need axle and option codes for 81p/u

[clyde]

Hello fellow chevy people. I am in the process of doing the power steering/ disc brake swap on my daily driver 66 fleetside. I have an 81 donor truck that came with the factory sticker indicating option codes and have not been able to find a place to download an explanation of them. I am particulary interested in finding out 1. What is a standard rear axle(1GQ1), 2. What is a "special ecomony truck"? (1Z07) (it looks like it has small headers, and has a two barrel). The engine is a 250. If anyone out there has used the hollow shaft steering shaft instead of cutting and reusing the solid in the 60-66's when doing the power steering swap I would like to hear from you. I am also interested in finding someone who has put a 68 camaro tilt column into their 81. Thanks in advance.