I have a 68 muncie 4 speed, dated P8P21, is it correct to believe that equates to Muncie 1968 Sep. 21, also right above that code is 18N32 any Idea on those numbers, also this muncie will be for sale, I will post in want adds Chuck

18N32 could be a Partial VIN for a Norwood built Camaro.

I have a 68 muncie 4 speed, dated P8P21, is it correct to believe that equates to Muncie 1968 Sep. 21, also right above that code is 18N32 any Idea on those numbers, also this muncie will be for sale, I will post in want adds Chuck

Are you sure the third digit is a "P"? Letter code for Sept. is "J", otherwise I agree with date..........

Book says p=Sept, by the numbers book, I will look again but pretty sure that is what I read

Month Code Chart


January Letter: A May Letter: E September Letter: P
February Letter: B June Letter: H October Letter: R
March Letter: C July Letter: K November Letter: S
April Letter: D August Letter: M December Letter: T

This was from an earlier post on here about muncie ID. Hope this helps, Phil.

P8P21, this trans was built Sept. 21st 1967 for use in a 1968 model Camaro... Crash

I guess the article "GM Four Speed Facts" in Aug/Sept 1995 Muscle Car Review is wrong, I copied it years ago. Below is what they claim on page 24 for late model Muncie codes.

A=January, B=February, C=March, D=April, E=May, F=June, G=July, H=August, J=September, K=October, L=November, M=December........no "P" even listed.

The "GM Four speed facts" would be correct for dating a Borg-Warner T-10, but not a Muncie... Crash

The "GM Four speed facts" would be correct for dating a Borg-Warner T-10, but not a Muncie... Crash

I agree 100 %:):)

I believe you....I checked it again and it does not say anything in the code area about BW T-10 only Muncie. They probably got it mixed up...........

Why would a P8P21 be for a 67

that's exactly what that means...p= passenger, 8= 1968, p=September and 21 is the day of the month

Here I go again.......Doesn't the first "P" indicate Muncie 4 speed?

HuH

P8P21, this trans was built Sept. 21st 1967 for use in a 1968 model Camaro... Crash

Why would it be stamped P8 if it was built in 67

Why would it be stamped P8 if it was built in 67

When cars were intoduced in late 67 for model year 68, like September, then it would be made in 67 for a 68 car.

September was the start of the new model year before things got nuts.

This is my opinion, not cast in stone.:thumbsup::thumbsup:

Here I go again.......Doesn't the first "P" indicate Muncie 4 speed?

Yes....according to this info from 5speeds.com.

"Serial numbers for Muncie 4 speeds always begin with the letter "P". P stands for Muncie Plant. Not for passenger car as some self proclaimed specialists may think. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. The letter O would add confusion since it resembles zero. The serial number is a date code the transmission was built for a particular year. Serial numbers from 1963 to 1966 included only the month and day. P0101 would indicate January 1st. From 1967 to 1968 the serial number got a year designator and a letter designator for the month such as P8A01, meaning January 1st 1968. One important point is that if you have a Muncie dated with a December build date it was actually built the prior year. An example would be the date code P8T13. This is for a 1968 production car. The T stands for December and 13 is the day. To confirm this simply look at the VIN number. It will usually begin with a 18S101350 or a 28N12950. This means the Muncie was assembled December 13, 1967 for the 1968 model year. The VIN number will usually be a low number. 1969 to 1974 Muncies got a ratio designator at the end of the serial number. An example would be P4D23B. This equates to April 23, 1974, M21 ratio."