The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
10 members (9% grade, Harold46, JiMerit Boltr#43, Est2rad customs, McMike, 1 invisible), 250 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics120,033
Posts961,335
Members43,542
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
How fast will my truck go?
#1270369 Tue Jun 26 2018 09:57 PM
Joined: Jun 2018
Posts: 33
4
Wrench Fetcher
Im currently bringing a 48 2 ton back to life.
It has the 248 with a 4 speed and two speed rear.
I was just wondering if someone could enlighten me on how fast this truck will go once its up and running. Thanks!


Logan
2010 Silverado 2500HD
1947 GMC 300
Re: How fast will my truck go?
47GinPole #1270380 Tue Jun 26 2018 11:49 PM
Joined: Sep 2001
Posts: 30,152
ace skiver
1948 GMC 350 (2-ton) with SM-420 4speed and 2-speed rear.

Without knowing the gearing on the 2-speed rear, I'll venture a guess of 45 mph comfortably on a straight/level road, and 55 mph would be an exciting ride.

Do you have good tires.
Do you have good brakes (and a good hydrovac), all properly bled and adjusted?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- 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 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: How fast will my truck go?
47GinPole #1270381 Tue Jun 26 2018 11:53 PM
Joined: Jun 2018
Posts: 46
D
Wrench Fetcher
How long will it take to stop is a good question too ;-). I'm hoping for 55-60


Don't tweet, face, Google, or link. Just hanging in as long as I can...
Re: How fast will my truck go?
47GinPole #1270431 Wed Jun 27 2018 01:18 PM
Joined: Nov 2010
Posts: 608
R
Shop Shark
More important is how fast will it stop. Get that in order before anything else. I just sold my 46 2-ton to a guy in Arizona. Tophat is his user name on here. Look him up and if he is close to you, ask for a ride. I updated the front brakes to disc and it will STOP.


Randy Domeck
Indianapolis Fabrications
rdomeck@me.com
Indianapolis, In. 46254
317-258-0039

Re: How fast will my truck go?
47GinPole #1270465 Wed Jun 27 2018 07:09 PM
Joined: Aug 2017
Posts: 53
G
Wrench Fetcher
I have a 1942 1.5 ton duelly with a 235 4 speed (compound) Wide open I had it topped out at a whopping 42 MPH...Thought the thing was going to explode lol Comfortably I can drive it 35-37 mph as she seems to be happy there. These larger Big Bolts dont stop very well so use caution.

Gregg

Re: How fast will my truck go?
47GinPole #1270484 Wed Jun 27 2018 10:50 PM
Joined: Jun 2018
Posts: 33
4
Wrench Fetcher
Alright, thanks for all the help. Is there a transmission swap i could do to go 55-60 comfortably? Maybe i have to lose the two speed rear? im new to all of this! Im obviously not looking to set any land speed records but id like to be able to make the 20 mile drive into town without making too many people unhappy haha.


Logan
2010 Silverado 2500HD
1947 GMC 300
Re: How fast will my truck go?
47GinPole #1270497 Thu Jun 28 2018 01:50 AM
Joined: Mar 2004
Posts: 4,546
M
Shop Shark
Are you going to haul heavy loads or just a cooler and lawn chairs?

The factory transmission and rear were engineered to work with the power the engine has to offer, are you planning an engine swap as well?

Mike B smile

Re: How fast will my truck go?
47GinPole #1270501 Thu Jun 28 2018 02:24 AM
Joined: Feb 2004
Posts: 20,608
H
Boltergeist
Getting that rig up to 55-60 is a pipe dream, and no, it won't be comfortable. It will be all over the road, and if anybody else is on the road with you, you'll be a deadly hazard to navigation. Be absolutely sure you rebuild the brakes, steering, and suspension to "factory new" condition before you even consider any sort of gearing upgrade. 2 speed rear axles have two basic operating modes - - - -"slow" and "slower". The 248 with the 2-speed should top out around 45, no matter what you do to it other than swapping to a higher ratio single speed rear end. Then you'll have a really big "Cowboy Cadillac" that will be worthless for carrying the kinds of loads it was designed to haul.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: How fast will my truck go?
47GinPole #1270504 Thu Jun 28 2018 03:04 AM
Joined: Nov 2010
Posts: 608
R
Shop Shark
My 46 2-ton that was still running the splash lubricated babbited rod bearings. It could run up to 55 comfortably on the interstate. I had it 63-65 a few times, but it didn't feel right! 55 wasn't bad. I had rebuilt the engine with .030 over pistons. Everything else was stock internal and only upgrade to a Bosch blue coil externally. Stock induction and a 2 1/4" exhaust pipe on the stock manifold. 8.25 tires in the back with a single speed rear end.

Gotta make sure the thing stops and steer's as it should first. If you want a faster driving truck, consider a chassis swap. I'm not a big fan of that, but it would be an easier way to go to just put your cab on another chassis!

I also routinely had the bed loaded with 8,000-12,000 pounds worth of steel. It was comfortable at that, but would only reach about 40...

Decide what you want the truck to do and plan the build.


Randy Domeck
Indianapolis Fabrications
rdomeck@me.com
Indianapolis, In. 46254
317-258-0039

Re: How fast will my truck go?
47GinPole #1270608 Fri Jun 29 2018 11:09 AM
Joined: Jun 2018
Posts: 46
D
Wrench Fetcher
Oops, hit the wrong button there. Can anyone share the secret formula to estimate top speed if the gear ratios are known? I ain't that bright can push buttons on a calculator. Thanks.


Don't tweet, face, Google, or link. Just hanging in as long as I can...
Page 1 of 2 1 2

Moderated by  69Cuda, Grigg 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4