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Author Topic: Muncie vin #'s  (Read 8181 times)
68Zproject
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« on: March 24, 2007, 01:37:50 PM »

Is there a "rule" to how the vin #'s were stamped on the 68 Muncie for the Z28?  JM's book shows one that has a 1 before the vin, I guess to denote Chevrolet?  Like 18nxxxxx and Pontiac 28nxxxxx.  I talked to a guy rebuilding my trans and he said he hardly ever sees the 1 before the vin #.  Is this 1 just on Norwood, Los, 68 Z's, certain production runs or what?  Or is it just supposed to be there and sometimes it doesn't get put on?
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68Z28
Jerry@CHP
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« Reply #1 on: March 24, 2007, 01:52:22 PM »

It's always 18N392050 on the vin stampings in '68.  I have rebuilt more than I care to talk about.

Jerry
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Mark
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« Reply #2 on: March 24, 2007, 02:01:41 PM »

It's stamped by the same machine that stamped your engine VIN.  Not only should the 1 be there, but the characters will always match the one on the engine pad.
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Mark C.
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68Zproject
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« Reply #3 on: March 24, 2007, 03:22:44 PM »

That's what I was hoping, thanks again Jerry.  It would be 18Lxxx for LOS cars though right?
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68Z28
1968RSZ28
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« Reply #4 on: March 24, 2007, 04:29:53 PM »

It would be 18Lxxx for LOS cars though right?

18Lxxxxxx for Los Angeles cars.  Also, the '68 Los Angeles built Camaros have the vin stamping on top of the transmission case.  This is where I found mine.

Paul  
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68Zproject
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« Reply #5 on: March 24, 2007, 07:04:00 PM »


 
[/quote]  Also, the '68 Los Angeles built Camaros have the vin stamping on top of the transmission case.  This is where I found mine.  
[/quote]

Is that fairly consistant?  I thought I had seen some on the side.
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68Z28
Jerry@CHP
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« Reply #6 on: March 24, 2007, 09:30:51 PM »

Yes, LA did that with any original 67-68 Muncie that I've seen.  Usually stamped at least three to four times.  On the very front part of the case, at the rear of the case, on the center bearing support, and the tailshaft lip.

Jerry
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x77-69z28
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« Reply #7 on: March 24, 2007, 11:07:59 PM »

67 doesnt have the 1 in front of it. 68 and 69 do.
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1968RSZ28
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« Reply #8 on: March 24, 2007, 11:37:39 PM »

Usually stamped at least three to four times.  On the very front part of the case, at the rear of the case, on the center bearing support, and the tailshaft lip.

Jerry

Now that's something I didn't know and will have to check!  Is it always at least three to four times?

Paul  
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Mark
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« Reply #9 on: March 25, 2007, 08:03:12 AM »

Never seen a transmission stamped more than once (except for maybe an overstrike).
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Mark C.
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« Reply #10 on: March 25, 2007, 09:22:33 AM »

I think I had a LA built 69 with it stamped probably four times on the top. Not overstrikes. Kurt probably has pics somewhere.
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red69
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« Reply #11 on: March 25, 2007, 09:51:24 AM »

Were all Muncie's stamped with VIN's? Or just Z-28s
                     Pat
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Steve68
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« Reply #12 on: March 25, 2007, 10:17:19 AM »

Pat

Other cars received Muncie's, with the associated VIN stamped on them, other than just the Z-28.

Steve
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Jonesy
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« Reply #13 on: March 25, 2007, 10:47:57 AM »

Never seen a transmission stamped more than once (except for maybe an overstrike).

My 67 Muncie from LA Plant is stamped 3 times with the VIN
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Jerry@CHP
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« Reply #14 on: March 25, 2007, 11:09:42 AM »

I think the stamping on LA Muncies depended on the mood of the plant worker.  Many LA Muncies have come in here for rebuild and resto and there is no consistancy to them at all.

