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Old 05-29-2017, 10:40 AM   #1 (permalink)
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720 Dilemma

I've been trying to figure out what to do with my '81 720 KC. It has been non-op for a long time. I also have a '78 GMC K15 that has more rust than not but has a decent drivetrain. I was going to buy a cab for the K15 and rebuild the truck but I can't afford to build two trucks and I would rather not get rid of the 720.

I would like to combine the two trucks and I'm trying to decide if it would be better to strip the K15 and put everything into the 720 or pull the 720 body and put it on the K15 chassis.


The truck will be use mostly for light trails and camping and I don't want to run anything larger than a 35" tire. I know that I'll have to build some kind of flares for the truck to stay legal and I will probably got with some kind of flatbed with boxes.

Any help will be greatly appreciated. Thanks.
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Old 06-02-2017, 07:42 PM   #2 (permalink)
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Unfortunately, the chevy front axle is a passenger side drop, leaving you with really 3 options.

1) Swap the entire drivetrain of the chev into the nissan chassis, which is probably what I would do and make for a smaller and more capable trail rig; however that's a lengthy build.

2) swap the 720 body on the rusty chev frame, probably will have a lot of issues because of the width of the chevy frame vs the small cab of the 720.

3) Find a driver side drop Ford or FSJ dana 44, swap the chev knuckles/brakes onto it, and stuff that running gear into the 720. This way you can use the Nissan motor/trans/transfer case with the ford front and chev rear axle, saving a lot of work and time on your build.
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Last edited by synbiotic12; 06-02-2017 at 07:43 PM.
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Old 06-05-2017, 02:17 PM   #3 (permalink)
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What the last poster forgets is that 720s use a different Tcase than D21s and D22s with a CENTERED front output, so an axle with either a passenger or driver drop is going to be offset to one side, and you'll have some wonky driveline angles

X2 with the full drivetrain swap, but no idea how well the 720 body fits on a squarebody frame.....that, and squarebody frames leave much to be desired.
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Old 06-05-2017, 08:28 PM   #4 (permalink)
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Quote:
Originally Posted by D-RAT View Post
What the last poster forgets is that 720s use a different Tcase than D21s and D22s with a CENTERED front output, so an axle with either a passenger or driver drop is going to be offset to one side, and you'll have some wonky driveline angles

X2 with the full drivetrain swap, but no idea how well the 720 body fits on a squarebody frame.....that, and squarebody frames leave much to be desired.
I didn't know that D-rat, I guess I just assumed it was the same side drop. That just makes it easier to decide on choice number 1
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Old 06-14-2017, 12:10 PM   #5 (permalink)
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Just got done swapping a 4.8/4l60e into my brother's 85' 720 KC. we ended up using an S10 NP231 transfer case and a Wagoneer D44 front axle, cutting all the independent bracketry off the frame, and building a leaf setup using the Wagoneer leafs
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Old 06-18-2017, 09:25 AM   #6 (permalink)
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I've been going over this for a while now and I think I'm just going to unload the K15 and use the money for the 720. I decided to keep the IFS for now and run a V6 with an automatic.

I have a Buick 231 V6 that I would like to build but I've heard that they aren't very dependable and everyone advises me to use a 4.3 instead. I live in a rural area in Illinois and parts are hard to find here. When you do find them; people want an arm and a leg for most things. It will set me back anywhere for $300 to $600 for 4.3 that I would have to rebuild anyway. I already have pistons and a Performer intake for the 231 and I like the simplicity of the engine. I don't nee the truck to be fast; I just need something that will get me to some good camp spots and get me home again.
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