convert c30 dump to 4wd ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tkeduk8r** · 04-11-2016, 11:49 AM

Have the opportunity to possibly purchase a 77 K30 dually fairly cheap and was wondering how much of a hassle, or all whats involved to convert my 68 c30 over to a 1-ton 4wd. The '77 is SM465, same as mine, has NP205, AND has had the differentials have been changed out to 3.73 (which I like). Just not sure what it would all take. If i remember right the front spring perch lengths are different... other than that though I don't have that experience. Thanks in advance... OH and I have access to a 70 K20 chassis for some parts.
--Mike

davepl · 04-11-2016, 12:03 PM

If anyone has the right parts on hand, sounds like you do! I don't know the answer, but I'm in just to find out what fits.

**tkeduk8r** · 04-12-2016, 04:44 PM

ttt... moderators move if this is more a 4x4 question.....
--Mike

SS Tim · 04-12-2016, 04:53 PM

There are a number of C30 4x4 conversion threads, just use the search function.

Lee.c · 04-12-2016, 10:59 PM

I've converted 3 trucks over to 4 wheel drive. The frames are a little different shaped but you can make all the 77 hangers and cross member fit. Where the rear hangers go your going to need to flatten a bulge out in the frame. The rear of the trucks going to need to be raised either with the 4 wheel drive hangers or lift blocks. Your also going to need to shorten the rear driveshaft. The last time I did one was probably ten years ago so I'm sure I'm forgetting some details but I'm still driving the truck.(69 C30) If you leave the 2 wheel drive stearing box on it you can convert it crossover stearing. I left the front clip on and just supported the engine with an engine crane on all of them I did. There's a lot of holes to drill but you can do the front swap in a weekend and still drive it as 2 wheel drive then put the transmition and transfer case in later.. You'll have to cut a hole for the shifter and get a longer speedometer cable also. The fastest way is to cut the frame and weld on on a 4x4 front frame but I don't think its going to work with the 3 different frames you have

04-11-2016, 11:49 AM	#1
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	convert c30 dump to 4wd ??? Have the opportunity to possibly purchase a 77 K30 dually fairly cheap and was wondering how much of a hassle, or all whats involved to convert my 68 c30 over to a 1-ton 4wd. The '77 is SM465, same as mine, has NP205, AND has had the differentials have been changed out to 3.73 (which I like). Just not sure what it would all take. If i remember right the front spring perch lengths are different... other than that though I don't have that experience. Thanks in advance... OH and I have access to a 70 K20 chassis for some parts. --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

04-11-2016, 12:03 PM	#2
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: convert c30 dump to 4wd ??? If anyone has the right parts on hand, sounds like you do! I don't know the answer, but I'm in just to find out what fits. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

04-12-2016, 04:44 PM	#3
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: convert c30 dump to 4wd ??? ttt... moderators move if this is more a 4x4 question..... --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

04-12-2016, 04:53 PM	#4
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: convert c30 dump to 4wd ??? There are a number of C30 4x4 conversion threads, just use the search function. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

04-12-2016, 10:59 PM	#5
Lee.c Registered User Join Date: Nov 2015 Location: Parma Michigan Posts: 6	Re: convert c30 dump to 4wd ??? I've converted 3 trucks over to 4 wheel drive. The frames are a little different shaped but you can make all the 77 hangers and cross member fit. Where the rear hangers go your going to need to flatten a bulge out in the frame. The rear of the trucks going to need to be raised either with the 4 wheel drive hangers or lift blocks. Your also going to need to shorten the rear driveshaft. The last time I did one was probably ten years ago so I'm sure I'm forgetting some details but I'm still driving the truck.(69 C30) If you leave the 2 wheel drive stearing box on it you can convert it crossover stearing. I left the front clip on and just supported the engine with an engine crane on all of them I did. There's a lot of holes to drill but you can do the front swap in a weekend and still drive it as 2 wheel drive then put the transmition and transfer case in later.. You'll have to cut a hole for the shifter and get a longer speedometer cable also. The fastest way is to cut the frame and weld on on a 4x4 front frame but I don't think its going to work with the 3 different frames you have



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