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Is there any to change out the speedometer drive gear without removing the transmission? (4 speed toploader)

I have tried every driven gear I can find wihtout successfully getting the speed indication right. They all seem to indicate too slow.

Ihave 195-70-14 tires
3.25 rear end
4 spd trans

65 conv "c" code
 

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I think changing the gear within the tranny is a pretty big job, and is some trannies it doesn't even come out... HOWEVER, something you may want to look into is a gear correction box... I am in the same position as you, I need a 23 tooth gear (non-existant), and considered buying one. I searched on Yahoo for "speedometer" and got a few hits, and found one called the speedometer shop or something. I called them and they said it would be about 60 or 70 bucks, too rich for my blood, but might be just what you are looking for. Good luck!

-Jason

'72 Mach 1 || '90 Talon TSi AWD
http://nosaj122081.tripod.com/parade3.jpg
"Thats not a leak, my car's marking its territory!"
"If you've done it, it ain't braggin'." -Roy Rogers
 

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I believe you need to remove the tranny tailshaft housing to gain access to the drive gear. Try different driven gears first.

[color:blue]
1967 Acapulco Blue coupe
302 4V, C4, 9" 3.25:1
Torq-Thrust "D" 225-60-14
1968 PDB, Corbeau
LeCarra, Alpine in-dash CD
http://www.geocities.com/mlnielsen_67/index.htm
WEBSITE UPDATED 3/25/01
</font color=blue>
 

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Sorry, didn't read the second line about trying different driven gears.

Try this formula:

Driven gear teeth= drive gear teeth X axle ratio Xtire revolutions per mile / 1000

(5280ft/mi)

If that doesn't work, I've got a magazine article around here somewhere.

[color:blue]
1967 Acapulco Blue coupe
302 4V, C4, 9" 3.25:1
Torq-Thrust "D" 225-60-14
1968 PDB, Corbeau
LeCarra, Alpine in-dash CD
http://www.geocities.com/mlnielsen_67/index.htm
WEBSITE UPDATED 3/25/01
</font color=blue>
 
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