Build code - Team Camaro Tech
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post #1 of 12 (permalink) Old Dec 17th, 00, 01:55 PM Thread Starter
 
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I have a 69 RS/Z28, it's an early car #8815 from Norwood,OHIO. I have the POP, the cowl tag states the car started down the assembly line on 09B, Sept, second week of 1968. The identification # for the engine is V0905DZ, where I have a problem is with the id #s for the transmission and the rear end which are P9M16 (Muncie, built 69, Sep 16) and BU0919G-E ( 3.73:1 ratio, built Sept 19th by Detroit Gear & Axle) respectively. Should the transmission and rear axle have been built before the build code on the cowl tag? The "White Book" states that the build code on the cowl tag was the date the car started down the assembly line and not when it was built, so I think the protect-o-plate is correct if this the case. Has anyone else encountered this?
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post #2 of 12 (permalink) Old Dec 17th, 00, 06:46 PM
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Those #'s look right on for that build date. It's a late 09B car and other cars in the same build period have engine components dated very similarly.

Could you also post the other #'s from the cowl tag? M20, M21, or M22?

Thanks!

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post #3 of 12 (permalink) Old Dec 17th, 00, 07:44 PM Thread Starter
 
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The cowl tag on the early 1969 cars did not have trim codes like the later 1969 camaros.
There is no letter designation on the casing of the transmission to determine the transmission. I assume it is a M21. My cowl tag gives me the color 79 - 79, 711 standard interior, build code 09B, the year and body sequence number. I understand that cars built after Oct. 21, 1968 had their transmissions casings stamped A for M20, B for M21, and C for M22 after the trans id #. The way the car responds when shifting also indicates that it is the M21 (close ratio). It does not sound like the rock crusher M22.
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post #4 of 12 (permalink) Old Dec 17th, 00, 07:55 PM Thread Starter
 
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Correction in the trans id # P9M16, the M is actually August not September as per Jason Scott's "Camaro Restoration Guide".
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post #5 of 12 (permalink) Old Dec 18th, 00, 06:53 PM
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Thanks! The trim codes were the #'s I was looking for. Rallye Green. One word - bright!
I'd also be interested in the NOR # if you could post it too.

Thanks!

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post #6 of 12 (permalink) Old Dec 19th, 00, 01:11 PM Thread Starter
 
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Kurt, The body # is 12437NOR103825
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post #7 of 12 (permalink) Old Dec 20th, 00, 07:51 AM
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Thanks for the info!

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post #8 of 12 (permalink) Old Dec 21st, 00, 08:15 AM
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BTW, it is very difficult to determine close ratio vs wide ratio with shifting. The gear spacing is the same between 1-2 and 2-3. Only 3-4 has wider spacing on the M20 vs M21/2.

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post #9 of 12 (permalink) Old Dec 21st, 00, 12:29 PM Thread Starter
 
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Kurt, Is there anything on the transmission casing that would tell me its type M20-M21/2?
Remember I have an early transmission.
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post #10 of 12 (permalink) Old Dec 21st, 00, 01:55 PM Thread Starter
 
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I just checked my tranny case, it does have a drain plug, does that mean it's a M22, I don't know. I read that early M21 trannys had drain plugs.
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post #11 of 12 (permalink) Old Dec 21st, 00, 02:44 PM
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All 3925661 castings (1970-74 production) had drain plugs, regardless of type (20/21/22). With the earlier 3925660 (1968-70) and 3885010 (1965-67) castings, only M-22's had drain plugs when new (although many were drilled and tapped during rebuilds for convenience in draining lube, or to flim-flam people into thinking they were buying a real M-22 at the time). Only Muncies built from 1969-1974 had a ratio/type designator as the last character in the source code stamping (M20 - "A", M-21 "B", M-22 "C"). Knowing the number of times most old Muncies have been rebuilt and the fact that there is such wide interchangeability of internal parts from year to year, the only way to tell if you have an M-22 is to remove the side cover and look at the gear teeth; M-20 and M-21 gears have a 45-degree helix angle, and the M-22 gears have a 20-degree helix angle.

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[This message has been edited by JohnZ (edited 12-21-2000).]
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post #12 of 12 (permalink) Old Dec 21st, 00, 05:09 PM Thread Starter
 
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Thanks, John
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