What year is my chassis?

[joebino55]

So I recently bought a Chevy K20.  Well the cab is an 82 but the frame/chassis/drivetrain are not.  I looked up the casting number on the engine block and its a 75.  I assume the rest of the truck is similar year but I'm not 100% sure.  The rear axle is a corporate 10.5" 14 bolt and the front axle is a Dana 44 with big hubs that bolt on. Transmission is SM465 with a 205 transfer case.

Anybody know sure way to tell what year my frame is?

I guess what I am getting to is that I want to remove the aftermarket 6" lift springs that are on it and go with stock springs and need to know what year I have when looking for springs.

Thanks for any help.  I can post pictures as soon as I figure it out.

[VileZambonie]

If you think it's around a 75, look on top of the frame rail next to the steering box. Scrape it down good and read the vin #

[Engineer]

All 73~87(91) 4x4s used the same front spring mount dimensions.

Only difference is the capacity and they'll all interchange.

Choose the ones you want and order away. Don't worry about year.