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Old 08-19-2002, 11:21 PM   #1
Looksback
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1974 Chevrolet Custom C20, 4WD Conversion?

I have three auto's two are K5 Blazers, and one '74 3/4 ton 2WD truck. Can a conversion from 2WD to 4WD be done, or even better AWD "All-Wheel Drive", the truck is beatin up but all stock, even still has the O.E. 292 6 cylinder motor!, TH350 automatic transmission, & 4.10:1 rear end.
So what I would like to know is can it be done and what is involved?

Thanks for the time [image]http://www.geocities.com/looksback/ChevroletA[/image]
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Old 08-20-2002, 06:46 AM   #2
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

By far if you are asking this question based on experience find a 4wd frame and swap the body over. There is nothing simplistic about adding a front axle to a 2wd frame. If you want AWD they made full time 4wd transfer cases in the pre 80 era. Look for something around 73-77 preferably this will have the NP203 full time transfer case. Granted you could swap it onto a 87 3/4 ton 4x4 frame and swap in the NP203...No limits when you are talking about a 73-87 chevy truck.

P.S. another major advantage is you keep the samw 2wd 3/4 VIN so your 4WD has the same insurance price as a 2WD
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Old 08-20-2002, 06:58 AM   #3
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

Well it can be done. Have to unbolt the 2wd suspension. Then have to add a 4wd cross member. the easist thing would be to use one of MOR's crossmemebers (see mani ck5 page and check the teh section, steve runs one on his 90). All the holes are in the f`ront. just need to put the 4wd srping hangers on the rear spring hangers would also need to be changed since the 2wd locates the sprig differently. I would do the ORD flip in the back then 4wd front hangers. The rest is installing the case.
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Old 08-20-2002, 12:14 PM   #4
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

Why not just buy another complete running/driving 77 K20 4x4 (350/TH400/NP203 AWD) and skip all the work? There is one I spotted this weekend for $1000 in Grass Valley, OR. I can find you the phone # if interested.

I would think you would spend close to $1000 converting a 2wd over.
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Old 08-20-2002, 12:26 PM   #5
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

cost depends on his tools and abilities,
hobby time is free
if he owns the tools, and a hole saw for the front spring rear shackle is the fanciest tool required, it is easy to do.
the front spring front hanger locates off of the body?rad support mount so that is a no brainer
and if he uses longer front shackles he could correct the shackle angle by placing the FS rear shackle mount in a better location
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Old 08-20-2002, 12:37 PM   #6
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

I was thinking price of parts would be close to $1000

Front axle $250 (dana 44 - 8 lug)
Tranny and T-case $250-400
front and rear drivelines $100-150
Springs $50-250 (depending on if new or used/stock or lifted)

Unless the parts are already laying around...
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Old 08-20-2002, 02:39 PM   #7
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

Don't forget making sure to match the gear ratios in teh axles or buy matching ratio's
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Old 08-20-2002, 03:05 PM   #8
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Re: 1974 Chevrolet Custom C20, 4WD Conversion?

Why do you want a AWD? Just wondering what the advantage would be
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