Muncie 4 spd speedometer drive gear
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
ain't easy to eyeball up there. you need a flashlight and a mirror and must form your hands and arms into a pretzel. easier to buy 4 or 5 of the driven gears, they are cheap, and trial and error until you get close. drop the tooth count if your speedo reads slow, increase the tooth count if your speedo reads fast.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
ain't easy to eyeball up there. you need a flashlight and a mirror and must form your hands and arms into a pretzel. easier to buy 4 or 5 of the driven gears, they are cheap, and trial and error until you get close. drop the tooth count if your speedo reads slow, increase the tooth count if your speedo reads fast.
the trans was probably with a 3.73. came to us with a 3.90, now has a 2.73. I have the formula for calculating it, but needed the drive teeth number.
joe
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Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
I had a 4.11 and speedo was way off when I put a 2.73 in.. calculations showed I needed a 16 tooth driven gear.. they don't make them, so I had to buy a reduction/addition gear attachment. I ordered a attachment that would work with a 20 tooth driven gear so I could adjust by 1 or more teeth if I needed further adjustment.
call these guys, they can build you the exact ratio you need....
http://www.ebay.com/itm/Gear-Ratio-A...#ht_500wt_1314
call these guys, they can build you the exact ratio you need....
http://www.ebay.com/itm/Gear-Ratio-A...#ht_500wt_1314
Burning Brakes
Joined: Feb 2002
Posts: 752
Likes: 31
From: Melbourne Australia
Hi,
If you know how many teeth on the plastic driven gear....then count how many tailshaft turns it takes to turn the driven gear say exactly five times.
The number of teeth on the tailshaft gear is then 5 x number of teeth on plastic gear divided by number of tailshaft turns.
Joe
If you know how many teeth on the plastic driven gear....then count how many tailshaft turns it takes to turn the driven gear say exactly five times.
The number of teeth on the tailshaft gear is then 5 x number of teeth on plastic gear divided by number of tailshaft turns.
Joe