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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Feb 2010 Posts: 54 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2010 Posts: 54 | When I got my 46 chevy pick up in had 42000 miles on it. I has been setting in a shed for years and needed a lot. One thing is the tires. Can some one tell me how old they are from the serial number. I know this was covered recently but I can't make out when these tires were new.
m55ca72
m55ca38
c40ul763
They still look good but I would be afraid to try to go far on them.
Monroe McKill
| | | | | Joined: Aug 2008 Posts: 82 Shop Shark | | Shop Shark Joined: Aug 2008 Posts: 82 | I'll look and confirm, but I believe the codes are:
Four numbers - WWYY - two digits for week of the year made, and last two for year (post 2000).
or
Three numbers - WWY - where Y is the last digit of the year. These are pre-2000. I don't know how to tell of a 529 is the last week of 1999 or 1989.
1956 Chevy 3600 Dually
| | | | | Joined: Aug 2008 Posts: 82 Shop Shark | | Shop Shark Joined: Aug 2008 Posts: 82 | Just read in my notes that there is supposed to be a triangle after the three digit code to indicate decade of 1990... no triangle means decade of 1980. Hmm.
These three / four digit codes are usually in a little oval or some other formation, because these are changable casting codes and not part of the permanent casting. Hope that makes sense.
1956 Chevy 3600 Dually
| | | | | Joined: Nov 2008 Posts: 21 New Guy | | New Guy Joined: Nov 2008 Posts: 21 | DOT codes are a 10 to 12 digit number located near the letters "DOT". BTW the digits can be numbers or letters.
The first 2 digits are a code for the manufacturing plant.
The next 2 digits are a code for the tire size.
The next 3 or 4 digits are a code for the type of tire.
The last 3 or 4 digits are the date code. The format is week/week/year/year or week/week/year
Starting in the year 2000, the date coding used is 4 digits. That means the highest number you should see for the year is 08. Before 1999 the format was 3 digits. 1999 and 2000 are transition years, so you will find both 3 and 4 digits.
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