Okay, I measured the 79 Malibu and got a wheel base of 108-9 inches. What is it for a short wheel base 52 1/2 ton? :hmm:

Hello David,
I have been looking into this with several options for my '56.
I can't give you the dimensions for the AD Series (but I'm sure someone will chime in).
The SWB for a 56 is stock about 114" if I remember correctly. 115" actually lines up better in the wheel well. If you can get within a few inches (which it appears you have, The rear leaf chassis I have looked at can simply have the rear leaf springs ant bump stops moved forward (or back). The blazers I looked at would not work w/o extending the frame because there was not enough frame behind the rear leaf mount to move it back 5".
Is this one a coil rear?
I wonder if the coil perches could be moved back as easy as leaf mounts?
Rear frame length shouldn't be a problem with coils.
Then of course theres the altered drive shaft to fit regardless what you choose to do.

Cheers

Wheel base on a 52 1/2 is 116".