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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Finally got speedometer dialed in on the 69

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    8/14/2024 4:53 PM  #1

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,172

    Finally got speedometer dialed in on the 69

    69 Mustang
    3,50:1 rear gear
    T5 five speed transmission, 0.67:1 overdrive
    235x60R15 tires
    Drive gear in the tranny has seven teeth (yellow color)
    Installed 20 tooth driven gear (black color gear)

    Checked with my MPH app on the phone, and it is within 1/2 MPH.  I call it a success!

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

    8/14/2024 5:30 PM  #2

    Rufus68
    I FYI 24-7

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    From: Knoxville, TN
    Registered: 4/26/2017
    Posts: 868

    Re: Finally got speedometer dialed in on the 69

    That's great.  It seemed common for me to have factory speedos be at least 2mph optimistic at highway speed.

    1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
     

    8/14/2024 6:22 PM  #3

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 1,638

    Re: Finally got speedometer dialed in on the 69

    I would call it a success as well.  It’s a good feeling when you get something dialed in.

     

    8/14/2024 10:50 PM  #4

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,601

    Re: Finally got speedometer dialed in on the 69

    That's a whole lot more success than I've had today. Can't wait for the day to be over. The only good news I had today was my car broke down at home

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    8/15/2024 12:58 AM  #5

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Finally got speedometer dialed in on the 69

    I will be glad to get mine to that point.

    Its really me....I fixed my caps lock .
     

    8/15/2024 8:14 AM  #6

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,574

    Re: Finally got speedometer dialed in on the 69

    Glad you got it worked out. 

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

    8/15/2024 8:36 AM  #7

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,172

    Re: Finally got speedometer dialed in on the 69

    BILLY WALTON from GEORGIA wrote:

    I will be glad to get mine to that point.

    Billy, your car should use a 20t also, if you have a yellow, seven tooth drive gear.

    I bought the gear on ebay for $12.95 shopped. Like everything else, they were around $4.95 pre-covid

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

    8/15/2024 9:03 AM  #8

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Finally got speedometer dialed in on the 69

    MS wrote:

    BILLY WALTON from GEORGIA wrote:

    I will be glad to get mine to that point.

    Billy, your car should use a 20t also, if you have a yellow, seven tooth drive gear.

    I bought the gear on ebay for $12.95 shopped. Like everything else, they were around $4.95 pre-covid

    I bought one a while back I need to run it over to my buddy while its on the lift.

     

    Its really me....I fixed my caps lock .
     

    8/15/2024 9:14 AM  #9

    John Ha
    I FYI 24-7

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    From: Mitchell, SD
    Registered: 4/02/2013
    Posts: 902

    Re: Finally got speedometer dialed in on the 69

    MS wrote:

    69 Mustang
    Checked with my MPH app on the phone, and it is within 1/2 MPH.  I call it a success!

    Not to be overly critical, but the speed difference is actually a percentage.  The MPH difference will vary with speed.  For example, my SUV speedo reads .5% less than my actual speed.  So at 25 mph, my actual speed is 1.25 mph less than the speedometer reading.  At 70 mph indicated, my actual speed is 3.5 mph less than indicated.

    Founding Member of the Perpetually Bewildered Society
     

    8/15/2024 10:26 AM  #10

    Rufus68
    I FYI 24-7

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    From: Knoxville, TN
    Registered: 4/26/2017
    Posts: 868

    Re: Finally got speedometer dialed in on the 69

    John Ha wrote:

    MS wrote:

    69 Mustang
    Checked with my MPH app on the phone, and it is within 1/2 MPH.  I call it a success!

    Not to be overly critical, but the speed difference is actually a percentage.  The MPH difference will vary with speed.  For example, my SUV speedo reads .5% less than my actual speed.  So at 25 mph, my actual speed is 1.25 mph less than the speedometer reading.  At 70 mph indicated, my actual speed is 3.5 mph less than indicated.

    It's pretty reasonable to assume he checked it with his phone going between 45 and 70, so if he has only 1/2mph difference it is very good.  No percentage needed.
     

    1968 T-code Coupe with a 302.  Nice car, no show stopper for sure, but I like it.
     

    8/15/2024 5:57 PM  #11

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,172

    Re: Finally got speedometer dialed in on the 69

    I check at 60 and 70..  No other speeds will be off significantly when it reads exact at 60

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

     

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