73-87 Chevy _ GMC Trucks > Brakes, Frame, Steering & Suspension

looking for Chassis stretch/upfitting information

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big_al273:
I'm thinking about stretching one of my 1 ton C&C frames to mount a dry van box and I'm looking for the OEM frame stretching and modifying manuals and/or procedures that would have been available to upfitters when these trucks were new.

The truck in question is a 1989 GMC R3500 C&C although I do plan to swap the cab, motor, ect to my 1986 K30 C&C chassis to save the 4x4 conversion.

big_al273:
Bump

VileZambonie:
I think the best you'll find is the wheel base specs unless someone has documented it somewhere. https://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet-Trucks/1986-Chevrolet-Truck.pdf

big_al273:
Still haven't found what I'm after but I found out the title of the GM book it should be in: Chassis Layout and Body Builder's Instruction Drawings, 1988 Light and Medium Duty models

Anyone still have one?

VileZambonie:
Did you try contacting them for archived materials? https://www.gmupfitter.com/body-builder-manuals/

Quick google search showed a bunch of those manuals floating around.

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