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Old 11-05-2013, 10:30 AM   #1
pwdcougar
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4X4 68 - 72 Suburban Frames

Does anyone know if the Suburban 4WD and 2WD frames are the same for the 68 - 72 trucks?

From what I can tell the pick up frames are different.

Thanks

Paul
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Old 11-05-2013, 12:58 PM   #2
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Re: 4X4 68 - 72 Suburban Frames

Yes they are different.
There are a few differences that I have heard of, but I know for a fact that the rear frame ends are different. Suburban has rear finished horns that turn down a bit, where as PU's are cut straight.
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Old 11-05-2013, 02:51 PM   #3
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Re: 4X4 68 - 72 Suburban Frames

Chris my plan is to try to take the 2WD frame from one Suburban and put the 4WD Suburban drivetrain on it.

Do the Suburban 2 and 4 wheel drive frames share the same differences as the pickup 2 and 4 wheel drive frames?

After reading up on them, the pickup frames need lots of modification to adapt 4WD components to the 2WD frame.
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1969 Mercury Cougar Standard 4 speed
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Old 11-05-2013, 07:36 PM   #4
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Re: 4X4 68 - 72 Suburban Frames

The same 2 to 4 changes for pickup frames also apply to Suburban frames. What is damaged on the 4wd frame?
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Old 11-05-2013, 07:36 PM   #5
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Re: 4X4 68 - 72 Suburban Frames

Just the thought of converting a coil sprung suspension to leaf springs makes me shudder, but then again I am not that talented in the art of fabrication and conversion.

I could swear I have seen a project like that here on the forum though...

Just thinking out loud here...
If I were to contemplate doing something like this, I would go with modern upgrade suspension components instead of converting vintage OE for vintage OE. At least in your case you could strip off everything 2wd, weld up the holes and then work on mounting a modern suspension. I'm thinking longer leaf springs front and rear, while using modern design mounting shackles.
The shocks; you could look to companies like Fox or King to get the ultimate system. These systems I have seen adapted to old truck frame/axles required all new mounting points in different locations.

The steering box mounts the same, and you will need 4x4 cross members, exhaust manifold (Vintage OE) dump straight down on 4x4, and are angled back on 2wd, body wise a high hump trans cover (even though I have seen low hump used).
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Old 11-06-2013, 02:21 AM   #6
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Re: 4X4 68 - 72 Suburban Frames

Thanks for the info. There is no real problem with the 4WD frame it is just that the 2WD frame is so pristine. I guess I am back to doing a body swap now. Gotta get some pictures of this project posted.

Paul
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1969 Mercury Cougar Standard 4 speed
1969 Mercury Cougar XR7 convertible
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Old 11-07-2013, 10:17 AM   #7
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Re: 4X4 68 - 72 Suburban Frames

My father in law swapped a suburban body onto his 70 K20 pickup frame probably about 30 years ago. From what I remember him saying he did the swap in about a weekend. I think he said he had to add about 8-9" of framerail to the end of the pickup frame. He's since swapped the pickup back onto the original 4WD frame.
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Old 11-07-2013, 03:07 PM   #8
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Re: 4X4 68 - 72 Suburban Frames

This project is going to take on a life of its own. Since the 2WD Suburban frame is different from the 4WD Suburban frame I will be swapping bodies not drive train. It is going to take some work to get the 4WD frame nice enough before putting on the "new" body on. It will need sandblasting, new brake lines, painting and new body supports.


Is there any market for the 2WD frame and drive train? It is a 6 cylinder 4 speed with a posi rear.

Paul
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1969 Mercury Cougar Standard 4 speed
1969 Mercury Cougar XR7 convertible
1970 4WD Chevrolet Suburban
1968 2WD GMC Suburban
1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)
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Old 03-07-2014, 04:59 AM   #9
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Re: 4X4 68 - 72 Suburban Frames

hi i was wondering if you can help me, is there anyway you can lift a 1968 2wd suburban. most people ive asked have said no, i would like to keep it 2wd and lift it a couple inches. but if not i know i would have to end up modifying it into a 4wd right?
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Old 03-19-2014, 06:32 AM   #10
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Re: 4X4 68 - 72 Suburban Frames

You need lift spindles for the front. Just like lowering the truck would require drop spindles.
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Old 03-19-2014, 03:03 PM   #11
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Re: 4X4 68 - 72 Suburban Frames

thank you, that was really helpful i appreciate it!
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Old 06-05-2016, 07:38 PM   #12
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Re: 4X4 68 - 72 Suburban Frames

