Need some trim tag code answers. On my truck, the trim tag that is located on the firewall, has various codes, B4U,ZY1, YE9. etc. I know what they mean. However there is a top line of numbers, R2109172 90 1 122473 , I know the 90 and the 1 is the production date, what are the other numbers? Thanks.

 

You might post over on ls1truck.com too...lot's of knowledge over there.

 

You can also call a dealer and they will tell you what they are.

 

Hey if I can find it I have a code book for 91 light duty pickups. I don't know if thats what you need, but when I find it I'll let you know