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Old 05-23-2018, 10:04 AM   #1
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Manual transmission

It seems the manual transmission is a rare thing in this skoolie world.I think I am going to end up with a NV5600 in my short bus. Is any body running a 6speed with cummins 12valve ? Am I the last person on earth to drive manual transmissions? __ I feel so alone!

cheers, william
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Old 05-23-2018, 10:22 AM   #2
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The bus I'm bidding on has a 12v mated to a manual as well. I'll know in a week if I get it.
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Old 05-23-2018, 10:27 AM   #3
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We do see a few buses with manual transmissions but, yes they are somewhat rare.

I asked the transportation manager why they had fallen out of favor. His response was "workers compensation claims". Apparently repetitive motion injuries are a problem with city bus route drivers with manual transmissions.

Most of the 5/6 speed manuals that you will see in school buses will be Fuller or Spicer. In more recent buses the Fuller is the most common.

I have NV5600s in Dodge pickups. I love them in a pickup but would be reluctant to put one in anything but a very short bus.

I have seen a scattering of 6 speed buses for sale here: North Carolina School Bus Surplus System

From what I recall of the ones I checked on, they had around a 6:1 rear gear. That would need to be addressed.

Good luck.
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Old 05-23-2018, 10:51 AM   #4
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Engine: cummins 12 valve
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my plan

The bus I have, but have not seen.... yet. 54 ford. 24' long. expected weight with out people is 12,000 lbs. 245 70-19.5 tires, 3.73 rear gears. 12 valve cummins with about 300 to 350 hp estimated torque 600 ft lbs. andthe NV5600 transmission. I have a f450 chassis to under the bus, that will give me newer parts to source if I have a problem on the road. I dont want to attempt to find parts for a 54 ford while traveling...
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Old 05-23-2018, 11:13 AM   #5
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Sounds like an ambitious plan!

I look forward to watching your build.

I suspect that at 12k you may be in the realm of reality with the NV5600. In a 26k bus I would not have high hopes for longevity.

Keep us updated on your project.
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Old 05-23-2018, 02:11 PM   #6
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Quote:
Originally Posted by magnakansas View Post
It seems the manual transmission is a rare thing in this skoolie world.I think I am going to end up with a NV5600 in my short bus. Is any body running a 6speed with cummins 12valve ? Am I the last person on earth to drive manual transmissions? __ I feel so alone!

cheers, william

I've got one...


40 footer, 5.9 Cummins, 5 Speed Fuller, 120kms top speed...love it, like drivin' a truck.
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Old 05-23-2018, 04:28 PM   #7
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rpm at 65mph

If I have calculated correctly I will be turning just under 1900 rpm in 6th gear and around 2500 rpm in 5th at 65mph. What are you guys turning at cruise speed, and what is your cruise speed. 5th is 1:1 and 6th about .73 over drive for my intended transmission. If I break it, I am going to use a fuller with over drive, probably the 7 speed. That would be the closest match to the NV and only weighs about 175 lbs pound more.

thanks to all that have answered.
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Old 05-23-2018, 05:45 PM   #8
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Originally Posted by magnakansas View Post
If I have calculated correctly I will be turning just under 1900 rpm in 6th gear and around 2500 rpm in 5th at 65mph. What are you guys turning at cruise speed, and what is your cruise speed. 5th is 1:1 and 6th about .73 over drive for my intended transmission. If I break it, I am going to use a fuller with over drive, probably the 7 speed. That would be the closest match to the NV and only weighs about 175 lbs pound more.

thanks to all that have answered.
I have a Cummins 8.3. Rev limit is 2200. 4th gear is 1:1, 5th is 0.75:1. 6th, when unlocked, is 0.65:1

Current top speed is around 67 mph in 5th. There are three ways to go faster. One is to stiffen the governor springs because the engine is happy to 3400 rpm. Another way would be to stick a 4.78 (up from 5.3 final drive pinion set in. 3rd way would be to get 6th unlocked.

My preference would be to unlock what I already have. It would be the cheapest option and it would reduce the rpm at, say, 65 mph, for fuel economy while cruising. Next best would be to change the FD, but that is quite expensive.

Cheapest way would be to fix the governor springs and fuel plate, but that would cost fuel ... maybe. Advancing the timing might help with that.
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Old 05-23-2018, 06:47 PM   #9
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we've got a manual 5 speed spicer, its so damn smooth and nice. i wouldnt drive a big rig without a manual, the thought of it is just insane. having driven semi's fully loaded and having my cdl and gone through a bunch of hill country, i love manuals.
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Old 05-23-2018, 06:52 PM   #10
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Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
i'll take the sixth

My 6th gear should be like your 5th. I don't know if the 5.9 would have enough torque to support more overdrive. I assume you also have more bus to move too. I think I will do well with the 5.9 because of the small size. 24' I will also work on undertray to smooth up under the bus too. Lots of work ahead.

william
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