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  •  » Just some trivia-speedometer gear test

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    5/07/2021 2:18 PM  #1

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,258

    Just some trivia-speedometer gear test

    Speedometer gear tooth count

    245x45/17 tire
    3.50:1 gear ratio
    Tremec TKO600 tranny (7 tooth gear)
    20 tooth speedo cable gear

    Verified with GPS speedometer app on my phone. 60 mph checks correct.  80 mph checks correct

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    5/07/2021 4:55 PM  #2

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,887

    Re: Just some trivia-speedometer gear test

    Any vibes at 80?

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    5/07/2021 4:56 PM  #3

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,258

    Re: Just some trivia-speedometer gear test

    Different conversation, Bullet...

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    5/07/2021 7:56 PM  #4

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,853

    Re: Just some trivia-speedometer gear test

    MS wrote:

    Different conversation, Bullet...

    So it's still....Grrrrrrrrrrrrrrr!?!
    6sal6
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    5/08/2021 5:44 PM  #5

    RV6
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    From: Pine Junction, CO
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    Re: Just some trivia-speedometer gear test

    Same gearing different tire. 7 tooth drive with a 20 tooth driven. About 3 mph off at 70.

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    5/08/2021 9:20 PM  #6

    MS
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    From: Canyon Lake, Texas
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    Re: Just some trivia-speedometer gear test

    RV6 wrote:

    Same gearing different tire. 7 tooth drive with a 20 tooth driven. About 3 mph off at 70.

    What tire size?

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    5/09/2021 1:52 PM  #7

    RV6
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    From: Pine Junction, CO
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    Re: Just some trivia-speedometer gear test

    MS wrote:

    RV6 wrote:

    Same gearing different tire. 7 tooth drive with a 20 tooth driven. About 3 mph off at 70.

    What tire size?

    225/50R16
     

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    5/11/2021 12:55 PM  #8

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
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    Re: Just some trivia-speedometer gear test

    225/60-15
    3.89 gear ratio
    Tremec T5 'World Class" (w/7-tooth trans gear; Tremec spec, not confirmed by myself)
    21 tooth speedo gear

    Also verified with GPS (NUVI); at 40, 60, 80 MPH checks, all agree w/Speedometer (1966 OEM Speedometer)

     

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    5/12/2021 12:04 PM  #9

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
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    Re: Just some trivia-speedometer gear test

    MS wrote:

    Speedometer gear tooth count

    245x45/17 tire
    3.50:1 gear ratio
    Tremec TKO600 tranny (7 tooth gear)
    20 tooth speedo cable gear

    Verified with GPS speedometer app on my phone. 60 mph checks correct. 80 mph checks correct

    Same tire size
    Same gear ratio
    Same TKO 600 transmixer ( don't know what gear is installed in transmixer)
    19 tooth pink gear as spec'd by Modern Driveline. I'm about 5 mph off at 70
     

    John  -- 67 Mustang Coupe 390 5 speed
     

    5/13/2021 1:00 PM  #10

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,258

    Re: Just some trivia-speedometer gear test

    Bolted, put a 20T in it and it will be spot-on.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    5/13/2021 9:09 PM  #11

    Bolted to Floor
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    From: Houston, Texas
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    Re: Just some trivia-speedometer gear test

    That’s what I was thinking!!

    John  -- 67 Mustang Coupe 390 5 speed
     

     

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