Jerry 
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VI009DZ
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« Reply #15 on: March 26, 2007, 02:24:09 PM »

It wou
I think the stamping on LA Muncies depended on the mood of the plant worker.
It would be comical to find one stamped about 100 times all over the place by a pissed off, stressed out worker!!!!
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1968RSZ28
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« Reply #16 on: March 26, 2007, 11:49:46 PM »

Usually stamped at least three to four times.  On the very front part of the case, at the rear of the case, on the center bearing support, and the tailshaft lip.

Jerry

Now that's something I didn't know and will have to check!  Is it always at least three to four times?

Paul  

I got under the old Z tonight to check for multiple vin stampings on the Muncie and could only find two.  Both stampings are on top of the case, right (passenger) side, one in the front and one in the back as Jerry described.  There could be more, but with the transmission in the car and 39 years of grime, that's all I could find with my mirror.  There is also a metal tag attached to transmission side cover with the number 3915085 embossed on it.  What does this number reference?  

Paul      
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JohnZ
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« Reply #17 on: March 27, 2007, 09:07:04 AM »

 There is also a metal tag attached to transmission side cover with the number 3915085 embossed on it.  What does this number reference?  

Paul      
[/quote]

That tag is the "assembly number" for the transmission - it identifies the specific combination of main, side cover, and tailhousing castings, gearset type and ratios, input and output shafts, and output shaft speedo drive gear diameter and tooth count to suit a specific usage. Although most Muncies look the same externally, there were about a dozen different "assemblies" used, and that part number tag (and the broadcast code) identified which one they were.
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1968RSZ28
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« Reply #18 on: March 27, 2007, 11:50:38 AM »

That tag is the "assembly number" for the transmission - it identifies the specific combination of main, side cover, and tailhousing castings, gearset type and ratios, input and output shafts, and output shaft speedo drive gear diameter and tooth count to suit a specific usage. Although most Muncies look the same externally, there were about a dozen different "assemblies" used, and that part number tag (and the broadcast code) identified which one they were.

Where can I found the specific usage of this number (3915085)?  I'm curious if this number was only used for a Z/28?

Paul    



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Ed Bertrand
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« Reply #19 on: March 27, 2007, 12:18:45 PM »

Paul the 3915085 M21 Muncie 4 speed transmission had multiple usage in 68 (see the scan below).

Ed


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1968RSZ28
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« Reply #20 on: March 27, 2007, 06:55:50 PM »

Thanks Ed!  Where did you find this info?  Your P&A manual?  Also, what does "C.A.C." stand for?   Huh

Paul    
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Ed Bertrand
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« Reply #21 on: March 27, 2007, 07:21:37 PM »

Yup. The P&A.

C.A.C. stands for "Cold Air Conditioning" (as opposed to "Hot" Air Conditioning I guess!!)

Ed
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KurtS
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« Reply #22 on: March 28, 2007, 01:18:52 AM »

C.A.C. stands for "Cold Air Conditioning"
Close. Smiley
"Car Air Conditioning"
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Kurt S
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Ed Bertrand
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« Reply #23 on: March 28, 2007, 08:57:21 AM »

OOPS! You're right Kurt. I should have looked in the abbreviations section of the P&A before I spoke!!

Ed
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1968RSZ28
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« Reply #24 on: March 28, 2007, 01:09:12 PM »

Thanks guys.  C.A.C., that's a new one for me.   Roll Eyes

Paul
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Ron C.
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« Reply #25 on: March 28, 2007, 01:21:33 PM »

Never seen a transmission stamped more than once (except for maybe an overstrike).
my 71 ss chevelle m22 was stamped twice.once on the flange (side) and on the case next to the flange.
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fireZ
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« Reply #26 on: April 28, 2007, 08:19:49 AM »

My 68 LOS z28 is stamped also in 2 spots.Each has a B behind the numbers and it is a 03e car with 302  tags
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1968 Z28 LA Built
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