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Old 02-12-2004, 09:22 PM   #1
kilomanjaro
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Frame thickness on 1/2 Ton vs. 3/4 Ton?

I just got a 1/2 ton 4x4 from randy, I got to looking at the frame and it is the same thickness as my buddies 3/4 ton 4x4(as well as all other 3/4 tons I have seen). I know that it is thicker than 1/2 ton pickups, blazers, and suburbans, are 1/2 ton 4x4 pickups thicker than other 1/2 tons. Also the rear driveshaft is about 4" in diameter like a 3/4 ton 4x4, is that normal for a 1/2 ton 4x4? I haven't checked the VIN on the frame to see if it matches the title and VIN plate. Anyhow just looking for someone's input here, I am kind of stumped, other than the possiblity of someone swapping a 3/4 ton 4x4 frame under a 1/2 ton 4x4 pickup I have no answer---thanks
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Old 02-12-2004, 10:04 PM   #2
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Thickness as in the thickness of the metal. There was a big debate here a year or so ago about that. I think the conclusion was reached that 1/2 ton and 3/4 ton frames are the same thickness. My 3/4 ton frame isnt thicker then a 1/2 ton frame.
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Old 02-12-2004, 10:08 PM   #3
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frame

Well I don't know about 1/2 ton pickups(this is the first I have ever had), but I know that 3/4 ton pickups are thicker than blazers and 1/2 ton suburbans, and the at 3/4 ton suburban frames are thicker than 1/2 ton suburban frames.
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Old 02-13-2004, 01:20 AM   #4
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My 71 3/4 ton sub frame is same thickness as my 72 1/2 ton sub-I'm pretty sure it's the same as my 71 4x4 and 681/2 tonframes as well-I'd need to double check-tommorrow!
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Old 02-13-2004, 01:22 AM   #5
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only difference on 3/4 to 1/2 frames that I found was in the trailing arms and front control arms
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Old 02-13-2004, 02:04 AM   #6
kilomanjaro
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frame

Just to be clear we are talking about the thickness of the metal used to make the frame, not an actual demension on the frame right? I was almost positive about the 1/2 ton sub being thinner.
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Old 02-16-2004, 01:43 AM   #7
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Thickness was the same.
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Old 02-16-2004, 05:39 AM   #8
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I remember looking in the data books and they gave the 3/4 ton frame the same thickness as the 1/2 ton.
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Old 02-16-2004, 08:19 PM   #9
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Those big 4" drive shaft for the rear are what are on my 1/2 ton and 3/4 ton 4x4's. Only difference in the truck or sub era I have noticed is that some early 67 and maybe some 68's had a two piece rear drive shaft also. I might have even come across a 69 with a 2 piece rear shaft if I remember right.
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Old 02-16-2004, 09:03 PM   #10
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my 3/4 ton 4x4 frame is thicker then a parts truck 70 1/2 ton 4x2 frame i have... i cut the frame horns off the parts truck so i could put a bumper on my K20 and when i put them against it it was noticably thinner
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Old 02-16-2004, 09:10 PM   #11
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i thought the frames where the same but the difference was in the suspension
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Old 02-16-2004, 09:18 PM   #12
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I've only dealt with the suburbans and in that respect,yes, the frames are identical with the exception of the suspension.
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Old 02-16-2004, 10:31 PM   #13
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I can't speak to the thickness issue, but the restoration pack from GM says there is a difference in the strength. I can't recall the specific term, it was something like sectional modulous.
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