4x4 conversion question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

justplainjoe · 11-28-2003, 08:27 PM

I've got a 72 GMC 3/4 ton and am looking to convert it to 4wd. The donor truck I have found is a 73 3/4 ton. Does anyone know how much difference there is between the 2 trucks as for frame, spring perchs, and axle. I need to act on this donor cause it is still complete. I will go look at it tomorrow.
Thanks, justplainjoe

Longhorn Man · 11-28-2003, 11:33 PM

If you plan on a body lift, you could just transplant your body onto that chassis.

justplainjoe · 11-28-2003, 11:48 PM

I was planning to install the leafs, axle, steering box, tranny and t-case from the 73. Do you know if the frames changed much between 72 to 73?

Longhorn Man · 11-28-2003, 11:53 PM

Yes they did...quite a bit. But if you do a body lift...then you can get by with it.
Do you have the LMC catalog with the red 67 stepside 4X4 on the black-ish back ground? That is a 67 on a 73 - 87 chassis. It belongs to a boardmember here...67mudder.

Mudder · 11-29-2003, 11:49 AM

Mudder67, Andy

justplainjoe · 11-29-2003, 01:08 PM

Thanks for the information. I'll just keep a look out for a 67-72 3/4 for a donor. I want to make it as easy as possible.

Mudder · 11-29-2003, 01:12 PM

PM sent..........

Longhorn Man · 11-30-2003, 03:28 AM

Mudder67...dislexia is a hctib.

rbamford · 12-03-2003, 10:56 PM

I have a similar interest as justplainjoe's conversion. Joe, I would be curious how it goes. Could someone expand on the body lift aspect? What is in the way? How much lift? thanks everyone.

Mudder · 12-04-2003, 04:09 AM

I used a body lift becasue I had a low hump (2wheel cab). With a high hump I could have done away with a lot of the body lift. I believe you will have to use some to keep the body lines straight with the differences in the frames.

00droptopSS · 12-04-2003, 11:24 AM

Do most of the body mounts line up or do you have to fab new mounts?

Mudder · 12-04-2003, 12:41 PM

You have to fab new ones. The cab you use the older mounts and mount to the outside of the frame. (The newer trucks cab mounts are on the inside of the frame).

11-28-2003, 08:27 PM	#1
justplainjoe Registered User Join Date: Jul 2003 Location: Gilbert, AZ Posts: 70	4x4 conversion question I've got a 72 GMC 3/4 ton and am looking to convert it to 4wd. The donor truck I have found is a 73 3/4 ton. Does anyone know how much difference there is between the 2 trucks as for frame, spring perchs, and axle. I need to act on this donor cause it is still complete. I will go look at it tomorrow. Thanks, justplainjoe

12-04-2003, 11:24 AM	#11
00droptopSS 2.5/4 on 20's Join Date: Aug 2001 Location: Shreveport, LA Posts: 392	Do most of the body mounts line up or do you have to fab new mounts? __________________ 62 C/10 SWB. Currently in ground up resto. Big back window cab, V8, auto. My wife's grandfather's truck. 1965 Mustang Vert - Shelby Clone 2005 Dodge SRT-10 My Old 72 SWB

11-28-2003, 11:33 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	If you plan on a body lift, you could just transplant your body onto that chassis.

11-28-2003, 11:48 PM	#3
justplainjoe Registered User Join Date: Jul 2003 Location: Gilbert, AZ Posts: 70	I was planning to install the leafs, axle, steering box, tranny and t-case from the 73. Do you know if the frames changed much between 72 to 73?

11-28-2003, 11:53 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Yes they did...quite a bit. But if you do a body lift...then you can get by with it. Do you have the LMC catalog with the red 67 stepside 4X4 on the black-ish back ground? That is a 67 on a 73 - 87 chassis. It belongs to a boardmember here...67mudder.

11-29-2003, 11:49 AM	#5
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Mudder67, Andy

11-29-2003, 01:08 PM	#6
justplainjoe Registered User Join Date: Jul 2003 Location: Gilbert, AZ Posts: 70	Thanks for the information. I'll just keep a look out for a 67-72 3/4 for a donor. I want to make it as easy as possible.

11-29-2003, 01:12 PM	#7
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	PM sent..........

11-30-2003, 03:28 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Mudder67...dislexia is a hctib.

12-03-2003, 10:56 PM	#9
rbamford Registered User Join Date: Dec 2003 Location: Reno, Nevada Posts: 7	I have a similar interest as justplainjoe's conversion. Joe, I would be curious how it goes. Could someone expand on the body lift aspect? What is in the way? How much lift? thanks everyone.

12-04-2003, 04:09 AM	#10
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	I used a body lift becasue I had a low hump (2wheel cab). With a high hump I could have done away with a lot of the body lift. I believe you will have to use some to keep the body lines straight with the differences in the frames.

12-04-2003, 12:41 PM	#12
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	You have to fab new ones. The cab you use the older mounts and mount to the outside of the frame. (The newer trucks cab mounts are on the inside of the frame).



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