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Top speed
#1332477 Sun Nov 03 2019 10:48 PM
Joined: Oct 2019
Posts: 227
T
Tony292 Offline OP
Shop Shark
So my 1940 1.5 ton with a 216 isn’t exactly road worthy. All six tires are about 30-40 years old and cracked badly. It also doesn’t have a tachometer and the speedometer doesn’t work. I do have access to some gravel backroads and I downloaded a speedometer app today and took it for a spin. It seems to max out rpm very quickly in 1-3, but in 4th I can get it up to 50 MPH on the iPhone app and it isn’t really redlining at that point. I couldn’t go faster because I didn’t feel safe bug is seems to do 50 with ease and if I had more straight road I think it could’ve easily gone faster.

Wish I had a working tach and speedometer so I could calculate the gear ratio! Maybe I’ll just have to break down and remove the rear diff cover and start counting teeth!

Re: Top speed
Tony292 #1332479 Sun Nov 03 2019 10:51 PM
Joined: Jun 2011
Posts: 3,536
E
Shop Shark
Cleaner to just jack up one wheel and count revs. Whatever it is, it will be slow. What do you want to do with the truck?

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Top speed
EdPruss #1332483 Sun Nov 03 2019 11:00 PM
Joined: Oct 2019
Posts: 227
T
Tony292 Offline OP
Shop Shark
Just some trips to Home Depot, tractor supply here and there. Not a lot of miles but a lot of smiles. And having a 1.5 ton would be a blessing on the farm, I could actually load
Up a ton of bricks or concrete bags, or whatever and not be overloaded.

The main issue is that between my farm (horseshoe bend Idaho) and home
Depot (eagle Idaho) is a 7% grade mountain.
It’s literally 5 miles up 4 miles down.... and I see lots of trucks overheated on the side of the road every day in the summer, mostly F250 and F350 with way too large a travel trailer.

Last edited by Tony292; Sun Nov 03 2019 11:08 PM.
Re: Top speed
Tony292 #1332484 Sun Nov 03 2019 11:10 PM
Joined: Mar 2004
Posts: 4,546
M
Shop Shark
Leave it the way it is...it sounds perfect to me! You may be slow going up the mountain, but you'll be glad to have those lower gears when going down. The factory had the gears and brakes dialed in...messing with one will have an impact on the other.

Mike B smile

Re: Top speed
EdPruss #1332501 Mon Nov 04 2019 12:42 AM
Joined: Oct 2019
Posts: 227
T
Tony292 Offline OP
Shop Shark
Only issues with counting this way is that I can’t see the driveshaft, due to torque tube.

Re: Top speed
Tony292 #1332509 Mon Nov 04 2019 01:40 AM
Joined: Nov 2010
Posts: 608
R
Shop Shark
I had a 46 2-ton that I used for my business. Top speed on the interstate I was able to accomplish was about 65. It didn't like it and was a little uncomfortable. 60 was alright. 58 was good. 55 was great. I would routinely put 10,000 pounds on the back and run across town for deliveries. Largest load was 12,500. Mostly stock. refreshed 235 engine. Updated electrical system. Disc brakes on the front with a dual circuit master. Stock exhaust manifold with 2 1/4" exhaust pipe.

Keep it how it is. Get some good tires and tubes on it. 7.5 in the front. Maybe 8.25 in the rear, but 7.5 might be a better option with the 216 to give you a little bit more torque for those heavier loads.

Last edited by RDomeck; Tue Nov 05 2019 12:18 AM.

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

Re: Top speed
Tony292 #1332525 Mon Nov 04 2019 03:25 AM
Joined: Jun 2011
Posts: 3,536
E
Shop Shark
If you really want to know, put in in high gear, take the plugs out, have a friend turn while you count, or to eliminate any work, roll it down a gentle hill, mark one fan blade, count wheel and fan revs.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Top speed
Tony292 #1332591 Mon Nov 04 2019 09:18 PM
Joined: Apr 2005
Posts: 2,572
C
Shop Shark
For torque tube type driveshafts we use an old hand held tach/dwell meter and a variable strobe light. Run the engine rpm up to 2000rpm and measure the rpm of the jacked up rear wheel. Engine rpm divided by wheel rpm equals rear end ratio. With an open rear end you multiply by two or on a limited slip you jack up both wheels and read direct. Example: engine rpm 2000, wheel rpm 300, rear end ratio is 6.66.


Evan
Re: Top speed
Tony292 #1334516 Wed Nov 20 2019 08:56 PM
Joined: Oct 2019
Posts: 227
T
Tony292 Offline OP
Shop Shark
Well I cleaned enough crud off the axle with a wire brush to find the numbers 37 and 6, rings and pinion tooth counts which comes out to 6.16

Anyone successfully added a 5 speed to a big bolt?

Re: Top speed
Tony292 #1334537 Wed Nov 20 2019 10:59 PM
Joined: Mar 2004
Posts: 4,546
M
Shop Shark
Unless the 5-speed is an OD transmission, the final gear is still the same as your 4-speed...1:1 or direct drive.

Mike B smile

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