Dually Conversion??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevyguy111786 · 08-29-2003, 10:54 PM

I am thinking about putting a dually rear end on the butt end of my 70 C10. What year truck should i look for. It's a 1/2 ton, but can i use a 3/4 ton or a 1 ton axle. I would like to get one fairly cheap, junk yard maybe or board member??? Thanks

Chevyguy111786 · 08-30-2003, 02:53 PM

anyone...does anyone have any ideas of what year to look for?? at all??

*gmtrucksaddict* · 08-31-2003, 01:35 PM

do you have coils or leaf ?

you can mount duallies on the rear axle you have right now if its 8lug, no rear axle swap necessary,conoverbandit did thison his C20 pickup, will work on K20 also, just find four matching 16" duallies and put them on withflat dually nuts,

Chevyguy111786 · 08-31-2003, 11:38 PM

thanx

bretthan · 10-04-2003, 02:44 PM

it might be a little late, but check out arrowcraft conversions http://www.arrowcraft.com/ . they have adapters for 5 lug rear ends http://www.arrowcraft.com/f_adaptors.htm. i think the maxi 235's would work, plus they allow you to use any custom rim.

Chevyguy111786 · 10-04-2003, 03:28 PM

yeah i checked them out, but a conversion kit is like 600 dollars...i also have a 6lug rear end...i'm just gonne get a used rear end and get a new driveshaft to fit both ends

Hardrock2 · 10-06-2003, 02:09 AM

Here'sa pic of one with duals on a "single wheel" rear axle.

Looks good, IMO.

When ya do it like this, with a single wheel rear, you should definetly install later (bigger, longer) wheel studs to accomodate the increased thickness of two rims. Use the flat-back (not conical) lug nuts for duallys.

Also, something to watch..........inner wheel tub-to-floor bolts.

I know on '73-up trucks, the bolts will eat the sidewall of a tire in a hurry!! I think '67-'72 trucks have shorter bolts, but still worth watching.

Mike

**JIMs70GMC** · 10-06-2003, 06:40 AM

I like the looks of that!

So there's plenty of space to run dually rims on the front or is there a spacer up front? In the rear is there a spacer between the rims?
How much do dually rims cost, steel? aluminum?
Do they come in 8 lug 15" size, I guess they would not clear the drum for the rear?

I was thinking of getting dually rims for the rear 16" diameter and running 34x9.5/16 TSLs to match my front 33s, kinda like the cement truck look.

rambler · 10-06-2003, 12:18 PM

I'll be doing this with my 67 C20 soon, so I'm glad all I'll need is to find wheels and not a conversion kit!

Hardrock2 · 10-06-2003, 02:06 PM

You need to know what brakes you have in the rear.
On our trucks, (67-72) I think, they were all small rear drums.

If you have a '73-up, or have swapped to a '73-up rear end, you have to have the small brakes to fit dually rims.

Big brakes won't let the rim seat against the hub, (drums are larger dia. than inside of rim) True duallys remedy this by moving the drums, backing plates INBOARD to clear the rim.

One way around this is to go to 19.5 rims instead of 16's.

I've never seen any custom wheels in 19.5 X 8 lug, and the tires aren't as cheap as 16's, but they do make SS simulators for the 19.5's with 8 lug. Look at the next Snap-On P-series tool van you see. Those series trucks have 19.5's that fit the 8- lug pickup pattern.
Anybody for a slammed dually on 20's?.......er, well........19.5's??

Up front, you have to use either adapters, or swap to 1 ton spindles and hubs. Cheap on 2WD trucks, $$$ on 4X4's!

Mike

**JIMs70GMC** · 10-07-2003, 05:22 AM

Would 12" drums be considered small? I think it is because the 14 bolts had 13+" drums.

08-29-2003, 10:54 PM	#1
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	Dually Conversion??? I am thinking about putting a dually rear end on the butt end of my 70 C10. What year truck should i look for. It's a 1/2 ton, but can i use a 3/4 ton or a 1 ton axle. I would like to get one fairly cheap, junk yard maybe or board member??? Thanks

08-30-2003, 02:53 PM	#2
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	TTT anyone...does anyone have any ideas of what year to look for?? at all??

