C3 transmission codes
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
Likes: 0
C3 transmission codes
I have recently purchased somewhat of a barn find. 1969 numbers matching 427 4speed with factory air . It's a 390 hp . I'm trying to decode the transmission. It is P9A04A. Not sure why the A is at the end of sequence. Thought would be after the P. Any input ?
Racer
Joined: Jul 2008
Posts: 301
Likes: 5
From: Youngstown NY
Trans
A = M20
B = M21
C = M23
Jan. 4 1969 build date.
Last edited by Zoix; Nov 3, 2016 at 10:13 PM.
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
Likes: 0
Thanks so much ! Next on the agenda is the rear end . Thought I would get lucky and find the tank sticker but tank has been replaced . Older lady in Raleigh has had the car since October of 78 but she didnt have any documentation.
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
Just take a pic of the bottom of the rear end. It'll be stamped with all the information you need to de-code it. (A lot of times the M-20 was paired up with 3.36 gears.)
Thread Starter
5th Gear
Joined: Nov 2016
Posts: 5
Likes: 0
Heres one of the pics after i did a little polishing and took off the aftermarket sidepipes. Added new tires . Bought from an older lady near Raleigh that had owned the car since October of 1978. She had the interior redone and 1 repaint nearly 10 years ago . Car has been in her cousins garage for the last several years and not been driven as she was unable to get in and out of it . I was not expecting the paint to be anywhere close to this but was pleasantly surprised! Not sure its a true (barnfind) but it was pretty neat to find one in this shape that had been put back fir a few years
Last edited by NCniner; Nov 7, 2016 at 07:41 AM. Reason: More detailed description
Team Owner
Joined: Sep 2006
Posts: 31,280
Likes: 4,372
From: Westminster Maryland
Hi NC,
Well that's quite a nice looking 69 coupe!
It appears it was pretty carefully stored in a pretty nice barn!
I hope it turns out to be a special as it looks!
Regards,
Alan
If you haven't had a chance to look at at the rear differential stamps here's an example from a 71.
For 71 the ratio code returned to 2 letters. LR….3.36:1P
The Julian date is 12, thus a differential assembled during the second the week of January 1971 for a mid-January built car.
Plant: W….Warren
Source: E….Eaton
Shift: 1
Well that's quite a nice looking 69 coupe!
It appears it was pretty carefully stored in a pretty nice barn!
I hope it turns out to be a special as it looks!
Regards,
Alan
If you haven't had a chance to look at at the rear differential stamps here's an example from a 71.
For 71 the ratio code returned to 2 letters. LR….3.36:1P
The Julian date is 12, thus a differential assembled during the second the week of January 1971 for a mid-January built car.
Plant: W….Warren
Source: E….Eaton
Shift: 1
Last edited by Alan 71; Nov 7, 2016 at 07:36 AM.
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Safety Car
Joined: May 2008
Posts: 3,753
Likes: 721
From: Lafayette Louisiana
Beautiful!
Heres one of the pics after i did a little polishing and took off the aftermarket sidepipes. Added new tires . Bought from an older lady near Raleigh that had owned the car since October of 1978. She had the interior redone and 1 repaint nearly 10 years ago . Car has been in her cousins garage for the last several years and not been driven as she was unable to get in and out of it . I was not expecting the paint to be anywhere close to this but was pleasantly surprised! Not sure its a true (barnfind) but it was pretty neat to find one in this shape that had been put back fir a few years
Beautiful Corvette! Congratulations on a great find!
