Top Speed

[Ethan Keuning]

Okay, I know that its shaped like a brick, its not meant to go fast, but how fast have you guys been able get going in your square?

 

[donnieray]

I have a mechanically sound 86 C10 that I've had slightly over 100mph several times. I'll cruise my 84 K10 on I-95 at whatever speed traffic is moving. 85 mph for hours at the time. My trucks are solid and well maintained though. I've rode in shitbox squares that dont feel safe at any speed.

 

[Frankenchevy]

One thread about mpg and one about top speed. I remember being 16!

With anything near stock suspension and brakes and being 16 in a 34 year old vehicle that isn’t exactly safe by today’s standards—I would not be trying to max it out.

 

[Rob Goblin]

85ish on the freeway but not through mountain passes. I’m too old for driving a square like I’m a nascar driver lol

 

[Grit dog]

Okay, I know that its shaped like a brick, its not meant to go fast, but how fast have you guys been able get going in your square?

Far too many factors and options to even begin to answer. Yes the question presumably shows you're about 16 years old givertake a year or 2.
My answer is if you want to go fast, first concentrate on making the truck quick, and safe.

But a direct answer is, I recall road trips as a kid, doing 80mph for hours on end in a '74 C20 or '85 C10. Same with my old 1980 plow Blazer in 1990 ish.
Current truck on 35s and 4.10s is stable at 70mph and even 80 mph, but she's already running 3k rpms at 70, so going fast is an effort in financial futility, whereas a C10 with the right gears and in good shape would hold 100 all day (except for the pit stops every 90 min for gas!).

 

[Blue Ox]

How Fast Can A Squarebody Go? | GM Square Body - 1973 - 1987 GM Truck Forum