Switching to a 4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

supermanox · 04-13-2005, 09:49 AM

I have a 72 Sierra Grande that I'm thinking of putting on a 4x4 frame. Will any 4x4 from 67-72 fit? Or are there any success/horror stories about doing this?

*dtlilly* · 04-13-2005, 10:32 AM

Your 72 will bolt right up to a 67-72 chassis, you need either the high hump cab or a body lift kit to clear the transfer case. That body will mount on a newer chassis, but you need to reconfigure your body mounts (contact mudder67, that is what he did).

Rod · 04-13-2005, 10:48 AM

I'd say best option is to find a 71-72 chassis at least...you'd keep disc brake that way up front....no need for body frame mounts to be moved in that case also.....just a 3/4 ton or 4x4 rubber mount body kit as there bigger on 4x4's than 2 wd 1/2 tons.

A 4x4 truck chassis is best but done a 4x4 suburban chassis also. Only need to exchange the rear cab mounts and mounts for the box off the frame for a swap too.

jlhusa1 · 04-13-2005, 08:06 PM

I have done the swap with a '72 K20 Suburban chassis. Like Rod said all you have to do is transfer the rear cab mount bracket and the bed mounts. You will also have to cut 11" off the frame and redrill holes for the rear bumper brackets. like dtlilly said you will need a high hump center floorboard. I have one if you would like it. I have some other parts too if you're interested.

**JIMs70GMC** · 04-13-2005, 08:48 PM

I put a 70 C20 cab on a 71 K20 chassis. I cut the low hump out of the C20 and bolted in the high hump from the old cab. The C20 was auto and the 71 a 4spd, so I swapped steering columns and had to bypass the neutral safety switch for the auto. As far as body mounts by ones for a 4wd and you'll have what you need.

CHEVY SAM · 06-07-2005, 07:28 PM

hey y'all I am puting a 80 c10 cab on a 78 k5 chassis. Same thing??

69ssnova · 06-07-2005, 07:51 PM

do you have a frame

04-13-2005, 09:49 AM	#1
supermanox Registered User Join Date: Jun 2003 Location: Asheville, NC Posts: 36	Switching to a 4x4 I have a 72 Sierra Grande that I'm thinking of putting on a 4x4 frame. Will any 4x4 from 67-72 fit? Or are there any success/horror stories about doing this? __________________ -Mike Cooper Asheville NC 1972 GMC Sierra Grande (Stock) 1972 Chevy (Not so much stock)

04-13-2005, 10:48 AM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	I'd say best option is to find a 71-72 chassis at least...you'd keep disc brake that way up front....no need for body frame mounts to be moved in that case also.....just a 3/4 ton or 4x4 rubber mount body kit as there bigger on 4x4's than 2 wd 1/2 tons. A 4x4 truck chassis is best but done a 4x4 suburban chassis also. Only need to exchange the rear cab mounts and mounts for the box off the frame for a swap too. __________________ 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.

04-13-2005, 08:48 PM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I put a 70 C20 cab on a 71 K20 chassis. I cut the low hump out of the C20 and bolted in the high hump from the old cab. The C20 was auto and the 71 a 4spd, so I swapped steering columns and had to bypass the neutral safety switch for the auto. As far as body mounts by ones for a 4wd and you'll have what you need. __________________ 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

04-13-2005, 10:32 AM	#2
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	Your 72 will bolt right up to a 67-72 chassis, you need either the high hump cab or a body lift kit to clear the transfer case. That body will mount on a newer chassis, but you need to reconfigure your body mounts (contact mudder67, that is what he did).

04-13-2005, 08:06 PM	#4
jlhusa1 Registered User Join Date: Mar 2005 Posts: 15	I have done the swap with a '72 K20 Suburban chassis. Like Rod said all you have to do is transfer the rear cab mount bracket and the bed mounts. You will also have to cut 11" off the frame and redrill holes for the rear bumper brackets. like dtlilly said you will need a high hump center floorboard. I have one if you would like it. I have some other parts too if you're interested.

06-07-2005, 07:28 PM	#6
CHEVY SAM Registered User Join Date: May 2005 Posts: 3	hey y'all I am puting a 80 c10 cab on a 78 k5 chassis. Same thing??

06-07-2005, 07:51 PM	#7
69ssnova Registered User Join Date: Dec 2002 Location: rock hill sc Posts: 69	do you have a frame



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