C2500 to K2500 ('70 GMC) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

solarus81 · 07-15-2005, 11:47 PM

Here is the story,

Got a '70 GMC 402/400 14 bolt FF, ac cab, etc. I'm wanting to convert this thing to 4wd.(I know

) I dont want to swap frames. Anyone out there do this kinda thing?

I plan on doing light offroading/mudding and highway driving. Want the ratio to be around 3.07 (dont ask) overall.

First step would be putting the front axle under it, but only RWD, then put in the transfercase and front driveline.

If it's too much a PITA, just swap the whole thing for a 1 ton or 3/4 with a crap body.

Anyone?

BobS · 07-18-2005, 01:56 PM

It will be much easier and cheaper to swap frames. Find a 4x4 with good running gear and swap it all over at the same time.

Bob

solarus81 · 07-18-2005, 08:27 PM

Sure... it's easier... but have you tried to find a 4wd 3/4 ton 67-72 chevy truck in Washington state for $300? I havent. Besides... I want to be different.

**JIMs70GMC** · 07-19-2005, 06:32 AM

I went 600 miles to get my rolling chassis that is now my 71 Chevy.

I've seen a 2wd that was converted to 4wd it originally had a coil rear.

The problems w/ that 402 will be, location it sits forward and needs to move back to keep the axle from hitting the oil pan. Also needs to go back for front driveshaft length. Of course if you fine a divorce transfercase from a 69-74 dodge w/ cross member then it would not be too bad. You'll need the front spring brackets and and the brackets for the rear of the front springs. You'll also need to move your e-brake cable where it goes through the fram as that's where one of the rear brackets goes. Also where the rear of the front springs bracket goes you'll need to hammer the frame flat. PM yukon jack he has a buddy w/ a 70 1 ton dually that was converted to 4wd.
If you have leaves in the rear then your good to go, except if you want to lift it, the 2wd leaves are narrower than the 4wd leaves.

ckhd · 07-19-2005, 10:53 AM

I had a friend that did this, and he says he was stupid for doing it. He also says he will NEVER do it again.

ckhd · 07-19-2005, 10:54 AM

Oh, and by the way, he's a mechanic for a living, and a CAT certified welder.

Fireballs · 07-19-2005, 09:42 PM

I have a 1969 3/4 ton 4.09 front and 4.10 rear end pulled in the yard. Also an old blazer frame you can use for hangers, and a core TH350 with NP205 case with drivelines somewhere in the bed of a truck. I should have a PS box also.
I will take $250 for the parts.
Bring trailer if you want the blazer frame.
Bellingham, WA.

07-15-2005, 11:47 PM	#1
solarus81 Registered User Join Date: Jul 2005 Location: Auburn, WA Posts: 4	C2500 to K2500 ('70 GMC) Here is the story, Got a '70 GMC 402/400 14 bolt FF, ac cab, etc. I'm wanting to convert this thing to 4wd.(I know ) I dont want to swap frames. Anyone out there do this kinda thing? I plan on doing light offroading/mudding and highway driving. Want the ratio to be around 3.07 (dont ask) overall. First step would be putting the front axle under it, but only RWD, then put in the transfercase and front driveline. If it's too much a PITA, just swap the whole thing for a 1 ton or 3/4 with a crap body. Anyone?

07-18-2005, 01:56 PM	#2
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	It will be much easier and cheaper to swap frames. Find a 4x4 with good running gear and swap it all over at the same time. Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

07-19-2005, 06:32 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I went 600 miles to get my rolling chassis that is now my 71 Chevy. I've seen a 2wd that was converted to 4wd it originally had a coil rear. The problems w/ that 402 will be, location it sits forward and needs to move back to keep the axle from hitting the oil pan. Also needs to go back for front driveshaft length. Of course if you fine a divorce transfercase from a 69-74 dodge w/ cross member then it would not be too bad. You'll need the front spring brackets and and the brackets for the rear of the front springs. You'll also need to move your e-brake cable where it goes through the fram as that's where one of the rear brackets goes. Also where the rear of the front springs bracket goes you'll need to hammer the frame flat. PM yukon jack he has a buddy w/ a 70 1 ton dually that was converted to 4wd. If you have leaves in the rear then your good to go, except if you want to lift it, the 2wd leaves are narrower than the 4wd leaves. __________________ 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

07-19-2005, 10:53 AM	#5
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	I had a friend that did this, and he says he was stupid for doing it. He also says he will NEVER do it again. __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

07-19-2005, 10:54 AM	#6
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	Oh, and by the way, he's a mechanic for a living, and a CAT certified welder. __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

07-18-2005, 08:27 PM	#3
solarus81 Registered User Join Date: Jul 2005 Location: Auburn, WA Posts: 4	Sure... it's easier... but have you tried to find a 4wd 3/4 ton 67-72 chevy truck in Washington state for $300? I havent. Besides... I want to be different.

07-19-2005, 09:42 PM	#7
Fireballs Registered User Join Date: May 2004 Location: Mt Vernon, WA Posts: 11	I have a 1969 3/4 ton 4.09 front and 4.10 rear end pulled in the yard. Also an old blazer frame you can use for hangers, and a core TH350 with NP205 case with drivelines somewhere in the bed of a truck. I should have a PS box also. I will take $250 for the parts. Bring trailer if you want the blazer frame. Bellingham, WA.



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