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Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1246621 Tue Dec 12 2017 01:02 PM
Joined: Jun 2016
Posts: 204
O
oldieoldie Offline OP
Shop Shark
I guess for the expense itprobably isn't worth it. I am on a seriously short budget and I don't need much speed for around here. I was just thinking about making it to the rally next year it would be nice to be able to "highway speeds". Actually, at this point I don't even know what she will do. I've a few people tell me thay have driven a 6400 in the past and it topped out about 40. This week a friend said they traded theirs off a few years ago and had no problem at 55. So I guess I should just wait and see.


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1246627 Tue Dec 12 2017 02:51 PM
Joined: Sep 2010
Posts: 1,520
W
Wayne67vert Offline
Shop Shark
The reunion has a slowest speed contest. Leave it as it is, you might be able to win it. smile


Wayne

When I die, I hope she doesn't sell everything for what I told her I paid for it!

1938 1-Ton Farm Truck
In the Stovebolt Gallery
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post. malmwayne@hotmail.com
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1246662 Tue Dec 12 2017 07:59 PM
Joined: Dec 2012
Posts: 208
E
Ed Hotaling Offline
Shop Shark
I have a '46 Chevy 6400. When I got it , the original 235 had no governor and it would occasionally get the speedometer up to 60. A year later, I was replacing the engine (chewed-up crank) with a '53 factory replacement that had the governor in place. It will get the speedometer up to 50, my wife was following me once in her car and said I was doing 54. That's as fast as I would want to go in the old beast and I'm not sure if I would want to hold it there for a long period of time.

Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1246960 Fri Dec 15 2017 03:05 AM
Joined: Jun 2016
Posts: 204
O
oldieoldie Offline OP
Shop Shark
Guess I should just see what I get and go from there.


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1246988 Fri Dec 15 2017 03:08 PM
Joined: Jan 2015
Posts: 1,036
3
32vld Offline
Shop Shark
I am surprised I missed this thread.

My son has a 1946 2 ton. With the original 235 and the throttle plates
removed from the governor, I rebuilt the carburetor, new plugs, wires,
cap, rotor points condenser, timed to factory spec, he hit 53 on a level
section of the interstate for a brief moment with an empty bed.

He normally drove the truck at 42 - 43 and would stay from 40 to 45
range. He used the truck the first fall for his catering business. Then a
few times a week the following spring from last week of April till the
first or second week in June and the number 6 cylinder dropped a valve.

When I took the head off I found a cylinder toward the front of the engine
had a burnt valve. Not bad hitting 53 mph with a tired old motor.

Anyway my son went with a 1954 235 for 19 more HP and 8 lb torque.
He hit 47 briefly returning from a catering event this past summer.

Though he has not and will not try to see what the 54 engine can do
with the truck unloaded for he does not want to risk damage.
Jeffrey

Last edited by 32vld; Sat Dec 16 2017 01:38 PM.
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1247015 Fri Dec 15 2017 08:01 PM
Joined: Sep 2001
Posts: 29,267
tclederman Offline
Boltergeist
32vid,

Thanks for the report. Congratulations to your son and to you.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1249253 Tue Jan 02 2018 10:54 PM
Joined: Aug 2016
Posts: 34
R
Rich 1952 Offline
Wrench Fetcher
I JUST FINISHED MY STOCK 52' 4400. NEW TIRES, BRAKES. THE STEERING IS TIGHT AND THE TRUCK HAS 23000 ORIGINAL MILES. I TOOK IT TO 52 MPH ON A FLAT PAVED ROAD. IN A NUT SHELL, WEAR DEPENDS. HIT A BUMP AND ITS A ROLL OF THE DICE FOR CONTROL. UNDER 40 MPH VERY MANAGEABLE. MY BRAKES ARE CONVERTED TO VACUUM ASSIST AND ARE VERY RELIABLE. EVEN THO THE SWAY AND ROLL IS SCARY. I RECOMMEND PUT A STOVEBOLT CAB ON A S10 OR MOTORHOME FRAME AND SUSPENSION.

Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1249258 Tue Jan 02 2018 11:23 PM
Joined: Jun 2016
Posts: 204
O
oldieoldie Offline OP
Shop Shark
I want to use it to carry big loads, so I guess I'll just keep the speed down. At 40 mph I am not driving it to the rally, so I guess I better work on my other truck.


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: Highway Speeds in a 2 ton? [Re: oldieoldie] #1250348 Wed Jan 10 2018 06:39 PM
Joined: Jul 2014
Posts: 16
B
bptweed Offline
New Guy
I just got my 1948 6400up and running with the 2 speed rear end functional. 13' grain bed dump. I took the sides off and am currently driving as a flat bed.
i put 9.0x20s on the back with the rear end in low until last weekend.
So if i am not mistaken low is 8.10 and high is 6.13. I have a freshly rebuilt 261 and sm420.
I ran the numbers on a speed calculator considering the 39 inch diameter rear wheels.
http://www.csgnetwork.com/rearendgearcalc.html
My speedo jumps around quite a bit and doesn't work in low so I have used the WAZE gps speedometer on my phone. To my surprise my calculated speeds match up with the GPS. here are my mph calcs in 4th gear 1.1 that i have found to be accurate.
rpm low hi
2000 28 38
2500 36 47
3000 43 57
3250 46 61

I can tell you that 45mph feels good. It steers nice with the 9.0x20 highway tires on the fronts. the rears are agricultural traction tires that make some noise but feel great also. 55mph on the two lane highway is ok. The hydrovac brake booster works and provides plenty of stopping power.
Remember that these 6400 do not have shocks just leaf springs so there is some bouncing goin on when empty over expansion joints, dips and such.

Just my 2 cents. Have fun, I really enjoy mine.



Re: Highway Speeds in a 2 ton? [Re: bptweed] #1250349 Wed Jan 10 2018 06:43 PM
Joined: Jul 2014
Posts: 16
B
bptweed Offline
New Guy
sorry. i forgot to add that the two speed rear end is functional since last weekend so i have finally been able to run around in 4th high and achieve the mph numbers i shared above.

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