Re: Muncie Speedo Gear Question
 

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What color gears did you find that were close?

Paul

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Sorry Paul, memory isn't that good. Also, at that time, it wasn't the most important thing in the world so it doesn't stick in your mind.

Re: Muncie Speedo Gear Question
 

THE GM PARTS BOOK SHOWS
6261784 8T DRIVE NATURAL
3987920 20T DRIVEN BLUE
THE OTHER LISTING WITH AN ADADPTOR IS FOR A CHEVELLE
MIKE

Re: Muncie Speedo Gear Question
 

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The adapter on our Chevelle has the white gear and is stamped 666F N8. I can only read the last two numbers on the next line "33".

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Probably .7333 or .8133. I have a couple of those here to try to match up to my COPO.

I've also managed to secure this cool bundle of parts to allow me to make up whatever ratio I end up needing...

http://imagehost.vendio.com/bin/imag...driveparts.JPG

http://imagehost.vendio.com/bin/imag...riveparts1.JPG

http://imagehost.vendio.com/bin/imag...riveparts2.JPG

I've seen lots of the SW versions but never an AC version, which Ed C. is supposed to have come on the car. Anybody got a picture?

Re: Muncie Speedo Gear Question
 

Wow Jeff, VERY impressive to say the least! Neat stuff! https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Re: Muncie Speedo Gear Question
 

CHEVELLE ADAPTOR #3932220 STAMPED .7333-A
# 3890575 STAMPED .8319
#3925673 STAMPED 1.1111-V
MIKE

Re: Muncie Speedo Gear Question
 

Wow, I think my head is going to explode. I opened up a can of worms on this one!

I guess I will try what I have and see how far off it is, then make adjustments later.

69L78 - Do you have a number on your adapter since you have the same gears and trans # as mine?

Thanks,

Paul

Re: Muncie Speedo Gear Question
 

The adaptor # is 6476736 with a 1:.777 ratio and I believe the gear is a blue one with 20 teeth.

Re: Muncie Speedo Gear Question
 

I saw those gears/parts were for sale on Ebay recently Jeff.
I thought of you right away,you adapter Monkey! https://www.yenko.net/ubbthreads/imag...mlins/grin.gif

Re: Muncie Speedo Gear Question
 

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The adaptor # is 6476736 with a 1:.777 ratio and I believe the gear is a blue one with 20 teeth.

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Can you post a pic of the adapter? That sounds like the AC part number that Ed C. quotes...

Re: Muncie Speedo Gear Question
 

Here is the info on my 69 L78 M-21, 4.10 posi. The tag on the sidecover is 3950316 and the adaptor is 6476736 with a ratio of 1:.777 and has a blue driven gear with 20 teeth. I also have a 69 RS Z/28 with an M-21 and 4.10 posi and no adaptor. The tag on the sidecover is 3946798 and has a driven white gear with 25 teeth. Attached are pics of the adaptor.