[craigh]

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

 

[nosaj122081]

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

 

[mlnielsen]

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>

 

[7DMACH1]

I have a 70 mach 1 with a four spd top loader and 4.30 rear. I bought a 23 tooth speedo gear from Down Ford in Toms River NJ. It cost about $15.00.

1970 MACH 1 351C 4V 4SPD. 1986 MERCURY CAPRI 5.0 5SPD. PHILA. PA.

 

[mlnielsen]

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>

 

[Billgear]

Jeep makes a 23 tooth that will work fine, part #J3167393

Regards,
BillGear

1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg