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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old February 1st, 2017, 05:45 PM
Cuttyman9 Cuttyman9 is offline
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Default 3/4 ton 2wd to 4x4 swap

Has anyone converted to 4x4 on a 3/4 ton 2wd without switching frames?

I'm hoping to use a later axle (d44) with leafs and all and just making the mounting points match.

I plan to switch to an sm465 with whatever Tcase it comes with.

Any tips from someone who's done it?

Google had mostly frame swaps (which aren't a straight swap)


My truck is a 1966 Chevrolet (I know boo.... no GMC but it's getting a built up gmc v6! So don't worry) C20 long bed.
I have access to an 8 lug front axle and leafs for 175 so I just need steering components, drivelines and small stuff.




Thank you for your input!
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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  #2  
Old February 3rd, 2017, 04:08 AM
bigblockv6 bigblockv6 is online now
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Default Re: 3/4 ton 2wd to 4x4 swap

Early SM465 from 1968-69 came with the Rockwell T221 Transfer Case that was mated directly to the Transmission, later trucks with the SM-465 came with the New Process 205 Transfer Case. On my 68 I actually converted from the Rockwell to the New Process 205
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Old February 3rd, 2017, 04:16 AM
Cuttyman9 Cuttyman9 is offline
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Default Re: 3/4 ton 2wd to 4x4 swap

Good to know! I'm not certain what era trans I'll be buying but hopefully one that either has the T case or matches the 208 or 241 my friend has.
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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Old February 3rd, 2017, 05:41 AM
AZKen AZKen is online now
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Default Re: 3/4 ton 2wd to 4x4 swap

I have done 2wd to 4x4 on 55-59. But that was leaf to leaf. You have coil in front AND rear? ouch!
Lots of things to consider. Obviously the front and read diff ratios have to be the same. A great opportunity to use a 205 and open knuckle. The 205 is the best Xfer case among all the earlier models. No aluminum and no chains. Sounds like a fairly big swap. IMO, it is always better to use the existing frame unless you find an actual donor 4x4 chassis from that era.

Last edited by AZKen; February 3rd, 2017 at 05:51 AM.
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Old February 3rd, 2017, 04:09 PM
Cuttyman9 Cuttyman9 is offline
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Default Re: 3/4 ton 2wd to 4x4 swap

Yeah, I plan to retain the rear coil spring setup and the eaton.

I only have the front to deal with which isn't all that hard as the K member unbolts so it's a matter of lining up the mounting of the leafs and steering.

Did yours just require unbolting the I beam and bolting up the solid axle?
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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Old February 4th, 2017, 06:22 PM
AZKen AZKen is online now
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Default Re: 3/4 ton 2wd to 4x4 swap

On the 56, took off entire front axle and leaf springs and replaced with 4x4 axle and leaf springs/steering/205. Donor had disc brakes and power steering also.

Can't imagine leaving coil on rear. I did a shackle flip on rear to get high and level. I think you are in for a big mess.
My advice: sell your truck and buy a 4x4 or.....buy a 6066 4x4 chassis and sell your chassis. You are headed for a Frankentruck.

Last edited by AZKen; February 4th, 2017 at 06:47 PM.
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  #7  
Old February 5th, 2017, 02:23 AM
1972RedNeck 1972RedNeck is offline
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Default Re: 3/4 ton 2wd to 4x4 swap

I am working on buying a '61 K1500 and a '63 K2500 - both with a 305 and both with rough bodies. I might be willing to part with one of them which would be a great candidate for a body swap...
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Old February 5th, 2017, 04:53 AM
Cuttyman9 Cuttyman9 is offline
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Default Re: 3/4 ton 2wd to 4x4 swap

I appreciate the advice and input but I'm keeping the rear setup. I expected this response but I'm only interested in someone who's done it without switching chassis's or selling the truck.

If anyone's done a 4x4 conversion on a 2wd C20/10 I'm all ears.

Thank you.
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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Old February 5th, 2017, 03:18 PM
1972RedNeck 1972RedNeck is offline
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Default Re: 3/4 ton 2wd to 4x4 swap

Quote:
Originally Posted by Cuttyman9 View Post
I appreciate the advice and input but I'm keeping the rear setup. I expected this response but I'm only interested in someone who's done it without switching chassis's or selling the truck.

If anyone's done a 4x4 conversion on a 2wd C20/10 I'm all ears.

Thank you.
I never have but my brother and I have talked about it a fair bit. While it would be easy to fab a new front crossmemeber to hold the front of the springs (think Ford Highboy) and some shackle mounts in the rear, it will ride more like a Ford Highboy when we get done in the front, and still float in the back.

What I would like to do some year when I get lots of time and money (yeah right), is to take the front suspension/axle out of a late '96 to '99 and fab it under the front of a '60 to '72 GM pickup. This would give a fantastic ride in the front and rear and be quite unique.

For the height problem in the rear, I don't see why it wouldn't be easy to just "flip" the axle to the bottom of the trailing arms for a good 3" - 4" of lift.
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Old February 5th, 2017, 05:11 PM
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Default Re: 3/4 ton 2wd to 4x4 swap

Here's a thread and with information and a link to someone who has done it.

http://www.67-72chevytrucks.com/vboa...d.php?t=727858
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