10-04-2003, 02:44 PM	#5
bretthan Damn those ricers Join Date: Apr 2003 Location: Red Deer, Alberta Canada Posts: 51	dually conversion it might be a little late, but check out arrowcraft conversions http://www.arrowcraft.com/ . they have adapters for 5 lug rear ends http://www.arrowcraft.com/f_adaptors.htm. i think the maxi 235's would work, plus they allow you to use any custom rim. __________________ 1994 Chevy Cheyenne C1500 ext.cab s/box Nothin special right now, just got a 350 with no cat. converter, and a magnaflow muffler In God We Trust, Vengeance is Mine, Sayeth the Lord, NO FEAR! Indian Larry 1949-2004

10-06-2003, 02:09 AM	#7
Hardrock2 A$$ deep into trucks Join Date: Dec 2002 Location: Central Illinois,USA Posts: 249	Here'sa pic of one with duals on a "single wheel" rear axle. Looks good, IMO. When ya do it like this, with a single wheel rear, you should definetly install later (bigger, longer) wheel studs to accomodate the increased thickness of two rims. Use the flat-back (not conical) lug nuts for duallys. Also, something to watch..........inner wheel tub-to-floor bolts. I know on '73-up trucks, the bolts will eat the sidewall of a tire in a hurry!! I think '67-'72 trucks have shorter bolts, but still worth watching. Mike Attached Images __________________ hardrock2

10-06-2003, 06:40 AM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I like the looks of that! So there's plenty of space to run dually rims on the front or is there a spacer up front? In the rear is there a spacer between the rims? How much do dually rims cost, steel? aluminum? Do they come in 8 lug 15" size, I guess they would not clear the drum for the rear? I was thinking of getting dually rims for the rear 16" diameter and running 34x9.5/16 TSLs to match my front 33s, kinda like the cement truck look. __________________ 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 Last edited by JIMs70GMC; 10-06-2003 at 06:50 AM.

08-31-2003, 01:35 PM	#3
gmtrucksaddict Account Suspended Join Date: Aug 2003 Location: IL Posts: 60	do you have coils or leaf ? you can mount duallies on the rear axle you have right now if its 8lug, no rear axle swap necessary,conoverbandit did thison his C20 pickup, will work on K20 also, just find four matching 16" duallies and put them on withflat dually nuts,

08-31-2003, 11:38 PM	#4
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	thanx

10-04-2003, 03:28 PM	#6
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	yeah i checked them out, but a conversion kit is like 600 dollars...i also have a 6lug rear end...i'm just gonne get a used rear end and get a new driveshaft to fit both ends

10-06-2003, 12:18 PM	#9
rambler MOVE OVER Join Date: Jun 2002 Location: Warrensburg, MO Posts: 5,470	I'll be doing this with my 67 C20 soon, so I'm glad all I'll need is to find wheels and not a conversion kit! __________________ No matter where you are..... There you are... Buckaroo Banzi

10-06-2003, 02:06 PM	#10
Hardrock2 A$$ deep into trucks Join Date: Dec 2002 Location: Central Illinois,USA Posts: 249	You need to know what brakes you have in the rear. On our trucks, (67-72) I think, they were all small rear drums. If you have a '73-up, or have swapped to a '73-up rear end, you have to have the small brakes to fit dually rims. Big brakes won't let the rim seat against the hub, (drums are larger dia. than inside of rim) True duallys remedy this by moving the drums, backing plates INBOARD to clear the rim. One way around this is to go to 19.5 rims instead of 16's. I've never seen any custom wheels in 19.5 X 8 lug, and the tires aren't as cheap as 16's, but they do make SS simulators for the 19.5's with 8 lug. Look at the next Snap-On P-series tool van you see. Those series trucks have 19.5's that fit the 8- lug pickup pattern. Anybody for a slammed dually on 20's?.......er, well........19.5's?? Up front, you have to use either adapters, or swap to 1 ton spindles and hubs. Cheap on 2WD trucks, $$$ on 4X4's! Mike __________________ hardrock2 Last edited by Hardrock2; 10-06-2003 at 02:08 PM.

10-07-2003, 05:22 AM	#11
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Would 12" drums be considered small? I think it is because the 14 bolts had 13+" drums. __________________ 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



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