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ShinerBock

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Posted: 10/13/20 02:09pm Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Krusty wrote:

Would be interesting to compare the diameter of axle tubes and the thickness of the material that they are composed of as well
Or maybe even the frames those axles are mounted on?


Todays half tons have a higher strength frame with a greater yeild strength than 3/4 ton's of just a two decades ago so I would wager that they would have a stronger frame than 3/4 from 40 years ago as well. Unless the manufacturers started increasing towing and payload ratings of 3/4 tons will decreasing frame strength over the past four decades.

I believe the AAM 9.76 axles alone that GM used on the 1500's of that year had a gress GAWR of around 6-8,000 lbs. According the GM fleet website that gives you the specs of individual components, the spring capacity on the non max trailering package is 3,850 lbs and therefore the net GAWR for that truck is 3,800 lbs. The max trailering package uses the same AAM 9.76, but has a spring capacity of 4,150, has a net GAWR of 4,150 lbs. Apparently they are limited by spring capacity and can go higher with a suspension that can handle more.

* This post was edited 10/14/20 06:51am by ShinerBock *

BenK

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Posted: 10/13/20 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

My 1980 Silverado C10 Big Ten was the HD half ton of it’s era. Big Ten meaning higher ratings than a regular half ton

It had 5 lug’s

My 1973 Chevy K5 4x4 was a shortened half ton and had 6 lug’s

Material science, manufacturing science and everything else has improved significantly

Found this chart and is about right to this discussion

https://www.oldride.com/library/1970_chevrolet_c20.html

Check out the 3/4 ton GVWR of 5,200 to 6,200 lbs, which by today’s standards is mid sized pickups to the bottom ratted full sized pickups


Chassis Data

Model Wheelbase Overall Length Front Tread Rear Tread GVW Tires
G10 90 in - - - 3,900 - 5,000 lbs 6.95 x 14 in
G20 108 in - - - 5,200 - 6,200 lbs 7.75 x 15
C10/K10 115 in 186.75 in 63.1 in 61.1 in 4,400-5,400 / 5,200-5,600 lbs G78 x 14 / G78 x 15
C10/K10 127 in 206.25 in 63.1 in 61.1 in 4,400-5,400 / 5,200-5,600 lbs H78 x 15 / G78 x 15
P10 102 in - - - 4,600 - 5,400 lbs G78 x 15
C20/K20 127 in (Longhorn 133 in) 206.25 - - 6,200-7,500 / 6,400-7,500 lbs 7 x 17.5 / 7 x 17.5 six-ply
P20 125 / 137 in - - - 6,500 - 7,500 lbs 8.75 x 16.5
C30 133 in - - - 6,600 - 14,000 lbs 8.75 x 16.5 in
P30 125 / 137 / 157 in - - - 7,300 - 14,000 lbs 8.75 x 16.5 in


Edit...

Meaning that the OEMs have/are playing mine’s bigger than yours and is a good thing for us consumers

Also, the supplier (AAM) to GM rates my 1996 GMC K2500 rear end at 10,000 GAWR, while GM rates it at 6,000 GAWR. It is also the same AAM axle assembly on the 1 ton daully of the same year and is also rated by GM at 6,000 GAWR. There are differences and that is in the MC bore size, wheel cylinder bore size and wider drum/shoes.

Ordered mine with the F60 (IIRC) option, which is the snow plow prep package, which got 1 ton front torsion bars on my 3/4 ton...and the wider drum and shoes

* This post was edited 10/13/20 02:47pm by BenK *


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

Me Again

Sunbird(Wa)/snowbird(Az)

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Posted: 10/13/20 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Here's a pic of the subject at hand.
[image]


Edit: Yes I know the rims are too narrow for the tires. Not my doing...It's gonna get some 35-12.50-20s on 20x11 steelies once she's all painted up and pretty.


