Speedometer Drive Gear
#1
Speedometer Drive Gear
Hey guys. I'm new to the forum.
I recently purchased a '61 F-100 with a 292 y-block v8 and 3-speed on the column, and I've been working on getting it in driveable shape.
I noticed that the speedometer wasn't working so I started investigating.
To make a long story short I found that the speedometer drive gear in the tailshaft of the transmission is stripped out. When I stick my finger in the hole where the speedometer cable goes it feels completely slick.
The driven gear, cable, and speedometer are all ok. (I had my wife watch the speedometer to see if it moved while I spun the driven gear by hand.)
So, how do I replace the speedometer drive gear in the tailshaft of the transmission? Also, where is the best place to purchase one?
thanks,
Michael
I recently purchased a '61 F-100 with a 292 y-block v8 and 3-speed on the column, and I've been working on getting it in driveable shape.
I noticed that the speedometer wasn't working so I started investigating.
To make a long story short I found that the speedometer drive gear in the tailshaft of the transmission is stripped out. When I stick my finger in the hole where the speedometer cable goes it feels completely slick.
The driven gear, cable, and speedometer are all ok. (I had my wife watch the speedometer to see if it moved while I spun the driven gear by hand.)
So, how do I replace the speedometer drive gear in the tailshaft of the transmission? Also, where is the best place to purchase one?
thanks,
Michael
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One size does not 'fit all.'
There is more than one DRIVE gear: Could have 6, 7 or 8 teeth. Some teeth run this-away: ///// .. some teeth run that-away: \\\\\
Some are steel, some are nylon, as it depends on the application. There are different inside diameters, as the DRIVE gears are certain years specific.
DRIVE and DRIVEN gears are determined by the series, wheelbase, trans type, rear axle ratio and the tire size, which can be a pain, since the bias-ply tire sizes used 'back then' are different today with radials.
1961 F100 292 3 speed M/T could have a 3.70, 3.89, or 4.11 ratio. Short wheelbase uses a different DRIVE gear than long wheelbase.
The DRIVE gears have stamped ID numbers marked on them.
There is more than one DRIVE gear: Could have 6, 7 or 8 teeth. Some teeth run this-away: ///// .. some teeth run that-away: \\\\\
Some are steel, some are nylon, as it depends on the application. There are different inside diameters, as the DRIVE gears are certain years specific.
DRIVE and DRIVEN gears are determined by the series, wheelbase, trans type, rear axle ratio and the tire size, which can be a pain, since the bias-ply tire sizes used 'back then' are different today with radials.
1961 F100 292 3 speed M/T could have a 3.70, 3.89, or 4.11 ratio. Short wheelbase uses a different DRIVE gear than long wheelbase.
The DRIVE gears have stamped ID numbers marked on them.
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I have a 1963 unibody and a similar problem with the cable on the manual transmission. Does anyone know what to look for. I see the top of a plastic gear in the hold but no place to put the end of the speedometer cable. Help! Ken Barnes at kenbarnes54@gmail.com.
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There are a few things that factor into speedo gear selection
Year
Rear Axle Ratio
Transmission
Tire Size
All of the gears in the MPC assume bias ply tires, but most everyone runs radials these days so you have to also do a tongue in cheek estimate as to the bias ply size equivalent of radials. So, there is a little guess work to it even after you nail down some specifics.
Year
Rear Axle Ratio
Transmission
Tire Size
All of the gears in the MPC assume bias ply tires, but most everyone runs radials these days so you have to also do a tongue in cheek estimate as to the bias ply size equivalent of radials. So, there is a little guess work to it even after you nail down some specifics.
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