Ok guys here you go,
So I did some measuring, figuring and debating and this is what I did.
I'm putting a shortbox on the truck and thought why not move the diff forward and whack the back of the frame off instead of cutting and splicing it. Since I was C notchin it anyways.
So I cut the required amount off of the rear then started makin the c notch

I used some pieces of 3" x 5" x 1/4" tubing, made the notch and welded it onto the frame.

You can see in this photo where weve removed all of the spring mounts, diff etc. You can also see where I've drilled the new holes for where the mounts will be moved forward. I also moved them up an inch.

My 7 yo son Blaze decided to help out and we loaded the 9" into one of his wagons and he pulled it into the shop. My buddy Vince is seen here removing the old spring perches from the '58 Merc nine inch I'm puttin in the crew cab.

Where theres smoke theres fire and were on fire trying to get this thing done!
I've had the crew cab for just about a year now and am finally able to get on it.
With all of the measuring and figuring it'll have about a 7" rideheight at the back of the cab!
I'll get more pics up this week!
Oh and the pics were taking by my 7 year old son Blaze! pretty gooder eh!
-Shiny