i just recieved a new speedo gear from 50resto.com, and 2 teeth are pretty much missing. is it completely unusable now? its a 23 tooth if it matters... well now its 21
Broken speedo gear.. will it work or not?
- Thread starter deadlast
- Start date
Missing teeth on a plastic gear means thew speedo will jump all over the place and quickly chew the remaining teeth off. Some pepole have very poor luck with the 23 tooth gear's longivity, some say they work OK.
The stock range of speedo gears work correctly with a limited range of tire sizes. The 23 tooth white gear works good for some guys, but self destructs in a few months for others.
See http://www.corral.net/tech/gearcalc.html for more help
Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.
See http://www.gaugeguys.com/ratioadapt.htm for more info.
The stock range of speedo gears work correctly with a limited range of tire sizes. The 23 tooth white gear works good for some guys, but self destructs in a few months for others.
See http://www.corral.net/tech/gearcalc.html for more help
Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.
See http://www.gaugeguys.com/ratioadapt.htm for more info.
a friend of mine uses the 23 tooth. Actually i have to install one in mine. Anyways he removed his tranny and was amazed at the condition of the tooth. It looked like hell. It almost didnt have any teeth left on it. So he put a new one in. His speedo would not work. Installed the old beat up one and the speedo was back working. It was pretty close to the right speed aswell.
dragnazz5.0
My "0" key d0esn't w0rk, s0 I have t0 use the zer0
probably didnt work too well because the drive gear is torn up as well. im gonna have to figure out what gear i need for my setup....7 tooth drive and 3.90s
dragnazz5.0
My "0" key d0esn't w0rk, s0 I have t0 use the zer0
yeah, i just did a little online calculation and it said i need a 21.8 tooth gear. so i need a 21 or a 23. ive actually got a 21 in it now for my 3.55's and its off just a little bit. when my speedo says 70 im really going like 67. i need a 20 tooth gear for the 3.55s, and ive got one in the car i just havent had time to put it in. ill probably just keep the 21 and see what its like and if need be ill switch to a 23.
im just curious, how do they make a different tooth count gear fit the same tooth drive gear? you wouldnt think you could take a 20 tooth gear and a 23 tooth gear that are the same diameter and get them to run without promblems.
im just curious, how do they make a different tooth count gear fit the same tooth drive gear? you wouldnt think you could take a 20 tooth gear and a 23 tooth gear that are the same diameter and get them to run without promblems.
dragnazz5.0
My "0" key d0esn't w0rk, s0 I have t0 use the zer0
yeah, i figured there would be problems. thats why im probably gonna stick with the 21 and see what happens
Roland69
Sergeant Tangnet
dragnazz5.0 said:
Manual Transmissions with 6 Tooth Drive Gear
Not found in OEM applications
Item Number
Description
N/A
3.08 Gear Ratio / Not possible
C0DZ-17271-A
3.27 Gear Ratio / Maroon 16 Speedo Gear
C3DZ-17271-C
3.55 Gear Ratio / White 17 Speedo Gear
C0DD-17271-B
3.73 Gear Ratio / Yellow 18 Speedo Gear
C0DZ-17271-B
3.90 Gear Ratio / Pink 19 Speedo Gear
C1DZ-17271-A
4.10 Gear Ratio / Black 20 Speedo Gear
C4OZ-17271-A
4.30 Gear Ratio / Red 21 Speedo Gear
Manual Transmissions with 7 Tooth Drive Gear
1983-1989 T-5 OEM
Pre 1993 T-5 Aftermarket
1996-1998 Cobra T-45 OEM
All Tremec Transmissions
Item Number
Description
C0DZ-17271-A
2.73 Gear Ratio / Maroon 16 Speedo Gear
C0DD-17271-B
3.08 Gear Ratio / Yellow 18 Speedo Gear
C0DZ-17271-B
3.27 Gear Ratio / Pink 19 Speedo Gear
C1DZ-17271-A
3.55 Gear Ratio / Black 20 Speedo Gear
C4OZ-17271-A
3.73 Gear Ratio / Red 21 Speedo Gear
Jeep Part #j3167393
4.10 Gear Ratio / White 23 Speedo Gear
Manual Transmissions with 8 Tooth Drive Gear
1990-1995 T-5 OEM
1996-1998 T-45 OEM Except Cobra
Item Number
Description
C0DD-17271-B
2.73 Gear Ratio / Yellow 18 Speedo Gear
C1DZ-17271-A
3.08 Gear Ratio / Black 20 Speedo Gear
C4OZ-17271-A
3.27 Gear Ratio / Red 21 Speedo Gear
Jeep Part #j3167393
3.55 Gear Ratio / White 23 Speedo Gear
Jeep Part #j3167393
3.73 Gear Ratio / White 23 Speedo Gear (Not 100% accurate. This combination will offer the best accuracy without changing the drive gear. Change drive gear to a 6 tooth for complete accuracy. See 6 tooth table.)
Jeep Part #j3167393
4.10 Gear Ratio / White 23 Speedo Gear (Not 100% accurate. This combination will offer the best accuracy without changing the drive gear. Change drive gear to a 6 tooth for complete accuracy. See 6 tooth table.)
Automatic Transmissions with 7 Tooth Drive Gear
1983-1989 Automatic Transmissions
Item Number
Description
D0AZ-17271-A
2.73 Gear Ratio / Blue 16 Speedo Gear
C7AZ-17271-B
3.08 Gear Ratio / Gray 18 Speedo Gear
C7VY-17271-A
3.27 Gear Ratio / Tan 19 Speedo Gear
C8SZ-17271-B
3.55 Gear Ratio / Orange 20 Speedo Gear
D0OZ-17271-B
3.73 Gear Ratio / Purple 21 Speedo Gear
Jeep Part #j3167393
4.10 Gear Ratio / White 23 Speedo Gear
Automatic Transmissions with 8 Tooth Drive Gear
1990-1998 Automatic Transmissions
Item Number
Description
C7AZ-17271-B
2.73 Gear Ratio / Gray 18 Speedo Gear
C8SZ-17271-B
3.08 Gear Ratio / Orange 20 Speedo Gear
D0OZ-17271-B
3.27 Gear Ratio / Purple 21 Speedo Gear
Jeep Part #j3167393
3.55 Gear Ratio / White 23 Speedo Gear
Jeep Part #j3167393
3.73 Gear Ratio / White 23 Speedo Gear (Not 100% accurate.)
Jeep Part #j3167393
4.10 Gear Ratio / White 23 Speedo Gear (Not 100% accurate.)
Now if you really want to change the internal drive gear of your manual tranny you can match it according to the table below. Be aware that the 6 tooth will offer the most combos for numerically higher gear ratios and offer the greatest degree of accuracy. The 6 tooth gear selection table for a manual tranny is the first in the page.
Item Number
Description
E3ZZ-17285-B
6 Tooth Internal Drive Gear / Black
E3ZZ-17285-A
7 Tooth Internal Drive Gear / Yellow
F0ZZ-17285-A
8 Tooth Internal Drive Gear / Green
