Advice on Changing Speedo Gears....
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
Advice on Changing Speedo Gears....
At 2500 rpm with a 3.08 rear and 26.6" tires (245 60R 15") meter is reading 53 mph should be about 64 mph according to all the online calculators
I have a 40 tooth gear now in a 40 -45 driven gear housing. My speedometer is reading slow. So I need to go to a 38 or 39 tooth gear to speed things up. So I guess I need a different housing that will acoomodate the 34 - 39 tooth gears. That's the aluminum piece the the driven gear runs in.
I Can't really see the drive gear in the tail of the tranny to count the gears, but it appears I have a 15 or 16 tooth gear. The 40 tooth driven would be correct if I had a 17 tooth drive.
Any advice or suggestions would be helpful!!!
thanks
Mark
I have a 40 tooth gear now in a 40 -45 driven gear housing. My speedometer is reading slow. So I need to go to a 38 or 39 tooth gear to speed things up. So I guess I need a different housing that will acoomodate the 34 - 39 tooth gears. That's the aluminum piece the the driven gear runs in.
I Can't really see the drive gear in the tail of the tranny to count the gears, but it appears I have a 15 or 16 tooth gear. The 40 tooth driven would be correct if I had a 17 tooth drive.
Any advice or suggestions would be helpful!!!
thanks
Mark
Melting Slicks
Joined: Apr 2004
Posts: 2,083
Likes: 2
From: Montreal Qc.
Drive gears are identifyable by color (this chart is for 700R4 and some other GM autos, manuals I'm not sure about).
I get my tranny gear info from this page, YMMV if your tranny is not a 700r4.....
http://www.transmissioncenter.net/sp...n_______va.htm
I get my tranny gear info from this page, YMMV if your tranny is not a 700r4.....
http://www.transmissioncenter.net/sp...n_______va.htm
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
Thanks Star 79. I had visited that side too. Lots of godd stuff. May end up calling him for a used housing. The gears and most speedo gear parts for a TH400 are the same for 700....
Mark
Mark