We had a 76 K-20 Camper Special, with 350. Loved everything about it except the pea green color. Put a 268 cam in it advanced 4 degree. Ran good.

It was similar to this one.
[image]


2015 RAM 3500 CC SB SRW Our Rig New 2017 Bighorn 3575el. Commuter trailer 2019 Laredo 225MK. Retired and enjoying it!


jaycocamprs

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Posted: 10/13/20 06:24pm Link  |  Quote  |  Print  |  Notify Moderator

BenK wrote:

My 1980 Silverado C10 Big Ten was the HD half ton of it’s era. Big Ten meaning higher ratings than a regular half ton

It had 5 lug’s

My 1973 Chevy K5 4x4 was a shortened half ton and had 6 lug’s



The 2 wheel drive trucks of the era were 5 lug while the 4X4 trucks were 6 lug. Also some years the GMC trucks had 6 while the Chevys only had 5, unless they were 4 wheel drive


2018 Silverado 3500 DRW
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Grit dog

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Posted: 10/13/20 06:28pm Link  |  Quote  |  Print  |  Notify Moderator

blt2ski wrote:

Might need bigger axels per say, as that 5.3 in your 1500 produces more HP/torque than a BB 454 did when that K20 was produced. Hence also why the 8 lug 25/35 series trucks have 11-12" FF axles vs a 10.5FF or 9.5" SF that is on my two 2500 GM pickups with a 292 I6 in the 81, and a vortec 350 in the 2000.

Marty


That truck was originally a carbed 350. I recall those and they were NOT impressive!
It has a Stock Vortec 454 with an Edelbroke carb, headers and a traditional HEI in it. And it does ok with the 4.10s and big tires. Wouldn’t want to pull much if it had a 350 and tall gears though.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

Grit dog

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Posted: 10/13/20 06:33pm Link  |  Quote  |  Print  |  Notify Moderator

@meagain

OMG. I love that color and that truck!
Had a ‘75 that was the same color as that green truck. Briefly in high school. Drove it one winter. Except even though it was only like 13 years old it was already a steaming pile of rust....

Really wanted a 70s model but they’re less plentiful and this one doesn’t have any “old truck” issues. Plus everything works so it has some creature comforts like delay wipers AC cruise power windows

Grit dog

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Posted: 10/13/20 06:38pm Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Krusty wrote:

Would be interesting to compare the diameter of axle tubes and the thickness of the material that they are composed of as well
Or maybe even the frames those axles are mounted on?


Would be interesting to compare. Gut says the new axle is just as stout as the old one.
Frame I’m sure is stronger on a new half ton.

You guys get it. My point is the 1/2 ton trucks have gotten stronger and yet rated lower, in general.

But I would argue for the brakes on the old one, just a bit.
Of course a new HD has better braking, but those big ole drums in back do Work!
Mine still has the load sensing valve, disconnected. But when I turn it to full flow, that old ass truck stops FAST!

* This post was edited 10/13/20 07:24pm by Grit dog *

bucky

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Posted: 10/14/20 05:10am Link  |  Quote  |  Print  |  Notify Moderator

I think I know why your trailer rear bumper is dragging. Sweet truck.


2005 Cummins 3500 2WD LB quad cab dually pulling a 2014 Blue Ridge 3025RL


Cummins12V98

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Posted: 10/14/20 07:30am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Here's a pic of the subject at hand.
[image]


Edit: Yes I know the rims are too narrow for the tires. Not my doing...It's gonna get some 35-12.50-20s on 20x11 steelies once she's all painted up and pretty.


Isn't that a "C" 20? I thought the "K" was for Blazers and Suburbans?

My 86 C20 has the Semi Floater and it was the 8,600 GVW.


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ShinerBock

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Posted: 10/14/20 07:32am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:


Isn't that a "C" 20? I thought the "K" was for Blazers and Suburbans?

My 86 C20 has the Semi Floater and it was the 8,600 GVW.


C is 2wd and K is 4wd.

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