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Author Topic: Muncie dating.  (Read 3003 times)
Flowjoe
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« on: September 18, 2006, 12:59:49 AM »

hello, I'd like to pick your brains.  a friend emailed me a picture of a  muncie he picked up with a 660 case & a 584 tail shaft.  The assmebly date stamp shows a P0P03...that would make it a 1970 model year correct?  but a 660 case should be a '69 model year application.  And the date seems odd with the P03..any thoughts?
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RAfbody
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« Reply #1 on: September 18, 2006, 08:22:15 AM »

It looks like a very early transmission for the 1970 model year.  There should be a partial vin stamped on the transmission as well and there should be a letter stamped at the end of that date (A, B or C).

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Russ
JohnZ
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« Reply #2 on: September 18, 2006, 10:26:54 AM »

660 cases were used in '68-'69, and only 4 digits after the "P" says it's a bogus stamp for a 1970 usage; Muncies built after October, 1968 had a ratio designator as the sixth character.
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'69 Z/28
Fathom Green
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Flowjoe
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« Reply #3 on: September 18, 2006, 03:37:34 PM »

Thanks guys...It has a ratio designator....I just didn't include it as I was more interested in the "P" month code and the model year '70 on what should be a 68-69 case...there is no VIN but I went back after posting (but before reading your responses)and noticed that it has CTO stamped near the build date...John:  Would that stand for Chevrolet Transmission, as in replacement tranny?

So i solved the "P" month code...i forgot Muncie didn't follow the straight linear progression of Alpha character to Month formula..."P" = September...my error.

So now all I am still confounded by is the use of the earlier case (660) with a model year '70 build.  Perhaps replacement trannies would have something like that? 

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JohnZ
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« Reply #4 on: September 19, 2006, 12:39:29 PM »

Yup, "CT0" makes it a 5/50 warranty replacement service transmission, built in 1970.  Smiley
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'69 Z/28
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Flowjoe
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« Reply #5 on: September 19, 2006, 03:39:13 PM »

Thanks John, you're the best..i really mean that. Smiley   One follow up quesion...I know 69 produciton 660 cases did not receive a drain plug but that all 661 cases in 70 up did.  since this is a 70 built 660 would it have been normal proceedure to drill and tap for a drain plug?  thanks again


Joe
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JohnZ
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« Reply #6 on: September 20, 2006, 02:53:02 PM »

It's hard to tell what detail specs were followed at Muncie for service replacement transmissions - don't have an answer for that one.
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'69 Z/28
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Flowjoe
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« Reply #7 on: September 20, 2006, 06:37:48 PM »

thanks anyway John...this one is drilled and tapped so that picqued my interest enough to ask the question
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