shifts 1st to 2nd between10 to 12 mph, 2nd to 3rd between 45 to 50 mph.