My 93 CCSSB

[scotts62]

I think im going to cut it under the cab, it seems like it will be more of a pain in the arse but will look better and be easier, that way you dont have to mess with any of the leaf spring perches and just cut some off the back of the frame also. Will have to cut the rear cab mount off and the front bed mount and move them.

[JohnC]

Are these trucks different than the 73-87 trucks as far as where they get cut? The 73-87 trucks are usually just cut right behind the cab, and then just welded back up.

[wildmanaaron]

Originally Posted by scotts62

I think im going to cut it under the cab, it seems like it will be more of a pain in the arse but will look better and be easier, that way you dont have to mess with any of the leaf spring perches and just cut some off the back of the frame also. Will have to cut the rear cab mount off and the front bed mount and move them.

Is that even possible? The frame bends upward behind the cab I believe. Then it levels out from there to the end of the frame rail.

[joe231]

Originally Posted by JohnC

Are these trucks different than the 73-87 trucks as far as where they get cut?

completely

Originally Posted by wildmanaaron

Is that even possible? The frame bends upward behind the cab I believe. Then it levels out from there to the end of the frame rail.

that is what I was thinking....cutting it under the cab will just shorten where the cab sits, I dunno how you would ever get +/-12 inches out of the frame under the cab. I think you are going to have to cut behind the cab and work with the angle, graft on a short bed frame from the cab back, or extend a extra-cab short bed frame.....

but I haven't paid attention to how the long bed frames are. Could you move the front spring hangers forward and shorten the frame under the middle of the bed then just move the rear spring hangers back?

a lot of it will depend on where the bed bolts are on the short bed in relation to the long bed.

[FastEddy]

the 88+up frames are tapered in the rear behind the cab, making just moving spring hangars difficult....the 88+up 1 ton dually chassis cab (ordered without factory box) have straight frame rails, 34 inches apart, to accept aftermarket bodies, and are very easy to shorten/move spring perches around...I can take pictures of both frame configurations, as I have several of these trucks. Now if I can figure out how to post a image on here, I have a real nice GM diagram showing all measurements/configurations...will try to attatch...Nice pics and job Scott, on shortening your crewcab...I found this thread looking for info on doing my 94 GMC 1 ton Dually Crewcab 4x4, but my plan is to use a chassis cab rear frame section, along with the narrow dually diff from the chassis/cab (will tub the box inside) to have dual wheels without the big dually fenders...did this on a 87 and liked the look...now to find time to do it someday...have all the parts......also, Scott, when you moved the spring hangars forward, how much did you have to move the spring perches out on the axle? (am guessing you had to move them out because of the frame tapers wider toward the front)...