wil this work? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

79C10 · 01-12-2005, 11:39 PM

I have a 79 K10 with a 250 straight six th350 trans and I was wondering if I could transport the rear axel out of a 78 1 ton dually into my K10 ditch the stock and run it as a short bed dually. I was wondering if my four wheel drive would still work alright?

I have a thread in the 73-87 Message Board about this and thought this might be a better place to post this topic

thanks alot

1969 GMC · 01-13-2005, 01:27 AM

you could do it, have to move the spring perches and maybe the shock mounts. but, do the dually and your K10 have the same gear ratio? if they didn't you would not be able to put the truck into 4wd on pavement, unless you want to break something. another thing to consider is you now need 2 spares, one for 6 lug and one for 8. also, you will need to figure something to cover your outermost rear tires, unless you want mud and crap all over the side of your truck. I personally dont think it sounds like a good idea, but they are your trucks.

79C10 · 01-13-2005, 09:09 AM

I really doubt they have the same gear ratio. just curios if I put the dana 60 under the front it would work right(as long as it had the same gears) only need one spare that way

**JIMs70GMC** · 01-13-2005, 09:17 AM

if you swap both front and rear axles under the 1/2 ton then it'll work. The front would bolt in. the rear will need perches and shock mounts moved.
Where are you located at? Is it a cab and chassis or does the dually have a truck bed?

79C10 · 01-13-2005, 09:32 AM

the dually has a twelve foot all steal flat bed on it. The doors and fenders are shot other than that its not too bad. I would have to find a front axel but that may be the route I go.

thank

**JIMs70GMC** · 01-13-2005, 10:01 AM

I assumed it was a 4wd dually.

Rod · 01-13-2005, 10:52 AM

Does the dually 1 ton rear not have the same spring purchase distance on the rear..thought I read that here somewhere.

**JIMs70GMC** · 01-13-2005, 02:22 PM

not on the 73 and up trucks. The 72 and down trucks the 2wd 1 ton and 4wd chassis have the same spacing.

LONGHAIR · 01-13-2005, 07:43 PM

You have to watch out for length. There is a difference between a "dually pick-up" and a cab & chassis (like those used in utility box trucks)
The dually pick-up has a longer axle so the the inner tire runs approximately where a single tire would on a standard truck. On a typical cab & chassis the outer wheel rides about where the single does, because those boxes are not much wider than a pick-up bed and the tires don't stick out.

01-12-2005, 11:39 PM	#1
79C10 Registered User Join Date: Jan 2005 Location: Northern Vermont Posts: 159	wil this work? I have a 79 K10 with a 250 straight six th350 trans and I was wondering if I could transport the rear axel out of a 78 1 ton dually into my K10 ditch the stock and run it as a short bed dually. I was wondering if my four wheel drive would still work alright? I have a thread in the 73-87 Message Board about this and thought this might be a better place to post this topic thanks alot

01-13-2005, 01:27 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	you could do it, have to move the spring perches and maybe the shock mounts. but, do the dually and your K10 have the same gear ratio? if they didn't you would not be able to put the truck into 4wd on pavement, unless you want to break something. another thing to consider is you now need 2 spares, one for 6 lug and one for 8. also, you will need to figure something to cover your outermost rear tires, unless you want mud and crap all over the side of your truck. I personally dont think it sounds like a good idea, but they are your trucks. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-13-2005, 09:17 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	if you swap both front and rear axles under the 1/2 ton then it'll work. The front would bolt in. the rear will need perches and shock mounts moved. Where are you located at? Is it a cab and chassis or does the dually have a truck bed? __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

01-13-2005, 10:01 AM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I assumed it was a 4wd dually. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

01-13-2005, 10:52 AM	#7
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Does the dually 1 ton rear not have the same spring purchase distance on the rear..thought I read that here somewhere. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-13-2005, 09:09 AM	#3
79C10 Registered User Join Date: Jan 2005 Location: Northern Vermont Posts: 159	I really doubt they have the same gear ratio. just curios if I put the dana 60 under the front it would work right(as long as it had the same gears) only need one spare that way

01-13-2005, 09:32 AM	#5
79C10 Registered User Join Date: Jan 2005 Location: Northern Vermont Posts: 159	the dually has a twelve foot all steal flat bed on it. The doors and fenders are shot other than that its not too bad. I would have to find a front axel but that may be the route I go. thank

01-13-2005, 02:22 PM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	not on the 73 and up trucks. The 72 and down trucks the 2wd 1 ton and 4wd chassis have the same spacing. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

01-13-2005, 07:43 PM	#9
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	You have to watch out for length. There is a difference between a "dually pick-up" and a cab & chassis (like those used in utility box trucks) The dually pick-up has a longer axle so the the inner tire runs approximately where a single tire would on a standard truck. On a typical cab & chassis the outer wheel rides about where the single does, because those boxes are not much wider than a pick-up bed and the tires don't stick out.



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