converting a 2X4 to 4X4
 

i have a 72 C20 with a 402BB. i want to know if i would be able to convert from 2 wheel to 4 wheel on this frame? what all would i need to switch to do so?

sorry im learning

Re: converting a 2X4 to 4X4
 

the front of a 4x4 chassis is different it has leafsprings and other hangers for that .
the thing i would do is find a 4x4 chassis with the axles transfercase and possibly the gearbox/automatic still in and build you 4x2 sheetmetal electrics and motor ontoo that or trade the whole truck in for a 4 x 4 version and safe youreself a LOT of work

there are a couple of threads on the subject theres allso one on http://www.chuckschevytruckpages.com/2wdto4wd.html

Re: converting a 2X4 to 4X4
 

You can but I say dont unless you can fabricate.This isnt a bolt in conversion.Your truck,a 3/4 ton already has leaf springs,correct?If they do thats going to make it a little easier.The frame on the backs are different with coil springs as to a leaf springed truck.The front....thats another story.New motor crossmember(about $50 used) and a transfer case crossmember($50-$100),leaf springs,shock mounts,the axle its self are needed...and everything else,which are not cheap BTW.IMO,your better off buying a 4x4 chassis and put your truck body on if your truck body is good,best option is to buy a 4x4.Also,you will need another transmission and transfer case.They run sorta high also.Plus,4x4s and big blocks dont go together without modifications....Dont even ask about using a newer 4x4 frame,thats as hard as converting this frame:)

Re: converting a 2X4 to 4X4
 

so it can be done with it will cost me. well that fabrication is no problem i can do that.
so i would have to get a front axle and build the suspencion for the front end and put in a new transmission and a transfercase?

Re: converting a 2X4 to 4X4
 

Yep

Re: converting a 2X4 to 4X4
 

as far as having the big block would i have any problems with that?

Re: converting a 2X4 to 4X4
 

I asked the same question not long ago here's the thread with some useful info. My was on 1/2 ton though and there again not sure on the differences.
http://67-72chevytrucks.com/vboard/s...d.php?t=230856

Re: converting a 2X4 to 4X4
 

Here's a link to a frame sire, it may help answer a couple of your question's.
http://www.chuckschevytruckpages.com/framespecs.html

Make no mistake about it, your heading into a buttload of work.

Best of luck.

Re: converting a 2X4 to 4X4
 

so according to the frame chart, the C20 front end should be the same as the K20? everything should mount up with some fabrication and welding...

Re: converting a 2X4 to 4X4
 

Of course they aren't identical but close enough and with a little modification you can make it work.

I didn't move my 350 engine back like the factory did so clearance between the engine and the front differential is tight. With a big block, you might have to raise the front end.

Re: converting a 2X4 to 4X4
 

I got a 2wd made into a 4x4 if you need pictures. I didn't do the change and theres a lot i would of done diffrent. Theres a lot i will change to on it.
Ed

Re: converting a 2X4 to 4X4
 

Yah that would be great if you could post me some pics ED. about how long did it take you to do it?

Re: converting a 2X4 to 4X4
 

He didn't do it. So I think it will be hard for him to tell us how long it took. I'm interested in any pic's you might have also CrashEd RJ22

Re: converting a 2X4 to 4X4
 

Ill get some pictures tomorow.

Re: converting a 2X4 to 4X4
 

I took two weeks off over Christmas/new years to do mine, had to follow up a weekend after that for loose ends. Bought everything from a blazer that was made into 2wd. Lucked out that the front axle had the same gear ratio as my rear.

Re: converting a 2X4 to 4X4
 

well I am in the process of doing the same to my 3/4 ton gmc.I have the frame done and the front installed but right now I am having some probs. with the tranny/transfer cross member. I also added in a 454 tbi out of an 88 and a 6" suspension lift so I am encountering issues all the way around but I just take my time and work through them The frame change wasnt all that bad I think it took me 2 days I will see if can get some pics today for you.

Re: converting a 2X4 to 4X4
 

That would be great. what tranny are you using? i have a turbo 400

Re: converting a 2X4 to 4X4
 

sorry I tried to load some pics but I have to resize them. If you want shoot me your email and I can email them to you. I am also using a t400.

Re: converting a 2X4 to 4X4
 

I'm starting one of these also, but i have a 1974 4x4 donor that I plan to put my 72 cab on. The frame demensions are similar and the cab mount holes are the same the only thing I see that is different is the radiator support brackets. What is so bad about old cab to new frame swap?:confused:

Re: converting a 2X4 to 4X4
 

the frames are longer on the 73-87s by a few inches,from what I heard.The frame is made different making a body lift required when doing the swap.....just a few things

Re: converting a 2X4 to 4X4
 

my e-mail is codymi@hotmail.com