Speedo Gear

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May 21, 2011 | 07:15 AM

zygowsra

Thread Starter

Racer

Joined: Jan 2008

Posts: 292

Likes: 3

Speedo Gear

69 Big Block
What color how many teeth for a transmission speedo gear. 427, 390 HP, M22, 4 spd with 4.56 rear end?

May 21, 2011 | 07:26 AM

Garys 68

Melting Slicks

Joined: Sep 2004

Posts: 2,655

Likes: 19

Check this link
http://www.stl-vettes.com/65Vette/GearCalc.htm
And if the drive gear is not correct, and you dont want to disassemble the trans, get an adapter.http://www.transmissioncenter.net/sp...n_______va.htm

May 26, 2011 | 07:51 AM

zygowsra

Thread Starter

Racer

Joined: Jan 2008

Posts: 292

Likes: 3

Very good info.
Thank you.

May 26, 2011 | 08:58 AM

wombvette

Le Mans Master

Joined: Jan 2000

Posts: 8,918

Likes: 27

From: New Hill NC

According to the parts book.

Drive Gear 6261794

w/ 855-15 tires 3860342
w/ 825-15 G70 G78 3987920 blue 20

Also shows adapter 3932220

May 26, 2011 | 11:57 AM

69MA

Instructor

Joined: Apr 2004

Posts: 201

Likes: 1

From: Taunton Ma

I had the same problem and found this site helpful. towards the bottom of the page he talks about ratio adapters which are still available from GM. I don't remember paying the price he quoted i seemed to think it was in the 35.00 dollar range.
http://chevelleengineer.home.comcast...eer/speedo.htm