66 K20 Frame Tail Length

[Joe P]

My 66 K20 eight foot bed Fleetside is missing the tail ends of the frame rails, and I will need to extend to the correct length in order to properly mount the bed. How long should they be? Photos show the right rear rail as it sits. Measurements were taken from the back of the cross piece.

[72cs20]

Right behind your rear spring frame bracket there is a small hole in the side of the frame rail. On my 66 K20 it is 11 1/4 inches from the middle of that hole to the end of the frame.

[Joe P]

Originally Posted by 72cs20

Right behind your rear spring frame bracket there is a small hole in the side of the frame rail. On my 66 K20 it is 11 1/4 inches from the middle of that hole to the end of the frame.

Thank you, I appreciate your time and the information very much. This is helpful.

[LostMy65]

Some of these might help:
http://67-72chevytrucks.com/vboard/s...d.php?t=325736

[Joe P]

Originally Posted by LostMy65

Some of these might help:
http://67-72chevytrucks.com/vboard/s...d.php?t=325736

Thank you! Appreciate the references!

[MT65]

Took these today , 65 k-20…….at least these are close, just finishing a c-10, the rear xmember was 5/8 out of square, all the rest good…go figure…

[LostMy65]

Originally Posted by MT65

Took these today , 65 k-20…….at least these are close, just finishing a c-10, the rear xmember was 5/8 out of square, all the rest good…go figure…

What do you mean the rear cross member was out of square by 5/8 of an inch? There is a rear cross member that is supposed to be out of square with the frame.

[MT65]

Originally Posted by LostMy65

What do you mean the rear cross member was out of square by 5/8 of an inch? There is a rear cross member that is supposed to be out of square with the frame.

Maybe you could school me on why that would be….

[Joe P]

Originally Posted by MT65

Took these today , 65 k-20…….at least these are close, just finishing a c-10, the rear xmember was 5/8 out of square, all the rest good…go figure…

Thank you for the photos very much. They are very helpful. Thankfully, my truck is square even though it had a hard life and was really rusty. I replaced the rear cross rail (with the help of another member on this list who made parts for me) because it was so thin. Thank you again!

[LostMy65]

Found it - You'll see it the same on many leaf spring trucks of our generation.
Here is a post:

Originally Posted by Shane

triangulation is correct ... if you will notice, it's angle runs opposite the angle of the Panhard bar.

.
Here is a pic:

[MT65]

Originally Posted by LostMy65

Found it.
Here is a post:

.
Here is a pic:

The one on mine was not that one , but the extreme rear one.
I measured for a fuel tank, of course I measured the long side, built the tank, proceeded to attempt to install…..drilled out the rivets and moved it back an inch and square….