Original suspension specifications

[Original]

I lifted my 1984 GMC K2500 Sierra when new. I'm unsure what size lift I put on it. How can I determine what the original factory height was from axle tubes to frame. Online search for specs are not helpful.

 

[nvrenuf]

A stock truck measures around 8.5” from the top of the front axle tube to the bottom of the frame, any difference is your approximate lift.