speedo reduction box
 

Did the COPO Chevelles use these??

http://cgi.ebay.com/ebaymotors/ws/eBayIS...A%3AIT&rd=1

If so I need to get one...part # ??? Thanks

ALbert

Re: speedo reduction box
 

Albert,

Read THESE THREADS. It'll 'splain everything.

Ed

Re: speedo reduction box
 

Al, This is the original one on my 69 L78 Camaro with M-21 and 4.10 gears.

Re: speedo reduction box
 

Is there a pin or key that goes from the reduction unit to the speedo gear? I still can't get mine to work properly https://www.yenko.net/ubbthreads/imag...emlins/mad.gif

Re: speedo reduction box
 

Someone find Marlin that Damn pin!

Re: speedo reduction box
 

I have the Damn pin, (technically a 'key') but something still aint jivin https://www.yenko.net/ubbthreads/imag...emlins/mad.gif

Re: speedo reduction box
 

Marlin, Attached is pic of the key that goes inside the gear and reduction unit, it is 1 13/16" long. If you can't get it working, just sell me the damn old Nova.

Re: speedo reduction box
 

Ed, thanks for the link..OK, I have read the threads and guess I need this one??

4.10 Rear Axle, 7.35x14 or F70-14 Tires, 8 tooth Drive Gear (P/N 3924098), 20 tooth Driven Gear (P/N 3860343), 3 Speed (exec O/D), HD 3 Speed, Powerglide or 4 Speed Transmission. Adapter P/N 6476736.

Did I choose wisely??

Merry CHristmas everyone

ALbert

Re: speedo reduction box
 

Albert.

Well, almost. You have a 69 Chevelle and it's a bit different on a few ratios than the Camaro! For a 4.10 rear end with F70x14 tires and a 3 or 4 speed manual transmission, you'll need the following:

3924098 8 tooth drive gear
3860342 19 tooth driven gear (neutral color)
3932220 Adapter

I didn't see your reference to the COPO Chevelle above. Sorry about that!

And by the way, GM didn't use a Stewart Warner reducer. That's an aftermarket item.

Ed

Re: speedo reduction box
 

What do you need a speedometer for anyway, to see how fast your going up the trailer ramp?? https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: speedo reduction box
 

Thanks Ed..my search begins.

and as for you Mr. Rose...just want to see what my trap speeds will be https://www.yenko.net/ubbthreads/imag...ns/naughty.gif

ALbert

Re: speedo reduction box
 

Thanks Jeff, those are the pieces that I have - so I guess I'm not missing any. I'll have to recheck it - again.

Mr.Rose - get your hiney to a SCR, you'll see why we need speedo's https://www.yenko.net/ubbthreads/imag...mlins/grin.gif

Re: speedo reduction box
 

Our Chevelle with the M20 has the straight reducer rather than the right angled one.

Re: speedo reduction box
 

Our reducer has Stewart-Warner on both ends and is original to the car unless some sneaky devil switched it. With 4:10 gears you would be winding it pretty tight to go off the end of the speedometer scale. I found the speed warning buzzer handy though. https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Re: speedo reduction box
 

And by the way, GM didn't use a Stewart Warner reducer. That's an aftermarket item.

Ed..I've never seen anything but a Stewart Warner brand used on the Ass.line for this item.Both on survivor vehicles and in the manuals.
Can you show paper or pix to contradict this?

Re: speedo reduction box
 

I have several that only have an AC logo on them with no SW wording. They are the 90 degree type.

Re: speedo reduction box
 

Only speaking of the 4:10 equipped Chevelles, the Stewart Warner gear is the only one I have ever seen on all the original cars as well. On a side note, I recently had a neighbor ask for help taking a 305 and Turbo 350 out of a 80's something Buick wagon and that also had this exact same reducer on it. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif
Rick

Re: speedo reduction box
 

"I recently had a neighbor ask for help taking a 305 and Turbo 350 out of a 80's something Buick wagon and that also had this exact same reducer on it.
Rick "


Hmmmm https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif

Re: speedo reduction box
 

Rick (Mr70),

No, I have no documentation showing only the "AC" Adapter being used. I've just always assumed (and perhaps incorrectly), that Chevrolet only used AC adapters. I've also always assumed that the conversion cars from Dana, Nickey, Yenko, etc... "May" have used an adapter other than an AC product (Stewart Warner in this case). If this is incorrect, then I appologize. The P&A doesn't show a manufacturer of any of the adapters, so in this case, the "good book" is useless!!

Ed