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1966 with 302ci, T5 installed about 10 years ago by previous owner, 3.55 rear.

I was at the speedo calculator website (Mustang Speedometer Gear Calculator - LMR.com) because my speedo reads about 5mph faster than actual.

It asks what type T5 I have -- just finding out that there are several types of Tremec T5 trannies that have different "toothed" speedometers.
How can I find out which t5 I have -- or can I check how many toothed speedo I have without pulling the speedo gear?
6, 7, or 8 teeth?
Thanks.

Here's what the website says:
6 Tooth
  • The black 6 tooth internal drive gear was originally used in the 4 speed tranny, but works great to exactly correct for 4.10s when used with a pink 19 tooth driven gear.
  • 83-89 T5 has a yellow 7 tooth internal drive gear
  • 90-95 T5 has a greenish/yellow 8 tooth internal drive gear
  • FRPP M-7003-Z T5 has a yellow 7 tooth internal drive gear
7 Tooth
Select this if you have a:
  • factory 1983-1989 Mustang T5 or AOD
  • Ford Racing M-7003-Z World Class T5
  • Tremec 3550, TKO, TKO 500, TKO 600
  • Tremec T56 Magnum
1996-1998 Cobra T45

8 Tooth
Select this if you have a:
  • factory 1990-1995 Mustang T5, AOD, AODE
  • 1996-1998 GT T45, AODE, 4R70W
  • 1994-1998 V6 T5, AODE, 4R70W
 

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Just see how many teeth are on your current driven gear and get the gear with the next higher count. That will slow down the cable, resulting in a slower speed reading.
 
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