Question - 3/4 ton to 1/2 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GreenAcres · 03-09-2010, 09:19 AM

Are six-lug and eight lug axles interchangable? What about the front?

Other "major" consideration to convert a '67 3/4 ton to 'XX 1/2 ton, 6-lug?

If there's been a thread in the past maybe someone knows the title, or can post a link?

Thanks,
John

Shyguy · 03-09-2010, 09:38 AM

The easiest way to do what you want is to find a 1/2 ton donor and swap the rearend and front cradle with suspension into your 3/4 ton frame.

If you get a '71 or '72 will have 5 lug wheels with disc brakes on the front.

There are other ways of doing it of course, but I have found this easiest.

Danny

GreenAcres · 03-09-2010, 10:02 AM

Thanks Danny,

So other than the suspension, 1/2 and 3/4 ton frames are the same?

Shyguy · 03-09-2010, 10:12 AM

The 3/4 ton and 1/2 ton frames are basically the same with a few differences.

The rear cab mounts on a 3/4 ton frame are lower to allow for a thicker rubber mount to allow for a smoother ride in the cab.

The 3/4 ton frame has extra bracing at the cross-member where the trailing arms mount and the trailing arms are stronger because the have extra plates on them.

I am sure some one will chime in with more informations.

Also the '67 frame does not have the dimple for the steering box.

Danny

03-09-2010, 09:19 AM	#1
GreenAcres "I tawt I taw a puddy tat!" Join Date: Feb 2010 Location: KC Posts: 109	Question - 3/4 ton to 1/2 ton Are six-lug and eight lug axles interchangable? What about the front? Other "major" consideration to convert a '67 3/4 ton to 'XX 1/2 ton, 6-lug? If there's been a thread in the past maybe someone knows the title, or can post a link? Thanks, John __________________ '67 C/20 LWB CST 283/SM420 FleetWood - project "HELL!" '68 GMC 1500 SWB Fleetside 250/TOT SOLD '70 C/10 454/TH400 LWB SOLD

03-09-2010, 09:38 AM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Question - 3/4 ton to 1/2 ton The easiest way to do what you want is to find a 1/2 ton donor and swap the rearend and front cradle with suspension into your 3/4 ton frame. If you get a '71 or '72 will have 5 lug wheels with disc brakes on the front. There are other ways of doing it of course, but I have found this easiest. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

03-09-2010, 10:02 AM	#3
GreenAcres "I tawt I taw a puddy tat!" Join Date: Feb 2010 Location: KC Posts: 109	Re: Question - 3/4 ton to 1/2 ton Thanks Danny, So other than the suspension, 1/2 and 3/4 ton frames are the same? __________________ '67 C/20 LWB CST 283/SM420 FleetWood - project "HELL!" '68 GMC 1500 SWB Fleetside 250/TOT SOLD '70 C/10 454/TH400 LWB SOLD

03-09-2010, 10:12 AM	#4
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Question - 3/4 ton to 1/2 ton The 3/4 ton and 1/2 ton frames are basically the same with a few differences. The rear cab mounts on a 3/4 ton frame are lower to allow for a thicker rubber mount to allow for a smoother ride in the cab. The 3/4 ton frame has extra bracing at the cross-member where the trailing arms mount and the trailing arms are stronger because the have extra plates on them. I am sure some one will chime in with more informations. Also the '67 frame does not have the dimple for the steering box. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.



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