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1987 V20 Suburban 350TBI/SM465

fordmas

Partially sentient meat based robot
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May 7, 2021
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Location
Austin, TX
Well y'all, I did it. I jumped back in to the square body family. Picking up this beautiful stock 1987 V20 Suburban tomorrow in OK and driving her back to Austin. Nice clean slate, SM465, and 65,000 original miles. Really looking forward to this project :D


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This thing is going to be a general purpose rig. I've got a small farm so I need something I can carry crap around it or pull a small trailer as needed. This will also be our family adventure truck for camping and the like. And I want to be able to do some trails and offroading, but nothing super crazy.

Suspension
4 or 6 inch lift. Not 100% brand but TC seems to be the favorite these days. Lots of reading point to them being the nicest ride outside of customer spring packs. Since I'll be doing plenty of highway miles, that seems like a good bet. Also looking at ORDs Xtreme rear shackles, zero rates to move the axles a bit. I don't need anything wild, just want a good ride and enough flex to get around.

Tires
Haven't decided anything on wheels but for tires I'm thinking 35s or 37s, depending on where I land with the suspension. I'd prefer to not cut the body this time around. Looking for a good multi purpose tire. I don't mind a little road noise to get a tire that will do well in some mud and trails. Looking at Maxxis, MTs, and BFGs at the moment.

Driveline
1 tons are always on the mind but I don't know if I will really need them. I won't be going larger than 37s and no crazy rock crawling. I will have some added weight from bumpers, gears, and bodies but I'm still thinking on this one. Plus I'm thinking about air lockers and at that point I might as well go with 1 tons. I'm not sure if this has an NP208 or 241 but would probably change that out for a 205 at some point. Also like to convert the rear to disc brakes. I would like the truck to be as tough as financially possible...hate to break something while camping with the family.

Body
I like the low profile of the stock bumpers but I'm thinking I will swap them out. Something not too large and in the way...just enough space to mount a winch and some lights and protect the front. On the rear, I want to do a swing out tire carrier and maybe have a spot for a gas can or two. I'm on the fence about a roof rack. I think they are really hit or miss on these old suburban. Some just look like luke warm dog shit. I did see a thread on here a little while ago about a guy who made his own and it turned out quite well. Might need one, might not. I guess it depends on the kind of trip I want to take and if I want to sleep in the back or out in a tent and where I want to pack the gear. Plan on one of those flexible hood mount solar setups to keep batteries up and not have to worry about any extended radio or camping fridge or camping light usage. Thinking LED light replacements and put in some trail lights and general work/campsite lighting as well.

Engine
Not sure on this one. I've never had a 350 before. Last suburban was the 6.2. Maybe just a better intake. Maybe more.

Interior
Swap the front bench for buckets and build a center console. Clean up the dash a bit, sound dampening everything, add a radio and speakers, ham radio setup somewhere out of the way, run some LED lighting inside for night time campsite usage. Thinking about a slide out cargo carrier but weighing this vs having the option of a removable sleeping area in the back. Might fab up something where I can drop in a bed platform over the cargo slider. Still need to use this for carrying things around.

Thats all my sleep deprived brain can come up with right now. And plans always change :D
 
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Nice! What plans do you have for it?
Right! Forgot that bit. Its almost a shame to do anything to it...how often you find one of these in such a good stock condition. I've edited the original post to include an answer.
 
to me; tires, axles and lift all kind of come down to one thing, what gears do the axles have and are you planning on regearing?
I would think the axles under it would be fine for what you want to do; @Bent77 comes to mind as he is running a 14SF with no problems on 37s.
an 87 should have a 208
 
Maaaaaannnnnn a 4x4 manual trans fuel injected barn door burb. Cream of the crop right there.
Yeah you said it! I almost couldn't believe it when I found it.

to me; tires, axles and lift all kind of come down to one thing, what gears do the axles have and are you planning on regearing?
I would think the axles under it would be fine for what you want to do; @Bent77 comes to mind as he is running a 14SF with no problems on 37s.
an 87 should have a 208
Great point Jeff. I don't know what gears are in it. My last K20 had 4.10 with 35s and later 38s and it was pretty sluggish. I doubt it has anything helpful for 35s or larger. I'd have go with 4.56 or 4.88.

That’s clean! How’s the interior?
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Nice burb. I have an '89 with the SM465 and barn doors. Love it. It has the NP241 which has a better low range than the NP205. If you are not going crawling all the time you might just want to keep it. This configuration with the bench seats, manual, 3/4 ton and barn doors was often an institutional or government order. Mine was a university research rig. Any idea who ordered yours?
 
Not specifically but it came from a school district in western Colorado
 
Great point Jeff. I don't know what gears are in it. My last K20 had 4.10 with 35s and later 38s and it was pretty sluggish. I doubt it has anything helpful for 35s or larger. I'd have go with 4.56 or 4.88.

what transmission did your K20 have?
 
T400

1st
2nd3rd
2.481.481.00

SM465

1st
2nd3rd4th
6.553.581.571.00

the 465 has a lower first gear and second gear than the 400; that should help you get going better than the auto. I have an 84 K20 that I plan on running a 465 with 4.10s in the axles with 37s.
 
If you decide on a cargo slider, are you going to build your own or purchase something pre made?
 
T400

1st
2nd3rd
2.481.481.00

SM465

1st
2nd3rd4th
6.553.581.571.00

the 465 has a lower first gear and second gear than the 400; that should help you get going better than the auto. I have an 84 K20 that I plan on running a 465 with 4.10s in the axles with 37s.
This is great info. You have the stock axles or 1 tons?

If you decide on a cargo slider, are you going to build your own or purchase something pre made?
I’m going to try my hand at my own first. It’s been quite a while since I’ve welded anything more than hog traps so we’ll see how that goes. Hoping to make as much as I can but I know my limits.
 
This is great info. You have the stock axles or 1 tons?


I’m going to try my hand at my own first. It’s been quite a while since I’ve welded anything more than hog traps so we’ll see how that goes. Hoping to make as much as I can but I know my limits.
I've seen some pretty sweet overland style slide outs. I think there is quite a bit of support for those kinds if storage devices these days. You shouldn't have too hard a time finding good sliders and hardware and whatnot.
 
That’s the hope. I’ve seen lots of them on different rigs. I’ll see how I end up using mine and build the slider to suit my needs
 
@Bent77 what are the specs on your 37s? What size lift?

Two of my tires are already pretty low so I'm thinking I'm going to do lift and tires first
 

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