Found: Muncie Stamped for 66/67 VIN 116802

[Andrew P.]

This tranny came with my 65 parts car. If it's yours, please call me at 760-518-6800 (cell). I've got it listed on the forum but would much rather see it back in the right car...

-Drew

[Wayne M.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

This tranny came with my 65 parts car. If it's yours, please call me at 760-518-6800 (cell). I've got it listed on the forum but would much rather see it back in the right car...-Drew

Drew -- couldn't see it over on CF (discussion part). Better if you posted the prefix "6S11..." or 7S11..." here, so possible owners can tell which of the two model years it belongs to. Also, the stamped assembly date would help confirm the VIN's.

[Andrew P.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne,

I'm not up on the trannies. If you tell me where to get the exact year info, I'll do it.

Thanks!

-Drew

[Wayne M.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Drew -- where you've seen the VIN 116802 (if it's from a Corvette) that stamping should have been located on the driver side maincase, on the vertical flange where it bolts to the tailhousing. But there is probably something stamped ahead of the ....116802.

Now on the opposite side (passenger) at the same spot on the rear maincase flange, will be the assembly date code. If this was from a '66 Corvette, it will probably be P0314 (or similar). If from a '67 Corvette, P7C14 (or similar). Also just confirm on the same side middle top of maincase that the first line has cast part # 3885010 ('66 & '67 Muncies only).

[Andrew P.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne,

It was in the correct spot (mine is stamped there also) and exactly as I wrote down. I'll check the other side. Any other items to check?

Maincase Casting No.: 3885010
Extension Housing Casting No.: 3857584
Sidecover Casting No.: 3884685

[Wayne M.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne,

It was in the correct spot (mine is stamped there also) and exactly as I wrote down. I'll check the other side. Any other items to check?

[FONT='Verdana','sans-serif']Maincase Casting No.: 3885010[/font]
[FONT='Verdana','sans-serif']Extension Housing Casting No.: 3857584[/font]
[FONT='Verdana','sans-serif']Sidecover Casting No.: 3884685[/font]

Those #s look good --- but still, could be either 1966 or '67. Here's a pic of the passenger side of a trans I have, showing the assembly date stamp [March 8th, 1966]. Reason we need that is to connect the timing with the VIN #. If it is far out of sync, could be a trans from another Chev assembly line. St.Louis Corvette was supposed to give the prefix 6S.. or 7S..., but all plants did not necessarily follow this rule.

[Steven S.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Wayne, based on your knowledge, what would be typical for time between trans build date stamping and vehicle assembly date?

Thanks,
Steve

[Andrew P.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne!

The Numbers are P7M08 :-) stamped on the oppposite ide of the case.

[Andrew P.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne...

Here are the pix :-)

[Steven S.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

August 8th 1967, looks like an early '68 trans.

[Wayne M.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne!

The Numbers are P7M08 :-) stamped on the oppposite ide of the case.

OK; now we're getting somewhere, thanks to the 3 additional pics you've posted. It's probably not an original Corvette unit (although physically identical to one, except for stampings).

Definitely a '66-67 type (3855010) assembled to be installed in a 1967 model year vehicle (P7mdd format -- P7M08 = 8th Aug 1966). Now, examine your pic / my flipped zoom of the VIN stamping. Ignore the 116802; this is stamped on the tailhousing, probably by some mechanic. Remember that these trannys are now 40+ years old, and many Muncie parts can be switched from other '60s - early '70s years over that span.

I've flipped the image so you can see the OTHER stamping, on the maincase, which is what is left of the VIN after some damage that has obliterated the prefix characters. Seems to be ??106809, which is a low number that corresponds to early SOP (start of production) for that model year. This is numbed too late for a '67 Corvette (ie. span between trans assembly and birthdate of a car with this VIN is too large).

So we look for other assembly plant candidates that were producing at a much higher rate than St.Louis Corvette. I have only the 1965 end-of-month production for that model year, but at least it's a guide for the early '67 production quantities. They are: Kansas City (Chevelle); (Chev passenger) at Janesville, Flint or Tarrytown. So if you're able to detect a letter to the left of the ..106809, that might nail it.

[Steven S.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

So you are saying the Muncie date stamp indicates the vehicle model year and not the actual year of assembly?

[Wayne M.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

So you are saying the Muncie date stamp indicates the vehicle model year and not the actual year of assembly?

Steve -- Yes; this change in method of assy. date stamping is mentioned in Colvin's Chev-by-the-Numbers, and also tables of Noland's vol 2, which compares lists of VIN # with corresponding trans assy. date stampings.

To answer some of your earlier questions: looking at Drew's pics of the internals, I see 2 rings on the counter gear, indicating wide ratio. The sychro assemblies are visually typical of '66-7. '63-5 are different and '68-up are MUCH different. There were many changes to the Muncie 4-sp in 1968 model year, so much that Chev wouldn't chance using up left-over 1967 model year (3855010) transmissions, from the service point-of-view.

The "M" in Drew's assembly month can be very confusing, as in "is August the end of the previous model year, or the start of the next ?". In the case of 1968 versus 1969 model years, (both 3925660 maincases) this gets tricky, and you have to compare side cover casting #s and shifter arm attachment method (stud or bolt). The best confirming info is the VIN stamp -- high numbers indicate end of model year, not start of next. Other months are easy to interpret; A, B, etc. for Jan, Feb ...

As to typical spreads between trans assy. and vehicle, there can be quite a bit of variance, depending on SOP, EOP (start, end of production), strikes, rarity (M22, close ratios with low numerical final drives, etc).

Again, Noland's lists give quite a bit of data. As examples, some of my '65s are P0829 for # 4835 (car was produced about mid-Dec, and there was a 6 week strike in between, but nevertheless, quite a gap) Another: P0916 for # 14xx (car produced Nov 6th, but would have been complete Sept 25th if there was no strike). P0415 for VIN 16524 produced 1st of May. And I have an original '66 trans from # 6S114095, assy. P0211 (which is probably within a week -- you'd have to run the VIN through a birthday calc.) There are other '65 EOP numbers indicating that even cars produced at the end of July still used 4-sp Muncies assembled June 30th.

[Steven S.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Very interesting, I did not realize that about the date stamp . With the early date I assumed early 68 production utilizing leftover 67 cases. I was curious on the date spreads because I have a January 14th case with a VIN that could equate to a Chevelle built approx. mid March, which seemed like too much time. I haven't been able to find anything on Nova or big car end of month serial numbers to compare to, it is kind of "fun" to try and determine what model it was out of.

Thanks for the information!
Steve

[Andrew P.]

Re: Found: Muncie Stamped for 66/67 VIN 116802

Hi Wayne,

I'll take a flashlight and shine it around the number adjacent to the stamped serial to see if there's any more.

Here's the context for this transmission: Came in a 65 vette w/64 replacement block, 64 intake, 64 exhaust w/67 heads, 67disti, this trans, and the rest of the running gear is (now was) correct for the 65.

...and there we are...

-Drew