K5 frame differences by year?

[76zimmer]

After looking at the frame more on my Iron Maiden project, it appears to be a 74 dated frame, which probably went under a 75 model year K5.
Do you know if there is a difference between any model years, like body mounts, crossmembers, etc.

I think the later frames had different frame horns on them?

When I get this frame chemically stripped, I will take frame thickness measurements and add to the thread on that subject.

 

[dremu]

Major varieties are 73-77, 78-80, and 81-91.

The rear floor changed for '78, and the bumper mounts, at least, changed for '81.

-- A

 

[pauly383]

Also changed in the 80s are the mounts by the rear seats . 70's had the mounts in between the framerails on a crossmember . 80's had the l brackets with the big hole for the donut mounts on the outboard side of framerails .

Yup , the framehorns are different for the bumper brackets too .

 

[MetalMulishaMarcus]

Major varieties are 73-77, 78-80, and 81-91.

The rear floor changed for '78, and the bumper mounts, at least, changed for '81.

-- A

This is good info, just what I was looking for.