Frame question 1/2 ton vs 3/4 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68GMC2500 · 11-25-2020, 09:21 PM

I have a 1/2 ton long bed 4x4 and I was wondering if it's worth it to you upgrade to a 3/4 ton frame I have 3/4 ton axles and springs. Going to be doing some towing. Any thoughts or advice thanks
Joe

Ziegelsteinfaust · 11-25-2020, 09:34 PM

I think the frames are the same on the 4x4 1/2 + 3/4 tons.

As far as towing it depends on where you draw the line. If its a ocasional 7000 pounds i don't see it worth the effort. If it is alot of towing, and closer to 9000 pounds then a 3/4 ton will be the ideal choice.

LostMy65 · 11-25-2020, 09:42 PM

The frames are the same.
What are the 3/4 ton differentials you have out of?

**Captainfab** · 11-25-2020, 11:17 PM

I've never had a K20 but the C10 and C20 frames are not the same. The C20 is stamped from heavier gauge steel and has extra bracing.

LostMy65 · 11-26-2020, 12:19 AM

Quote:

Originally Posted by Captainfab

I've never had a K20 but the C10 and C20 frames are not the same. The C20 is stamped from heavier gauge steel and has extra bracing.

Sorry Captain,
I guess I was repeating what I heard without knowing for sure myself.
Thank you.

68GMC2500 · 11-26-2020, 07:46 AM

Thanks y'all
Will be towing about 7000lb

LostMy65 · 02-19-2021, 09:57 PM

Found this in another thread:

½ ton 2WD: 6-1/32 x 2-1/2 x 5/32

¾ ton 2WD: 6-1/8 x 2-17/32 x 3/16

One ton 2WD: 8-1/8 x 2-13/16 x 3/16

½ ton 4WD 115” WB: 8-1/32 x 2-25/32 x 9/64

½ ton 4WD 127” WB: 8-1/8 x 2-13/16 x 3/16

¾ ton 4WD: 8-1/8 x 2-13/16 x 3/16

As you can see, even the ½ ton 4WD long bed uses the same size frame member
as the one ton 2WD.

1960-62 frame ,measurements

½ ton 2WD: 5-15/32 x 2-1/4 x 1/8
¾ ton 2WD: 7-3/16 x 2-3/4 x 3/16
½ and ¾ ton 4WD: 7-13/64 x 2-3/4 x 3/16

LostMy65 · 02-26-2021, 08:09 PM

Could someone please verify that the frame for the 4x4's are actually 8 inches tall?

66x3 · 02-26-2021, 10:09 PM

I can check tomorrow ,66 K 20 4x4 and let you know.

66x3 · 02-27-2021, 02:00 PM

Confirmation: My 66 K 20 frame is somewhere between 8-8.25 measured from about the center under the cab. Didn't want to roll around in the snow to check further!

LostMy65 · 02-27-2021, 11:19 PM

Thanks.
I wonder if they made the frame taller because a 4x4 may need to resist more twisting.

11-25-2020, 09:21 PM	#1
68GMC2500 Registered User Join Date: Apr 2018 Location: Ca, South San Francisco Posts: 25	Frame question 1/2 ton vs 3/4 ton I have a 1/2 ton long bed 4x4 and I was wondering if it's worth it to you upgrade to a 3/4 ton frame I have 3/4 ton axles and springs. Going to be doing some towing. Any thoughts or advice thanks Joe

11-25-2020, 09:34 PM	#2
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,628	Re: Frame question 1/2 ton vs 3/4 ton I think the frames are the same on the 4x4 1/2 + 3/4 tons. As far as towing it depends on where you draw the line. If its a ocasional 7000 pounds i don't see it worth the effort. If it is alot of towing, and closer to 9000 pounds then a 3/4 ton will be the ideal choice.

11-25-2020, 09:42 PM	#3
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Frame question 1/2 ton vs 3/4 ton The frames are the same. What are the 3/4 ton differentials you have out of? __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

11-25-2020, 11:17 PM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Frame question 1/2 ton vs 3/4 ton I've never had a K20 but the C10 and C20 frames are not the same. The C20 is stamped from heavier gauge steel and has extra bracing. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

11-26-2020, 07:46 AM	#6
68GMC2500 Registered User Join Date: Apr 2018 Location: Ca, South San Francisco Posts: 25	Re: Frame question 1/2 ton vs 3/4 ton Thanks y'all Will be towing about 7000lb

02-19-2021, 09:57 PM	#7
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Frame question 1/2 ton vs 3/4 ton Found this in another thread: ½ ton 2WD: 6-1/32 x 2-1/2 x 5/32 ¾ ton 2WD: 6-1/8 x 2-17/32 x 3/16 One ton 2WD: 8-1/8 x 2-13/16 x 3/16 ½ ton 4WD 115” WB: 8-1/32 x 2-25/32 x 9/64 ½ ton 4WD 127” WB: 8-1/8 x 2-13/16 x 3/16 ¾ ton 4WD: 8-1/8 x 2-13/16 x 3/16 As you can see, even the ½ ton 4WD long bed uses the same size frame member as the one ton 2WD. 1960-62 frame ,measurements ½ ton 2WD: 5-15/32 x 2-1/4 x 1/8 ¾ ton 2WD: 7-3/16 x 2-3/4 x 3/16 ½ and ¾ ton 4WD: 7-13/64 x 2-3/4 x 3/16 __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

02-26-2021, 08:09 PM	#8
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Frame question 1/2 ton vs 3/4 ton Could someone please verify that the frame for the 4x4's are actually 8 inches tall? __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

02-26-2021, 10:09 PM	#9
66x3 Registered User Join Date: Dec 2018 Location: Bellevue, MI Posts: 118	Re: Frame question 1/2 ton vs 3/4 ton I can check tomorrow ,66 K 20 4x4 and let you know.

02-27-2021, 02:00 PM	#10
66x3 Registered User Join Date: Dec 2018 Location: Bellevue, MI Posts: 118	Re: Frame question 1/2 ton vs 3/4 ton Confirmation: My 66 K 20 frame is somewhere between 8-8.25 measured from about the center under the cab. Didn't want to roll around in the snow to check further!

02-27-2021, 11:19 PM	#11
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: Frame question 1/2 ton vs 3/4 ton Thanks. I wonder if they made the frame taller because a 4x4 may need to resist more twisting. __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.