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03-13-2011, 02:29 PM
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#1 |
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Registered User
 
Join Date: Jan 2009
Location: highspire,pa
Posts: 423
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our truck frames
How thick are our truck frames?...3/16 or thicker 3/4 and 1/2 ton's are the same.
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'72 chevy k20 '06 H-D Springer softail http://www.bluemooncruisers.com/ http://www.enginecycle.com/ ~Eric 
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03-13-2011, 03:09 PM
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#2 |
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Senior Member
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
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Re: our truck frames
not sure how thick they are. The 1/2 ton 3/4 ton and 1 ton are different frames. If im not mistaken the 3/4 ton are thicker with more braces on them than the 1/2 and the 1 ton is thicker than the 3/4 ton with a larger frame. Im sure somebody else will chime in and correct me if im not right on something.
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1969 Chevy c20(Miss Hackjob) |
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03-13-2011, 03:14 PM
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#3 |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: our truck frames
I don't think it's anywhere near that thick....My '69 Truck Data Book said the side rails are .151 inches thick.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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03-13-2011, 04:13 PM
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#4 |
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Old School
Join Date: Jan 2010
Location: Dover,AR
Posts: 185
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Re: our truck frames
I read somewhere on here that 3/4 ton frames are .050 thicker than 1/2 ton's.
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#1 Project...69 Chevy swb Fleetside (Dad's truck) #2...1983 El Camino SS (Choo Choo Custom) #3...1974 Datsun truck (4.3L V6/4L60E) #4...1951 Cadillac Limo (1975 Caddy running gear) #5...1938 Dodge M38 3/4 ton Military truck #6...1968 Sportster XLCH trail bike 5 GMC & Chevy parts trucks 68 to 72 Last but not least; My 1978 Harley Davidson Electraglide (trusted & reliable companion for the last 30 years) |
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03-13-2011, 04:58 PM
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#5 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: our truck frames
My longhorn(clean So-Cal frame), mikes out @.190(3/16). this is a 1ton frame, but I beleive the 3/4 frames are also in that same 3/16 range. crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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03-13-2011, 05:07 PM
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#6 |
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Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 740
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Re: our truck frames
I thought 1/2 and 3/4 ton frames were the same.
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03-13-2011, 05:47 PM
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#7 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: our truck frames
According to the 1969 "Truck Data Book" ; " C-10...Frame: 39,000-Lb.-test steel.Section modulus 2.98".
C-20.. Frame: "All models except Longhorn: Section modulus 3.71. Longhorn:Section modulus 5.05. Now if I just knew what a "section modulus" was.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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03-13-2011, 06:05 PM
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#8 |
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Registered User
Join Date: Feb 2011
Location: Puyallup, WA
Posts: 11
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Re: our truck frames
1/2 1972 frame rails, checked 4 or 5 places. .155 to .158 Hope that helps.
Kevin Last edited by kac383; 03-13-2011 at 06:05 PM. |
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03-13-2011, 06:20 PM
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#9 | |
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Old School
Join Date: Jan 2010
Location: Dover,AR
Posts: 185
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Re: our truck frames
Quote:
(""In structural engineering, the section modulus of a beam is the ratio of a cross section's second moment of area to the distance of the extreme compressive fibre from the neutral axis. The section modulus is directly related to the strength of a corresponding beam. It is expressed in units of volume, e.g.m3, mm3."") I googled this because I wanted to know. Guess what? I still don't know.
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#1 Project...69 Chevy swb Fleetside (Dad's truck) #2...1983 El Camino SS (Choo Choo Custom) #3...1974 Datsun truck (4.3L V6/4L60E) #4...1951 Cadillac Limo (1975 Caddy running gear) #5...1938 Dodge M38 3/4 ton Military truck #6...1968 Sportster XLCH trail bike 5 GMC & Chevy parts trucks 68 to 72 Last but not least; My 1978 Harley Davidson Electraglide (trusted & reliable companion for the last 30 years) |
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03-13-2011, 08:15 PM
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#10 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: our truck frames
The strenght of that old Longhorn(1 ton frame), dont come in the thickness of the rails.....but in the height of the rails
 crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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03-13-2011, 08:48 PM
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#11 | |
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Restoring it $200 at a time...
Join Date: Aug 2008
Location: NE Kansas
Posts: 886
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Re: our truck frames
Quote:
It's based on the geometry of a beam and describes how easily the beam deflects when loaded. The depth of the beam, more than the web thickness or width, is what drives the modulus. In sizes around our truck's frames, a 6" channel is about 8 times as 'stiff' as a 3" channel.
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Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society '68 5.3L-4 speed LWB C20; grandpa bought it for the farm in '71. Now LS 5.3, rather than 327. DD '09 Pilot Weekender '65 Skylark 300-4V-4 speed Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine. Son's '04 F250 SuperCab 6.0 Last edited by hounddogs!; 03-13-2011 at 08:49 PM. |
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03-13-2011, 09:31 PM
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#12 | |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: our truck frames
Quote:
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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