Speedometer Drive & Driven gear
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 954
Likes: 40
2022 C3 of the Year Finalist - Modified
Speedometer Drive & Driven gear
I have some questions, maybe someone know and can help me.
I just changethe diff' in my car a 68 327 Hi Pre' manual M21.
The original diff' was 411 and I changed it with 336, now the car run faster with low rpm (-650) but the speed on the speedo' is not correct.
1.Does someone know what Speedometer driven gear I need,
(how many teeth & color).
2.Does someone know if I need also to change the Speedometer drive
gear inside the transmission?
3.Does someone have a chart with the gear color and teeth for each
gear ratio and transmission
Thanks, Avner
I just changethe diff' in my car a 68 327 Hi Pre' manual M21.
The original diff' was 411 and I changed it with 336, now the car run faster with low rpm (-650) but the speed on the speedo' is not correct.
1.Does someone know what Speedometer driven gear I need,
(how many teeth & color).
2.Does someone know if I need also to change the Speedometer drive
gear inside the transmission?
3.Does someone have a chart with the gear color and teeth for each
gear ratio and transmission
Thanks, Avner
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
One of the aftermarket providers (ZIP, Eckler's, CC -- can't remember which) has a chart in their catalogue. You should be able to match your ratio to the correct color drive and driven gears.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
I have some questions, maybe someone know and can help me.
I just changethe diff' in my car a 68 327 Hi Pre' manual M21.
The original diff' was 411 and I changed it with 336, now the car run faster with low rpm (-650) but the speed on the speedo' is not correct.
1.Does someone know what Speedometer driven gear I need,
(how many teeth & color).
2.Does someone know if I need also to change the Speedometer drive
gear inside the transmission?
3.Does someone have a chart with the gear color and teeth for each
gear ratio and transmission
Thanks, Avner
I just changethe diff' in my car a 68 327 Hi Pre' manual M21.
The original diff' was 411 and I changed it with 336, now the car run faster with low rpm (-650) but the speed on the speedo' is not correct.
1.Does someone know what Speedometer driven gear I need,
(how many teeth & color).
2.Does someone know if I need also to change the Speedometer drive
gear inside the transmission?
3.Does someone have a chart with the gear color and teeth for each
gear ratio and transmission
Thanks, Avner
