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Author Topic: Speedo Gear Interchange  (Read 6866 times)

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Offline kris kincaid

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Speedo Gear Interchange
« on: July 11, 2005, 07:29:57 PM »
I broke my original speedometer gear, so I went to the Ford dealer for a replacement. The only 19 tooth gear he had was the pink one in the photo. As you can see, the old one has a longer "snout" and the tooth area is larger. I use the pink one often in Tremec TKO transmissions, but I am unsure if it will work as a replacement for the old one I had.


The transmission is a C4 automatic in my '73 Pinto. Thanks!

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Pintony

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Re: Speedo Gear Interchange
« Reply #1 on: July 11, 2005, 08:18:12 PM »
Hello kris kincaid,
 The pink gear should work fine.
I recomend installing it and just see what happens I know I have used long and short snout gears on my Pintos. W/O any problems.
 If the Pink gear fails to work I'll see what I have lying around.
 From pintony
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Offline kris kincaid

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Re: Speedo Gear Interchange
« Reply #2 on: July 11, 2005, 11:17:33 PM »
Thanks for the info. I'll put it in and see what happens!!
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Offline kris kincaid

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Re: Speedo Gear Interchange
« Reply #3 on: July 15, 2005, 08:47:47 AM »
The new gear works perfectly.  :)
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Offline dave1987

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Re: Speedo Gear Interchange
« Reply #4 on: March 23, 2010, 02:25:15 PM »
Does anyone know if the automatic transmission speedometer gears are the same as the ones for the 4-speed manual transmission, or do I need to use a T5 transmission gear?
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Offline 71pintoracer

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Re: Speedo Gear Interchange
« Reply #5 on: March 23, 2010, 05:19:12 PM »
they are all the same, I have a 4 speed Pinto gear in my t-5. I think all of the Ford speedo gears are the same, some are longer or have a longer end but they still work. You are going to need more teeth on the driven gear to slow the speedo down when you swap the rear in your car. I think mine is an 18. When I swapped the rear gear in my sons Mustang I had to get a 21 or 22 from Ford Motorsport. :)
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Offline Mrhydrant

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Re: Speedo Gear Interchange
« Reply #6 on: April 27, 2010, 08:22:33 AM »
My spedo is giving me a high reading, just how many different gears are there?  The gear that is in there now is a 19 tooth.  I'd leave it go but that throws off my odometer too. 
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Offline JerseyJefff

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Re: Speedo Gear Interchange
« Reply #7 on: April 27, 2010, 08:49:57 AM »
 :coolafro:     Hi Guys,,,, excuse me,,  does anyone know where i can get a speedometer that goes up to 120 or better ?  mine only goes up to 80 and i think i streched it to death,, now when i go 40, it says 60 thanks
Jeff                   :rolleye:
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Mike Modified

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Re: Speedo Gear Interchange
« Reply #8 on: April 27, 2010, 11:12:49 AM »
From Ford Racing Parts Catalog

Driven Gear Teeth = Drive Gear Teeth x Axle Ratio x Tire Rev. per Mile / 1000

Drive Gear is usually 7 teeth, although 6 or 8 is available.  Colors: 6-Black, 7-Yellow, 8-Green

Catalog lists 16, 17, 18, 19, 20, 21 Driven gears.

Mike
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Offline Pangra74

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Re: Speedo Gear Interchange
« Reply #9 on: April 27, 2010, 02:55:07 PM »
I had the same situation with my T5 swap. My first T5 took an 19 tooth driven gear to make it right. The new T5 I installed must have a larger drive gear as the speedo is high by 5mph. Gonna go up one more tooth which should slow it enough. Of course, with the high speedo, I'm getting 30mpg! Probably more like 26 or 27.

Joe
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Offline Wittsend

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Re: Speedo Gear Interchange
« Reply #10 on: April 27, 2010, 03:50:57 PM »
FYI, I used the longer gear from my C-4 in my T-5 and had issues.  When the cable housing was tightened down the longer nose caused the cable gear to hit the tranny housing (internally).  It actually rotated with resistance going forward, but when I backed up... the cable gear held (from the friction on the nose) and caused the tailshaft gear to "walk" backwards..., out of mesh.

I tried for hours to get the tailshaft gear forward, but there is a spring clip that I could not get enough pressure on, even with a screwdriver.   As a last resort I found that the thin tubes for an old, stand style, halogen torch light (see image) I had "just" fit over the tailshaft, but wasn't too thick to snag on the seal.  A tap with a rubber hammer put the gear back in place.

But, as has been noted the gears often need to be changed. And, for me, eventually I will have to pull the tailshaft and replace that gear.  In the mean time I used a GPS to get equivilent speeds that I have printed out and taped to my dash.

Tom
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