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Old 05-31-2015, 11:21 AM   #481
Mini-Skoolie
 
Join Date: May 2015
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Unlocking transmission

What a pant load--- find a international truck dealer- they do it all the time, bring the whole trick in -not just the computers (engine and trans have their own computers)
I told the dealer I needed the 6th gear for economy and since I have a dumpster truck 50% of my driving is empty - The trans shop won't do it because they don't claim to know the whole truck- where as the truck dealership knows the whole thing.
But remember that 6th gear is not for pulling hills or loads so don't abuse it.
Don't take no for an answer! Persist and pester. Bring tri tip sandwiches-etc. talk to the mechanics. Try a different shop. International guys do it all the time.
Jack.
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Old 05-31-2015, 01:34 PM   #482
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Location: Oklahoma aka "God's blind spot"
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Originally Posted by jazty View Post
If you have an air compressor, you're half way there. A used 4x rivet gun for solid rivets on eBay will set you back $100-150. I bought mine for $120. Sure glad I did. Solid rivets are cheaper and plenty more strong. The hard part is finding a willing helper, since it's a two person process. Oh, and they seal up the hole, unlike standard blind rivets. Now, they do sell closed blind rivets which will seal the hole, but the cost is astronomical. Remember, you should be using steel rivets since the base metal is steel.. Aluminum is the most common material for blind rivets, but mixing metals will result in galvanic corrosion

You'll also need a bucking bar if you plan on going the solid rivet route. They can be purchased on eBay for $20-30. I bought one, but ended up also using chunks of steel that I got for free at a local steel warehouse. They often will have a scrap pile that they don't care much about.

Some pictures: http://books.google.ca/books?id=ViUm...w%20to&f=false



That is essentially what I did, for the back of the bus anyway. I also removed the rivets on the left and right side of the front roof piece so it could be pried up and the sheet metal slipped underneath it. Putting the rivets back in wasn't a huge deal. It's just a bit tight up there.
I found this video riveting
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Old 05-31-2015, 01:47 PM   #483
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Join Date: May 2015
Location: Oklahoma aka "God's blind spot"
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Year: 1989
Coachwork: 1853FC International/Navistar
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Engine: DT466, MT643
Rated Cap: 6 souls and a driver
pretty cool video with great explanation...


although, the narrator reminded me of Ben Stein from
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Old 05-31-2015, 01:48 PM   #484
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Year: 1998
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Chassis: TC2000 Rear engine
Engine: Cummins 8.3; MD3060
Rated Cap: 84
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Originally Posted by Dirtdoctor View Post
What a pant load--- find a international truck dealer- they do it all the time, bring the whole trick in -not just the computers (engine and trans have their own computers)
I told the dealer I needed the 6th gear for economy and since I have a dumpster truck 50% of my driving is empty - The trans shop won't do it because they don't claim to know the whole truck- where as the truck dealership knows the whole thing.
But remember that 6th gear is not for pulling hills or loads so don't abuse it.
Don't take no for an answer! Persist and pester. Bring tri tip sandwiches-etc. talk to the mechanics. Try a different shop. International guys do it all the time.
Jack.
This is good to know... I do understand "liability" issue that transmission shop is bringing up. I could even sign a liability waiver... but

I am a big fan of manual transmission and I feel like I will hack this transmission and build my own "manual" shifting box anyways.
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Here is my conversion thread:
http://www.skoolie.net/forums/f11/98-bluebird-tc2000-conversion-2-feet-roof-raise-3-slideouts-9728.html
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Old 06-01-2015, 09:59 AM   #485
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Year: 1946
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Good luck hacking it. There are forums full of folks who have been working on that process. Some for several years. It apparently involves a lot of proprietary code that the manufacturer will not release. I have zero understanding of what it involves but have followed some of the threads for quite a while. There are a number of them over on "4BT swaps.com".

Best of luck with it.
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Old 06-01-2015, 11:12 AM   #486
Mini-Skoolie
 
Join Date: May 2015
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Whacking the computer

The guy that was going around the existing programming for navistar engines is doing time for a federal crime- regarding federal emission standards. I'd not want to mess with the engine computer- who knows how far the Feds consider messing with the transmission computer- if that also is considered emissions tampering.
Just persist when ever you see a navistar dealership- it takes about 10 minutes. But request the letter from the truck maker that it is out of warrantee and not a commercial truck but a personal RV. Don't forget to mention those points and include the VID in all your correspondence and include the name of the dealership where you want the work done.
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Old 06-01-2015, 12:55 PM   #487
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Chassis: TC2000 RE
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Rated Cap: 78
Fortunately I have a "stupid 'ol mechanical Cummins 8.3CTA" engine with a Bosch P7100 pump and 12 valves. The only electrical engine management bit is the fuel lever cutoff solenoid.

I suppose the throttle position sensor counts too, but that's part of the transmission, thankfully.

It would be an awesome exercise to build a replacement computer for the allison gearbox on there. PWM driving the solenoid packs to select all the gears is all it's really doing.

The trick is writing software code that will never:

Crash or break the computer in a way that causes the gearbox to explode, lock up the rear tires and kill people.

Shift hard or cause unnecessary wear on the gearbox

Operate in some corner edge case that causes something like zero engine retard on descending a hill

And a million other things that would worry me greatly. In the end, at least with my vehicle the tires and wheels are tall enough to reach about 65 mph @ 1850 rpm, 63 mph @ 1800 rpm. I would love to have that 6th gear to get the engine rpm a little lower still, but the risks involved in creating a wiring bypass is too high for my comfort.

I'll keep searching for someone who can replace the program with one that allows 6th gear, for now.
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Old 06-01-2015, 06:23 PM   #488
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Join Date: May 2015
Location: Oklahoma aka "God's blind spot"
Posts: 1,681
Year: 1989
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Chassis: 35' Retired Air Force Ambulance
Engine: DT466, MT643
Rated Cap: 6 souls and a driver
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Originally Posted by aaronsb View Post






I know it's an old thread.... but, depending where you drive
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Old 06-01-2015, 07:52 PM   #489
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BTW --- Dave at cumminsallisonconversions.com can reprogram 5's into 6's. He is very knowledgeable in that department and will share his opinions on the process.
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Old 06-01-2015, 08:22 PM   #490
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Rated Cap: 78
Looks like I'll be making a phone call tomorrow.

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BTW --- Dave at cumminsallisonconversions.com can reprogram 5's into 6's. He is very knowledgeable in that department and will share his opinions on the process.
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