89 3/4 Ton conversion consideration

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,693
Reaction score
6,875
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
something something rear end changes suburban
I have a rolling 77 K25 frame and a rolling 78 K10 frame if you need pictures of a half ton setup vs 3/4 ton of any kind. I dont know what differences in a burban vs pickup, but very visible and intact... ish. The rear end may have separted from the 3/4 ton and tweaked the frame rails, but all the parks are there.. just strewn out a bit.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,693
Reaction score
6,875
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
There is something I didn't think about, but a friend pointed out, I won't be able to run a 15" wheel anymore with the conversion, will I?
i think 15 doesnt clear the drums on a 14 bolt, or it would have top flush mount on the hub with no backing.. which would be a lot of pressure on a wheel.
 

Arkansas_V8

Proud Redneck
Joined
Jul 1, 2019
Posts
3,022
Reaction score
3,963
Location
Springdale, Arkansas
First Name
Brent
Truck Year
88
Truck Model
V20 Suburban
Engine Size
5.7
There is something I didn't think about, but a friend pointed out, I won't be able to run a 15" wheel anymore with the conversion, will I?

You should be fine. If the back spacing is tight it may require a small amount of grinding.
 

Vbb199

B-rate Hillbilly Customs
Joined
Jan 12, 2018
Posts
9,108
Reaction score
15,456
Location
Salisbury NC
First Name
Vince
Truck Year
89, 79
Truck Model
89 Suburban R1500, 79 C10
Engine Size
350, 502
This is a future project, as you know, I have a s10 to finish...

Thinking on something to do afterwards.
 

Arkansas_V8

Proud Redneck
Joined
Jul 1, 2019
Posts
3,022
Reaction score
3,963
Location
Springdale, Arkansas
First Name
Brent
Truck Year
88
Truck Model
V20 Suburban
Engine Size
5.7
My county has 90,000 people and it takes an hour in either direction of center to get to the next county. I dont know what a big city is lol

I thought of all of y’all as Yankees till I got to know Ted(@78C10BigTen).

I never had a reason to interact with northerners. Glad I did. Some of y’all are pretty darn cool and I would trade some of the yuppies down here for y’all in a heartbeat.
 

Vbb199

B-rate Hillbilly Customs
Joined
Jan 12, 2018
Posts
9,108
Reaction score
15,456
Location
Salisbury NC
First Name
Vince
Truck Year
89, 79
Truck Model
89 Suburban R1500, 79 C10
Engine Size
350, 502
Is there anything different about 3/4 to 1/2 ton steering that I need to know about?
Or can I keep the same pump and box?

Probably would have to change the pitman arm and drag link wouldn't I?
 

Honest Bob

Junior Member
Joined
Feb 23, 2020
Posts
10
Reaction score
13
Location
Easton PA
First Name
Ben
Truck Year
1975
Truck Model
K30
Engine Size
LS 4.8
I would be prepared to replace the metal brake lines in the rear in case you run into trouble getting them off. I know I did!
 

Vbb199

B-rate Hillbilly Customs
Joined
Jan 12, 2018
Posts
9,108
Reaction score
15,456
Location
Salisbury NC
First Name
Vince
Truck Year
89, 79
Truck Model
89 Suburban R1500, 79 C10
Engine Size
350, 502
I would be prepared to replace the metal brake lines in the rear in case you run into trouble getting them off. I know I did!

Yeah, probably not a bad idea.
Like I said, if I was gonna do it, it'd have to be disc rear,
 

TubeTruck

I'm from Boston. Deal with it.
Joined
Sep 4, 2019
Posts
1,439
Reaction score
2,180
Location
East TN
First Name
Denis
Truck Year
1978
Truck Model
Suburban K10
Engine Size
LQ9
These are the ones I made to accommodate my spring assisted shocks. The use the factory mounting locations. The shock bolt goes through my mount, through the factory mount and bolts up as normal. I couldn't use any aftermarket ones as they wouldn't clear the springs.
You must be registered for see images attach

There is something I didn't think about, but a friend pointed out, I won't be able to run a 15" wheel anymore with the conversion, will I?

AFAIK the 15" 8 lug wheels do fit the 14 bolt with the correct backspacing. It's the fronts you have to worry about. I'm not sure on a 2wd but on a 4wd you need to grind the caliper down about 1/2". They have TONS of meat on them so don't worry about going through.
You must be registered for see images attach
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,693
Reaction score
6,875
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
Did you see what I said about pictures
 

Vbb199

B-rate Hillbilly Customs
Joined
Jan 12, 2018
Posts
9,108
Reaction score
15,456
Location
Salisbury NC
First Name
Vince
Truck Year
89, 79
Truck Model
89 Suburban R1500, 79 C10
Engine Size
350, 502
Now if only I could find some sport utility wheels like what's on it, but in 8 lug.

I know they don't exist, but I remember those wheels always being on it.

A bit sentimental, I know.
 

Forum statistics

Threads
44,401
Posts
956,756
Members
36,714
Latest member
MartinK5
Top