Try looking at various underhood components, like the alt case, rad hoses, air filter case etc.
These are usually date stamped and because of 'Just in time' part arrival the date stamped is usually the date the vehicle was assembled.
Look for two or more components with the same date.....that is usually the assembly date.
If you are lucky the previous owner threw the build sheet into the glove box or owners manual.
This even has the time of day stamped as the vehicle came off the assembly line.
edit: I just spent about 10 minutes looking at labels under the hood. No luck. Appears Jeep uses a coding system beyond date coding.
Last edited by robby; 07-05-2009 at 08:19 PM.
Reason: Adding information.