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Old 04-20-2007, 11:38 AM
CrashFarmer2's Avatar
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What are the differences between a 3/4 and 1 ton Chevy?

I have a 1978 Chevy C20. It sits about 4 inches taller than My 1974 C20 and it rides a lot rougher. It sits so tall that some people have mistaken it for a 4X4. It can haul a big load of wood without very much sag at all. I know it has been wrecked and rebuilt at some point in time. I am wondering if someone put the cab on a one ton frame. What are the differences between a 3/4 and 1 ton Chevy?

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Old 04-20-2007, 11:52 AM
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I do believe that those 78's were available with a factory heavy duty spring option and you got one..Your other one probably has the regular duty springs on it..Just my guess but if you can find the build sheet which may be under the seat I think you can learn some more..

I have tried most all of it and now do what is known to work..
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Old 04-20-2007, 03:37 PM
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what does the RPO code sticker say as far as springs and axle and such

ive owned a million of these trucks i love them and miss them now i had a 74 i should have kept, otherwise all the oens i have had were 72 and older or 76 and up, the 73-75 are the hardest to find for some reason, theres a couple lime green ones floating around town here i know of, otherwise virtually none now

what do you plan on doing with yours

id love to find one of these 3/4 tons again to work with, i hate seeing ppl junking them just because they are not a 1/2 ton

what a waste, these were some really heavy good work trucks will pull anything

hope you have good plans for it

1 ton frame is taller under the cab and front of the bed than a 1/2 and 3/4 ton

also the 1 ton have 40" spring pad spacing in the rear

42.5" under 1/2 and 3/4 ton

thats how to tell/know

some c20 sat up pretty high, due to the HD suspensions ordered

very common in the day

F41 was HD suspension/chassis
C6P was HD suspension
and G50 and G60 were HD front and rear springs

common stuff

anyon who thinks its a 4x4 by glance obviously knows nothin about trucks nor 4x4, since its obvious it has no front solid axle under it or a t/c lol

good luck

Last edited by fast68; 04-20-2007 at 03:43 PM.
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Old 04-20-2007, 06:18 PM
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My Comparison is from what I have
1985 Chevy Silverado 20 3/4 ton Suburban & a 1988 Silverado 30 Dualie.

some of the things I noticed that were heavier on the dualie are as follows

~The frame after the front suspension gets wider the 3/4 is 6 " & the dualie is 8" wide but both seem to be about .025" thick

~The Dualie has heavier bolts everything seems to be grade 8

~The dualie stuff... tie rods ,sway bars ,springs & brakes are substantially bigger as well as the master cylinder is too.

~The 3/4 ton has a 14 bolt Full floater rear & 13" drums while the dualie has a Dana 70 with 13" drums but the shoes are much wider {i don't remember the measurements}

But one thing I noticed was that the Burb has 245 -70/R 16 load range "E" & the Dualie has 235 - 85/R 16 load range "E" they seem to sit at the same hight in the front.

Well that is all I can think of for now .
Does that help some?

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