Side Frame
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GMC frame
Top flange has an overhang on engine side to a 12 1/2" overall header size. Top flange has a total of 14 holes, 9drilled clearance for 5/16" bolts and 5 tapped 5/16" N.C. threads. Bottom flange has 11 holes, 6 drilledclearance for 5/16" bolts and 5 tapped 5/16" N.C. threads. One bracket at top of frame with a 7/16" diameterhole. Two sleeves welded on gussets on engine side to accommodate cross bars. Eight 5/16" N.C. threadedholes on sides of rail, 5 on engine side and 3 on grille side. Twelve 3/8" threaded holes on flat side of rail.
Note: side frames are not interchangeable.
(left side shown here.)
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GMC frames
One end is 7 1/8" wide with four 3/8" diameter holeson each side. The other end is 6 1/2" wide, also withfour 3/8" diameter holes on each side. (4 holes oneach side to accommodate more than one model) Two1/2" NC mounting studs at 37 7/8" centers. One sideof the frame has a bracket with six 5/16" NCthreaded holes. The other side of the frame also hassix 5/16" NC threaded holes plus a 5/16" NCthreaded stud in the center. Learn More