May I ask why you want to box that frame? Boxing is desirable on the flimsy '30s passenger car frames w/ big v-8s and fancy suspensions but those AD truck frames are already strong enough for a Sherman tank. Seems boxing will only cut off access to the inside of the rails.

 

To mount a MII front suspension I have to cut down into the frame to mount the shock towers. It is suggested by the Fabricator of the MII suspension Kit, Fatman Ind. that I box in the frame.
LD

 

I see. Wouldn't it be easier (and cheaper!) to just cut up some 3/16" plate? Also, I would box just enough to accommodate the MII and leave the rest open. Plenty of strength to resist any flexing and leaves the thing accessible.

 

Check these guys out, I used their parts on my coupe. Danhere

 

I see. Wouldn't it be easier (and cheaper!) to just cut up some 3/16" plate? Also, I would box just enough to accommodate the MII and leave the rest open. Plenty of strength to resist any flexing and leaves the thing accessible.

I second Willy's suggestion. This is the route I took on my '48 AD truck.

 

I used a Heidts kit which comes with the boxing plates.

This is as much as you need to box these frames for the installation of a Mustang II IFS.

 

Frame Boxing AD Chevy Pups 47-53

Thks for suggestions! Me thinks the 3/16 boxing as shown by Centerline will work just fine and should not be as much of a P inthe A as I first thought. FYI I finally did find the source for boxing kits, progressive automotive out of Ohio. They were one of the sources for who had MII type II front ends.
LD.
My todays search of the salvage yard for a rear end and rear suspension was not too helpfull for my 49 Chv PU work. I found an 80 firebird, but think 79 was the cut off for a simple conversions for a novice like me!

 

The camaro/firebird cut-off year is 81. Anything after that will be too wide. The rear axle from the 80 is a typical swap for your Advance Design truck.

 

Rear Differential 80 Firebird in 49 AD PU identity help!

The Firebird diff. is difficult for me to ID. I ck'd sites and found codes but none seem to match the numbers on the case. What I found was a large "X"
a cast in number "0240" and a nine dots around what looks like an "8". It is definitely and 8.5 from the shape. However finding a numbr like 2pt, 2po 5po like some of the ID sites say is currently a mystery.

 

The axle codes are stamped onto the axle shaft tube. You might have to hit it with a wire wheel or brush to make them stand out. Sounds like you are looking at casting numbers which won't tell you much. If you cannot find the codes on the tube you will have to pull the rear cover and find out the numbers on the pinion gear. Dividing them will provide you with your ratio.