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Old 07-14-2011, 01:33 PM   #1
Mini-Skoolie
 
Join Date: May 2010
Location: San Diego, CA
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Year: 1984
Coachwork: Bluebird
Engine: 8.2L Detroit Diesel
Has any body installed an auxiliary overdrive?

I just bought a Spicer 7231D. Sometimes called a brownie box, it is an auxiliary transmission which provides 1:1 direct drive, 0.83 overdrive and a 2.1 underdrive. I know that they were used a lot in industrial equipment such as cranes. I am planning to use this on the highway to reduce my engine speed, reduce the amount of noise inside the bus, and save some fuel. I am also planning to change my rear end from a 5.29 so something more highway friendly. At the moment I run 70mph on the governor at about 3200 rpm

Has anybody every installed one of these into a school bus? If so any tips would be welcome.

Thanks

Graham
Intrepid Handcycles http://www.intrepidequipment.com
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Old 07-14-2011, 02:14 PM   #2
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Re: Has any body installed an auxiliary overdrive?

I havent but when you do you will have to take in account your speed and odometer will be off unless you find out how to get that corrected to.
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Old 07-31-2011, 12:50 PM   #3
Mini-Skoolie
 
Join Date: May 2010
Location: San Diego, CA
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Year: 1984
Coachwork: Bluebird
Engine: 8.2L Detroit Diesel
Re: Has any body installed an auxiliary overdrive?

The overdrive seems to have an output for a speedometer hookup. I haven't torn the whole thing apart yet, so I am not 100% sure on that. I ordered a rebuild kit for it, and it only came in a few days ago, so I was waiting before getting into it. I also thought about installing a GPS and forgetting about the existing speedometer. It gets stuck at 65 any way.

I will also have to splice it into the drive line, so at least one new drive shaft will be necessary. I went out to see a drive shaft specialist last week, and he should be able to take care of that.

Graham

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