Switching frames frm 2wd 3/4 to 4 wd 3/4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

O'skool 72GMC · 10-22-2010, 07:25 PM

So I just bought another truck and I'm thinking of switching the frame to a 4wd 3/4 from a 2wd 3/4. Anybody done this before? suggestions.
The 72 chevy i picked up is a c20 auto with 402 (see pics)

I'd like to go with a 350 motor and trans with np205 transfer case.
Thanks,
O

**special-K** · 10-22-2010, 10:15 PM

The C/20 with a high hump cab is a perfect donor.They use the same cab mounts,if the originals are still good enough to reuse.It's pretty much just a matter of swapping the body onto the K-model frame.

O'skool 72GMC · 12-23-2010, 02:48 AM

So the c-20 i picked up is a low hump. Any ideas

JimKshortstep4x4 · 12-23-2010, 06:51 AM

It is easy enough to change out the low hump to a high hump. I use a plasma cutter to cut out the low hump. The high hump is used to locate the mounting holes and then weld in the weld nuts. Turns out looking like factory.

Jim

10-22-2010, 07:25 PM	#1
O'skool 72GMC Registered User Join Date: Jan 2002 Location: San Diego, CA, USA Posts: 251	Switching frames frm 2wd 3/4 to 4 wd 3/4 So I just bought another truck and I'm thinking of switching the frame to a 4wd 3/4 from a 2wd 3/4. Anybody done this before? suggestions. The 72 chevy i picked up is a c20 auto with 402 (see pics) I'd like to go with a 350 motor and trans with np205 transfer case. Thanks, O

10-22-2010, 10:15 PM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Switching frames frm 2wd 3/4 to 4 wd 3/4 The C/20 with a high hump cab is a perfect donor.They use the same cab mounts,if the originals are still good enough to reuse.It's pretty much just a matter of swapping the body onto the K-model frame. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-23-2010, 02:48 AM	#3
O'skool 72GMC Registered User Join Date: Jan 2002 Location: San Diego, CA, USA Posts: 251	Re: Switching frames frm 2wd 3/4 to 4 wd 3/4 So the c-20 i picked up is a low hump. Any ideas

12-23-2010, 06:51 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Switching frames frm 2wd 3/4 to 4 wd 3/4 It is easy enough to change out the low hump to a high hump. I use a plasma cutter to cut out the low hump. The high hump is used to locate the mounting holes and then weld in the weld nuts. Turns out looking like factory. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

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