Author Topic: 77 crew cab 2wd to 4wd  (Read 10334 times)

Offline Oldsmolet

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77 crew cab 2wd to 4wd
« on: June 11, 2015, 12:54:39 AM »
Well my 77 crew cab arrived from Texas finally so I figured I'd start a build thread for all the people asking about 2wd to 4wd swaps.   Seems lots say it's easier to swap cabs or its not possible. One person keeps spewing this with zero experience and detouring people from trying.  I have an 85 crew cab that was converted.  They did a hack job and cab was super rusty. I just used it as a mud beater and decided to redo it cause I've always wanted a nice crew cab.  Here's a picture of it.
photobucket.com/user/oldsmolet/media/Mobile%20Uploads/image.jpg.html][/URL]

It needed floors, cab corners, rockers, pretty much everything to shorten the list.  I found a 77 crew cab in Texas to rob the cab and bed to save time.

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #1 on: June 11, 2015, 01:04:54 AM »
So the 77 arrived today. It is super solid no rust except a hole in one fender.  Complete no pieces missing. Never been messed with except a small collision in frony they put later model grille and stuff in it. Since I have to swap fix and mend most the suspension and mounts on the other truck I've decided I'm just going to convert this one to 4wd. 
Hopefully document it well to show people what it really involves swapping these trucks over.
Plans are 73-74 grille, 8 inches of lift, 37" tires, green and white paint, and all new interior. 
This will probably take a while but hopefully ill have the suspension and swap stuff changed in the next couple weeks.
What is involved...
Rear springs I'm using an ORD shackle flip and the front rear hanger must be changed to 4wd. They hang lower than 2wd.

Front end. Cut out all the 2wd steering and engine cross member. It's riveted in. Replace crossmember with 4wd one.

Front springs core support mounts 4wd have front hanger built in. Drill holes and mount rear shackles.

Steering. Get a 4wd steering box and steering linkages.

Changing trans and transfer case obviously.  Drill holes for new cross member

Trans tunnel.  Either body lift or I have a bolt in tunnel so believe I'm going to replace.

Shafts and small stuff that's about it.  Time consuming because of all the rivets but not bad.

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #2 on: June 11, 2015, 01:13:50 AM »
Here's some photos of what I'm starting with.  I love solid unmolested trucks! 
Plans for this weekend are remove bed, install hangers and springs for rear, paint rear frame and underside of bed with chassis saver.
Well here she is.
com/user/oldsmolet/media/Mobile%20Uploads/image_1.jpg.html][/URL]

com/user/oldsmolet/media/Mobile%20Uploads/image_2.jpg.html][/URL]

Offline illinoisk30

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Re: 77 crew cab 2wd to 4wd
« Reply #3 on: June 11, 2015, 04:35:07 AM »
Welcome from Northern Illinois. What a great truck to start with, love those western trucks. I am anxious to see how this build turns out. You could leave the 2wd steering box and go with crossover steering.
1977 Chevy K10 LWB Supercharged 406 TH350
1977 Chevy K30 DRW 400 TH400
1978 GMC K35 SRW 454 TH400
1979 GMC K35 SRW 400 TH400
1980 Chevy K30 SRW 350 SM465

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #4 on: June 11, 2015, 06:24:22 PM »
Yeah I thought about that but I have a new 4wd steering box and all the parts

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #5 on: June 13, 2015, 06:30:04 AM »
Well it rained on and off on me all day and I can't get in the garage so it was hit or miss and I had to wait on friends to help lift the bed.  I will say this.  Texas trucks are awesome! I took leaf springs and bed bolts and everything out with a 3/8 drive ratchet! Here's some photos. Not very exciting yet. More today.





I noticed this truck had 56" springs too so I have to move the rear bracket forward for the 52" springs.  GM already drilled the holes for you though ;)

« Last Edit: June 16, 2015, 10:20:12 AM by Irish_Alley »

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #6 on: June 16, 2015, 11:04:22 PM »
Well I ran into problems but we are working through them. Busy back at work too till the weekend.  My truck is actually a 1 ton.  Who knew. C20 badges and title says 3/4 ton.  So all my brackets are 3/4 ton now but as most of you know the spring perches are narrower on a 1 ton.  So I have a 3/4 ton 14 bolt FF that I'm just going to put in rather than move the perches.  Get that in then time to tackle the front

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #7 on: August 05, 2015, 02:02:40 AM »
Well doesnt seem to be a lot of interest in step by steps so I stopped but figured I'd at least show an update.  Hopefully get engine and trans in soon.

Offline Dr_Snooz

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Re: 77 crew cab 2wd to 4wd
« Reply #8 on: August 05, 2015, 09:35:19 PM »
Nope. I'm very interested in step-by-step. I am planning to convert my crew someday too. Have fun with the build.
1986 GMC C-2500 Crew Cab, 7.4L, TH400 -- RIP Chester

1989 Chevy Suburban V-2500, 5.7L, TH400

1990 Chevy C-3500 Ext. Cab, 7.4L, 3L80

Offline Oldsmolet

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Re: 77 crew cab 2wd to 4wd
« Reply #9 on: August 06, 2015, 01:55:19 AM »
Well I have taken pictures most the way I may just compile them all one night.

Offline zieg85

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Re: 77 crew cab 2wd to 4wd
« Reply #10 on: August 06, 2015, 08:45:06 AM »
Well I have taken pictures most the way I may just compile them all one night.
Please do
1985 C30 Custom Deluxe Ext. cab 5.7L TH400 3.21 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline Irish_Alley

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Re: 77 crew cab 2wd to 4wd
« Reply #11 on: August 06, 2015, 03:20:14 PM »
Well I have taken pictures most the way I may just compile them all one night.
Please do

yup
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Dr_Snooz

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Re: 77 crew cab 2wd to 4wd
« Reply #12 on: August 06, 2015, 10:18:31 PM »
x3!
1986 GMC C-2500 Crew Cab, 7.4L, TH400 -- RIP Chester

1989 Chevy Suburban V-2500, 5.7L, TH400

1990 Chevy C-3500 Ext. Cab, 7.4L, 3L80

Offline moss5472

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Re: 77 crew cab 2wd to 4wd
« Reply #13 on: November 13, 2016, 06:22:49 AM »
Well I have taken pictures most the way I may just compile them all one night.
Made any more progress? Im also interested in what it takes to 4x4 swap a c20 crew cab.
84 k20 454 TH400
02 Dodge 2500 24v

Offline CJGuy

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Re: 77 crew cab 2wd to 4wd
« Reply #14 on: August 22, 2017, 11:12:40 AM »
I converted my '80 2wheel drove to 4 by a few years back, I wouldn't want to do another one. But the two wheel drive trucks are so much cheaper and usually much cheaper...  will be watching!


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