Frame thickness
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Freshman User
Joined: Feb 2010
Posts: 44
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From: Bloomfield, NY
Frame thickness
Hi, I just picked up a 79 f250 4x4 that has some extensive rust on it from being a plow truck. I am getting about .19 inches of frame thickness in good areas but is gets as thin a .14 inches. Is this within tolerances? I am also planning on swapping out the bodies with a 79 f150 2 wheel drive I have for parts. How many floor supports are supposed to be on the bottom of the truck cab? Thanks in advance.
Lead Driver
Joined: May 2007
Posts: 6,993
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From: Costa Mesa, CA
I've never looked that closely at the frame and have only held up a machinist's rule once and eyeballed it at .2" to .25" which was close enough for what I was doing at the time.
As for the "floor supports" - do you mean actual ribs under the floor of the cab or the body mounts that the cab sits on that attach to the frame. The latter is 4 (and 2 under the grill/core support) if that is the one you are after.
As for the "floor supports" - do you mean actual ribs under the floor of the cab or the body mounts that the cab sits on that attach to the frame. The latter is 4 (and 2 under the grill/core support) if that is the one you are after.
Senior User
Joined: Jun 2008
Posts: 106
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From: Los Angeles, CA
Here are some frame thicknesses that I've collected over the years, with the GVWR and type of truck:
‘79 F-150 2wd 0.160 (6150) regular cab<O
</O
‘78 Bronco 4wd 0.185 (6400)<O</O
‘74 F-250 2wd 0.204 (6200) regular cab<O</O
‘79 F-250 4wd 0.204 (6700, 8100) regular cab<O</O
‘75 F-250 4wd 0.212 (7100) regular cab<O</O
‘76 F-250 2wd 0.249 (7800) crew cab, short bed<O</O
‘79 F-250 4wd 0.249 (7100) supercab<O</O
‘79 F-350 2wd 0.249 (9100, 10000) crew cab, long bed<O</O
‘79 F-350 2wd 0.249 (10000) 161wb “chassis cab”<O</O
’79 F-350 2wd 0.225 (9200) supercab<O</O
’79 F-350 4wd 0.249 (8600) supercab<O</O
’78 F-350 2wd 0.225 (9900) "super" camper special<O</O
‘79 F-150 2wd 0.160 (6150) regular cab<O
</O‘78 Bronco 4wd 0.185 (6400)<O
</O‘74 F-250 2wd 0.204 (6200) regular cab<O
</O‘79 F-250 4wd 0.204 (6700, 8100) regular cab<O
</O‘75 F-250 4wd 0.212 (7100) regular cab<O
</O‘76 F-250 2wd 0.249 (7800) crew cab, short bed<O
</O‘79 F-250 4wd 0.249 (7100) supercab<O
</O‘79 F-350 2wd 0.249 (9100, 10000) crew cab, long bed<O
</O‘79 F-350 2wd 0.249 (10000) 161wb “chassis cab”<O
</O’79 F-350 2wd 0.225 (9200) supercab<O
</O’79 F-350 4wd 0.249 (8600) supercab<O
</O’78 F-350 2wd 0.225 (9900) "super" camper special<O
</O
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