New Square Jimmy owner, starts with the floors

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K5square

Junior Member
Joined
May 18, 2026
Posts
7
Reaction score
7
Location
Maine
First Name
KAD
Truck Year
88
Truck Model
K5
Engine Size
350ci
Hi,

Joined up to educate myself on Square Blazers.
Picked up a 88' K5 for my son and I to work on. Frame is real nice, body/tub is very bad in the floors.
Was surprised to see NO 1-pc Full Floor Front Sections available for sale aftermarket.
Got to looking at the single new floor pans patch panels included and how the factory designed the floors. I am decided to Fab floors out of steel diamond plate.

The goal for this truck is to be a tough working truck, trail rig, for months there is no salt down.
I am not going to replace floor w "thin" weak sheet metal of factory design. I seen a nice pic of a guy who did diamond plate it looks good.

Seeing how my cab/body is essentially "floor-less" I need to rebuild B-Pillar and tie "hoop" back together.
Once I have the *** B-Pillar rebuilt, I can figure out what to use for the floor support/cross brace *****. The factory part is quite rusty and definitely bent from body sag.

These guys that off-road these hard must use an alternative part in this location???

Could you guys please send me in the direction I need to go to research HD floor pan and B-Pillar Hoop work.

Then I could get the B pillar mounts hooked up and some front brakes plumbed. Steering shaft connected. Rolling stopping project. I really want to get to that point ASAP.
A loose and sagged out body on the frame is no fun!
 

WFO

Full Access Member
Joined
Jan 6, 2017
Posts
4,355
Reaction score
6,506
Location
Texas Panhandle
First Name
Dan
Truck Year
1986
Truck Model
K20
Engine Size
350
Welcome from the Texas Panhandle.
 

ali_c20

Supporting Member
Supporting Member
Joined
Sep 20, 2016
Posts
2,087
Reaction score
3,203
Location
Austria
First Name
Alexander
Truck Year
1974, 1979
Truck Model
C20, K5
Engine Size
350, 350
Welcome from Austria. Lots of work ahead
Search for K5 diamond plate floor pan, some results pop up.
.
You must be registered for see images attach

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Last edited:

legopnuematic

Licensed Junk Dealer
Supporting Member
Joined
Oct 27, 2016
Posts
5,141
Reaction score
19,128
Location
MO
First Name
Spencer
Truck Year
1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
Truck Model
Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
Engine Size
225/6, 350 c.i., 350 c.i., 5.9l Cummins
Welcome from Missouri.
 

animal

Super Moderator
Staff member
Moderator
Joined
Jul 30, 2010
Posts
5,944
Reaction score
4,476
Location
Georgia
First Name
Lee
Truck Year
1986
Truck Model
c10 silverado
Engine Size
350ish
:welcome:
 

Steelbuddha

Full Access Member
Firefighter
Joined
Mar 16, 2024
Posts
132
Reaction score
200
Location
Central North Carolina
First Name
Jonathan
Truck Year
1984
Truck Model
K20 (dump bed)
Engine Size
350
Another howdy from North Carolina!

Reminds me of the first project car I ever got (1977). 1965 Ford Falcon. There were pieces of plywood in the floorpans, where there was no metal. Replaced everything with diamond plate (very crudely). Learned a lot that summer. Bought the car for $45, sold it for $300. It was when I learned that restoring vehicles makes no economic sense. Didn't make me stop doing it, though. :p
 

JamesSam

Full Access Member
Joined
Feb 15, 2023
Posts
2,599
Reaction score
7,886
Location
VA
First Name
Sam
Truck Year
1987
Truck Model
Silverado V10
Engine Size
5.7 L 350 v8
Welcome from VA.
 

86 SCOTTSDALE

Full Access Member
Air Force
Joined
Apr 10, 2019
Posts
368
Reaction score
318
Location
Oakham MA
First Name
Armand
Truck Year
1986
Truck Model
K10
Engine Size
305
Welcome from MA. Good luck. Had a similar situation on my 83 K5 but she's solid as a rock now.
 

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peats

Full Access Member
Joined
Dec 2, 2016
Posts
390
Reaction score
413
Location
Pennsylvania
First Name
john
Truck Year
72k5, 81c10 short step, 83k10 short fleet, 03 SSR. 25 chevy doodlebug
Truck Model
k5 c10 k10 SSR doodlebug
Engine Size
406 360 6.2 5.3 171
You're going to spend a lot of money and brainpower on something that needs to be up to original GM specs only. IMHO.
 

K5square

Junior Member
Joined
May 18, 2026
Posts
7
Reaction score
7
Location
Maine
First Name
KAD
Truck Year
88
Truck Model
K5
Engine Size
350ci
Welcome from Austria. Lots of work ahead
Search for K5 diamond plate floor pan, some results pop up.
.
You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach
I'd like to see more of this build
Is he a member?
 

ali_c20

Supporting Member
Supporting Member
Joined
Sep 20, 2016
Posts
2,087
Reaction score
3,203
Location
Austria
First Name
Alexander
Truck Year
1974, 1979
Truck Model
C20, K5
Engine Size
350, 350

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