1968 C-6 Speedometer gear

Clutch, transmission, rear axle

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ML Stephens
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1968 C-6 Speedometer gear

:help: I am rebuilding my 68 F250 camper Special and the Speedometer Gear is bad.
The Truck has a 390 and C-6 trans.
I have looked for a new one at LMC and Mac's but the ones they show don't look similar the one I pulled out???
The ane I pulled out is metal and looks kind off like the ones they sell for the 62s.
Will the plastic ones piece of work, fifty-fifty if they don't expect the aforementioned???
I counted the teeth and mine has 22

Whatsoever one had the same problem?

Thanks for any Help!!

Mark S

ultraranger
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Re: 1968 C-6 Speedometer gear

Mail by ultraranger »

At that place are speedometer drive gears and there are speedometer driven gears.

The bulldoze gear is the one located on the manual output shaft.

The driven gear is the one located on the cease of the speedometer cable.

Typical Ford drive gears come in 6, 7 & 8-tooth counts. Ford driven gears come in 16-21 molar counts. There are 23-tooth driven gears available from the aftermarket (for depression geared rear ends), but the sparse plastic teeth on them more often than not don't last very long before they wear off. I'k unaware of a Ford 22-tooth driven gear.

There are bulldoze/driven gears with left hand teeth and ones with right hand teeth. Left mitt gears are for Ford transmissions where the speedometer cable goes into the transmission housing on the rider side. Right hand gears go into the transmission housing on the drivers side (similar a C-6).

You would have to remove the tail housing of the manual to get an authentic count on the driven gear (the gear on the output shaft), but this is how you decide the tooth count on it; http://world wide web.transmissioncenter.net/IMG_0816.JPG

http://www.bgsoflex.com/speedo1.html

http://world wide web.transmissioncenter.internet/speed ... Older_Ford

Steve

1969 SWB F100 Ranger. 240-6, C-four, ix" N-case 31-spline Traction-Lok w/3.fifty gears.

1968 Mustang. My high school car. Owned since 1982.

2003 Azure Blue Mustang Mach1.

ML Stephens
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Re: 1968 C-6 Speedometer gear

Post by ML Stephens »

Thanks, I looked at the "Driven "gear over again and you are right. Its got eighteen teeth.
Information technology helps if I wear my glasses!.
I have not pulled the tail housing a part to look at the bulldoze gear yet.
Even so the ones I tin find on-line don't look like the one I pulled out. Will they work?

mmerlinn
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Re: 1968 C-6 Speedometer gear

Post past mmerlinn »

ML Stephens wrote: All the same the ones I tin can find on-line don't look like the one I pulled out. Will they work?

Possibly. Possibly non. Depends on what the difference(due south) are.

mmerlinn (http://mmerlinn.com/itemize/makeridx.htm)

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ultraranger
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Re: 1968 C-half dozen Speedometer gear

Post by ultraranger »

If the driven gear on the end of your truck's speedometer cable has the teeth worn off of it, there's a good possiblity that the drive gear teeth on the output shaft are worn besides.

I'grand not sure how uniform a plastic driven gear would exist if meshed with a metal drive gear (or vise-versa). You would probably be better off to alter BOTH gears out to the newer plastic version. Both gears would exist made of the aforementioned material, they would both be new, and they would article of clothing in as a matched fix.

Steve

1969 SWB F100 Ranger. 240-6, C-four, 9" N-case 31-spline Traction-Lok w/3.50 gears.

1968 Mustang. My high school auto. Endemic since 1982.

2003 Azure Blueish Mustang Mach1.

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Art
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Re: 1968 C-vi Speedometer gear

Post by Art »

ultraranger wrote:If the driven gear on the stop of your truck's speedometer cable has the teeth worn off of information technology, there's a good possiblity that the drive gear teeth on the output shaft are worn as well.

I'k non certain how compatible a plastic driven gear would be if meshed with a metallic bulldoze gear (or vise-versa). You would probably exist ameliorate off to change BOTH gears out to the newer plastic version. Both gears would be made of the same cloth, they would both exist new, and they would habiliment in every bit a matched set.

Very good communication. :thup:

I know Chrysler successfully used a steel gear (machined into the output shaft) to drive the speedometer, simply they also used an eccentric to set the gear mesh.

I would recommend replacing both if you are not comfortable inspecting and determining whether the drive gear is worn or not.

Be sure yous become the correct helix (right hand / left manus) driven gears.

You tin count the drive gear teeth by looking at how many teeth terminate at the flat side of the gear.

Sometimes the color of the plastic helps identify the gear tooth count.

owner of several 67-72 likewise as 73-79 Ford trucks

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