Ok I mite be able to add to this. Front hangers from diy work awesome, yes you have to take front engine Cross member out as its all connected with like 12 or so bolts. The back is way different. But has the same contour. I did a order shackle flip in back with custion rear front hangers. Lol] But if you have a go fab guy close he can figure it out . I changed my 2 wheel burb to 4. 1 ton axle under it took 3 days. I have the tcase tranny a ls3 going in shortly
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Old 06-05-2016, 07:41 PM   #13
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Re: 4X4 68 - 72 Suburban Frames

The parts. I let the 2 wheel drive steer box on my did Cross over steering Cuz it's way better anyways.if you have rt knuckle an arm
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Old 06-05-2016, 07:43 PM   #14
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Re: 4X4 68 - 72 Suburban Frames

And after the 3 days
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Old 06-05-2016, 07:49 PM   #15
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Re: 4X4 68 - 72 Suburban Frames

Holy FAT Mickey T's!!! lol
Looks good man , great work!
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Old 06-16-2016, 08:22 PM   #16
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Re: 4X4 68 - 72 Suburban Frames

Quote:
Originally Posted by Captainab View Post
Ok I mite be able to add to this. Front hangers from diy work awesome, yes you have to take front engine Cross member out as its all connected with like 12 or so bolts. The back is way different. But has the same contour. I did a order shackle flip in back with custion rear front hangers. Lol] But if you have a go fab guy close he can figure it out . I changed my 2 wheel burb to 4. 1 ton axle under it took 3 days. I have the tcase tranny a ls3 going in shortly
You had a trailing arm suspension for the 2wd and used that frame for the 4wd?
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Old 09-17-2016, 02:57 AM   #17
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Re: 4X4 68 - 72 Suburban Frames

Quote:
Originally Posted by Captainab View Post
Ok I mite be able to add to this. Front hangers from diy work awesome, yes you have to take front engine Cross member out as its all connected with like 12 or so bolts. The back is way different. But has the same contour. I did a order shackle flip in back with custion rear front hangers. Lol] But if you have a go fab guy close he can figure it out . I changed my 2 wheel burb to 4. 1 ton axle under it took 3 days. I have the tcase tranny a ls3 going in shortly

Currently doing exact same thing to mine, but a cummins/5spd/205.....can you message me any measurements for placing the diffs in the proper spot? I can figure it out for sure, but just thought I would get more input from you.

Sorry for highjacking.....
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Old 08-28-2017, 08:29 AM   #18
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Re: 4X4 68 - 72 Suburban Frames

Yes 2 wheel drive frame that is now 4 wheel drive, I did add 2 cross member and some plates on the frame , and filled in some holes where brake cables ran threw. Precision fab work guided my and I trust what he says will work and not.he also won't let me miss any of the process. If I try an skip or do something to make easier on my he makes me redo it. No cutting corners on his watch. It's going good so far motor tranny tcase all is and looking as good as powder will let it look,
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Old 08-28-2017, 08:33 AM   #19
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Re: 4X4 68 - 72 Suburban Frames

What ya think so far.
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Old 08-28-2017, 08:40 AM   #20
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Re: 4X4 68 - 72 Suburban Frames

Few more pictures. As of now all fuel lines are run brake lines gonna run my fuel sender wire and fuel pump wires. The chassis will be done till I get body back
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Old 08-28-2017, 08:42 AM   #21
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Re: 4X4 68 - 72 Suburban Frames

1 more
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Old 08-28-2017, 08:51 AM   #22
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Re: 4X4 68 - 72 Suburban Frames

Last1
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Old 08-28-2017, 08:55 AM   #23
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Re: 4X4 68 - 72 Suburban Frames

Yes I know it's a car but these are the colors I picked for my burb. Split almost the same way but of course on a suburban
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Old 08-28-2017, 08:02 PM   #24
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Re: 4X4 68 - 72 Suburban Frames

Wow. Looks incredible
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Old Today, 09:27 AM   #25
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Re: 4X4 68 - 72 Suburban Frames

Why thank you. I don't work on it a lot. I wait till I get a lot of parts and spend 10 to 12 hours there. Then wait for more parts. The burb is at Percision fab works and is roughly 60 miles from me. So far chassis is ready for body just waiting for body to be ready and set back on. Just found 3rd door and 2 good barn doors in Ca that are very useable with little work to be done to them before paint. I am guessing I won't have body till April since I will be to busy to go get. And then it's on from there. I will have it for holleys Ls fest 2018. And as long as my schedule don't interfere I'll be there.
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