Trans speedo adapter for 69 yenko camaro

[enio45]

Need one.

I believe they were made by SW for the 69 yenko camaro's.

Looking for 1 please.

[Lynn]

While many 69 Yenko's may have had the adapter, I believe it is common on any car shipped with a Muncie and a 4:10 rear. They show up on epay from time to time.

[al8apex]

they also have a multitude of ratios ...

[enio45]

Question, so my 69 Z with a BV rear (4:10 ratio) would have this adapter as well?

I dont recall seeing it - i thought they changed the internal plastic gear for the correct speedo reading?

[John Brown]

I recall Ed Cuneen having those reducers listed in his copo book along with part numbers and ratios.

I loaned my book out and it never came back. http://www.yenko.net/ubbthreads/images/graemlins/frown.gif

[Lynn]

[ QUOTE ]
Question, so my 69 Z with a BV rear (4:10 ratio) would have this adapter as well?

I dont recall seeing it - i thought they changed the internal plastic gear for the correct speedo reading?

[/ QUOTE ]

Not necessarily. You would think that it would be uniform across the board. Can't remember the criteria for when a car got the adapter.

[resto4u]

you can buy them from speedometer repair guys. Bob's speedometer repair has a website. Roger

[al8apex]

Here is a source:

http://www.transmissioncenter.net/RatioAdapter.jpg

http://www.transmissioncenter.net/speedometer_calibration_______va.htm#gm%20ratio%20 adapter

the original stuff, sorry about the large pics:

http://mysite.verizon.net/tcherry3/pictures/auto1.jpg

or

http://www.garbee.net/~cabell/december/datcon/~hpa0000.jpg

http://www.garbee.net/~cabell/december/datcon/~hpa0001.jpg

as I stated above, they come in a LOT of different ratios ... good luck

http://www.garbee.net/~cabell/december/datcon/~hpa0002.jpg

[enio45]

Jim, excellent info - thank you for posting this.

Ill give them a call to see what they have avail.

Im still confused what triggers the use of them , especially if the 69Z's had 4:10 gears and M21 and no adapter used, vs the yenko cars had them and they run the same gears, tires and trans.

Maybe it was used if they went to TT wheels vs the standard YH wheels? Not sure if there was any diff - should not be thought???

[acelr8]

I believe the adapter to be a 90 degree not a straight through style as shown.The part number is 6476736 and heres to hoping you find two,as I need one as well.Jeff

[Lynn]

GM part number 3932220, which is a gear reduction of 1:0.75

Ring a bell for anyone? Seems like positraction had something to do with whether the adapter was used, although that really doesn't make sense.

[John Brown]

In the 69 Camaro AIM they show the reducer being used on positraction cars only.
There were three different numbers shown but I didn't write them down.
I believe the different part numbers were dependent on engine.
Should have brought the book home with me. :doh:

[Lynn]

Will have to look in the AIM tonight. In the meantime:

http://cgi.ebay.com/ebaymotors/Chevelle-...sQ5fAccessories (http://cgi.ebay.com/ebaymotors/Chevelle-SS-396-454-LS6-Speedo-Reducer-Stewart-Warner_W0QQcmdZViewItemQQhashZitem414cd37645QQitem Z280461801029QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fA ccessories)

[enio45]

I heard from another member that 2 of his L78 69 camaro's have this reducer - but his 69Z with 4:10's does not.

[enio45]

I also understand that the speedo adapter was used for hipo cars with 4:10 gears but with 14 inch tires (like copo cars and L78 cars. If you had 15 inch tires then you did not have a need for the gear reducer. Makes sense from the point that i have not seen any 69Z with 4:10 have the reducer (which they have 15in YH's).

Not sure the correct application as of yet, but maybe others can chime in. Would the parts book show a specific application?

[JIM]

I have a whole bunch of these if you need some !!!! Jim

[JJR69COPO]

If Jim or another member has a nice 3932220 speedo adapter for sale, please contact me, thanks.

[TWB]

I have one. Needs work as it appears it was dragged on the ground. Came off a real Yenko in early seventies. Sent a PM with pics.

[enio45]

This is a very old thread.........

[JJR69COPO]

Much thanks to John Brown for helping me find a 220 adapter.