FILENAMES:

Frame_Extension01.jpg
Frame_Extension02.jpg 
Frame_Extension03.jpg
Frame_Extension04.jpg
Frame_Extension05.jpg

DESCRIPTION:

These are pictures of a modification to a tractor-trailer
truck frame.

Posted by Wayne Cook <waynec@pan-tex.net>. 

The following description was provided:

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  These are some pics of the frame extension I'm
doing to a semi tractor. When through this will
become a big wrecker. I'll be adding pics as I
go along.

  As you can see I'm adding about 4 1/2 ft to the
frame. In pics 1-5 I've just got through adding
the extensions (though I've still got to grind the
welds on the passenger side rail). I'll be adding a
insert in the inside of the frame running from the
back to about the rear spring hanger of the front
axle. The extensions are just A36 I've had broke to
match the existing frame. The original frame is 5/16"
thick which I matched on the extensions though the 
frame is definitely a higher carbon content than the
extensions. The insert is also bent from 5/16" A36
and it's broke to just slip inside the frame. I had
to add 5' to the end of the insert to get it long
enough since I couldn't get more than 20' broke at
one time. I'll be putting the welded end of the 
insert in the front under the cab. I'll also be
adding a piece of 1/2" x 9" HR strap inside the
insert in the rear which will go from the back to
just in front of the front driver spring mounts.
It's to reinforce that section for the underlift
that will be placed in the rear of the truck.