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Author Topic: 69 Muncie Transmission tag (pn?)  (Read 21183 times)

69Z28-RS

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69 Muncie Transmission tag (pn?)
« on: January 08, 2014, 04:32:21 AM »
The following tag is on the Muncie transmission (M20) in my '69 Z.. which I believe to be totally original.  can someone confirm this is correct for a '69 Muncie M20?  I think the PN reads:   3946797...
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6667ss138

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Re: 69 Muncie Transmission tag (pn?)
« Reply #1 on: January 08, 2014, 05:20:45 AM »
Yes, that is the correct M20 tag
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1968RSZ28

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Re: 69 Muncie Transmission tag (pn?)
« Reply #2 on: January 08, 2014, 06:36:18 AM »
Gary,

Isn't the partial VIN stamped on the case?

Paul
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69Z28-RS

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Re: 69 Muncie Transmission tag (pn?)
« Reply #3 on: January 08, 2014, 05:48:40 PM »
Paul,

Yes, the VIN is stamped along with the application code and the transmission is original, but I didn't know about the tag itself (although most of these were tossed away and back in the '70's when I bought this car, no one would have put one on that didn't belong.  I believe this transmission has never had the side cover off....  car has 75K or so miles (thru 1980..  not driven since).
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09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

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Re: 69 Muncie Transmission tag (pn?)
« Reply #4 on: January 23, 2014, 02:43:02 AM »
Gary, what ratio rear axle do you have?  The normal 3.73?  That part number was used for 3.55, 3.73 and I think 4.10 in 1969.
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69Z28-RS

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Re: 69 Muncie Transmission tag (pn?)
« Reply #5 on: January 23, 2014, 02:43:42 AM »
Yes, rear is a BU (3.73:1 ratio)...
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69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

69Z28-RS

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Re: 69 Muncie Transmission tag (pn?)
« Reply #6 on: May 08, 2014, 12:53:42 PM »
There's a 'Muncie transmission tag' for sale on ebay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=161298278028&ssPageName=ADME:B:SS:US:1123

This one is identified as  "1969 Chevelle, Corvette, Camaro Muncie M20 Factory Original Trans Tag 3950356".   This is  different number than on my original M20 Muncie.

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)
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09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

jdv69z

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Re: 69 Muncie Transmission tag (pn?)
« Reply #7 on: May 08, 2014, 01:38:05 PM »
Here's my M20 Tag
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Jimmy V.

jdv69z

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Re: 69 Muncie Transmission tag (pn?)
« Reply #8 on: May 08, 2014, 01:41:39 PM »
Quote from: 69Z28-RS on May 08, 2014, 12:53:42 PM

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)

Because each different rear end ratio required a different plastic (I think) gear to make the speedometer read correctly.
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Jimmy V.

69Z28-RS

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Re: 69 Muncie Transmission tag (pn?)
« Reply #9 on: May 08, 2014, 02:02:19 PM »
Thanks!!   :)    That makes sense..    !   :)
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69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

JohnZ

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Re: 69 Muncie Transmission tag (pn?)
« Reply #10 on: May 08, 2014, 04:36:58 PM »
Quote from: jdv69z on May 08, 2014, 01:41:39 PM
Quote from: 69Z28-RS on May 08, 2014, 12:53:42 PM

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)

Because each different rear end ratio required a different plastic (I think) gear to make the speedometer read correctly.

Actually, the plastic DRIVEN gear was installed at the car assembly plant. What changed was the internal steel DRIVE gear that was pressed on the output shaft at Muncie; there were two different diameter steel DRIVE gears that only worked with two different "families" (diameters) of plastic DRIVEN gears, depending on the axle ratio, and the transmission assembly part number on the steel tag was the only way Muncie or the car assembly plant could tell which transmission they had.
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jdv69z

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Re: 69 Muncie Transmission tag (pn?)
« Reply #11 on: May 08, 2014, 06:48:50 PM »
So there were 2 diff parts no.s for each of the 3 trans - M20, M21, and M22?
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Jimmy V.

ko-lek-tor

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Re: 69 Muncie Transmission tag (pn?)
« Reply #12 on: May 08, 2014, 07:17:32 PM »
All covered in the AIM- M20-A1 I had asked about this sometime back about the difference in the part numbers for different RPO's. M20 was either 3950356 or 3946797 for 1969 depending on RPO and Gear ratio. Might as well put other #'s while I am looking at page-M21= 3950316 or 3946798, M22-3950318
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69Z28-RS

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Re: 69 Muncie Transmission tag (pn?)
« Reply #13 on: May 08, 2014, 07:19:51 PM »
Quote from: JohnZ on May 08, 2014, 04:36:58 PM
Quote from: jdv69z on May 08, 2014, 01:41:39 PM
Quote from: 69Z28-RS on May 08, 2014, 12:53:42 PM

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)

Because each different rear end ratio required a different plastic (I think) gear to make the speedometer read correctly.

Actually, the plastic DRIVEN gear was installed at the car assembly plant. What changed was the internal steel DRIVE gear that was pressed on the output shaft at Muncie; there were two different diameter steel DRIVE gears that only worked with two different "families" (diameters) of plastic DRIVEN gears, depending on the axle ratio, and the transmission assembly part number on the steel tag was the only way Muncie or the car assembly plant could tell which transmission they had.

Thanks JohnZ... :)    you came thru with factual 'new information' for the day ..  AGAIN..  :)

*(and Bentley).*  You posted while I was typing.. :)
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09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

jdv69z

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Re: 69 Muncie Transmission tag (pn?)
« Reply #14 on: May 08, 2014, 07:53:47 PM »
So I'm assuming the M22 was only available over a narrow range of rear end ratios, thus only needing 1 part no.?
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Jimmy V.
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