The Stovebolt Site Forums The Shop Area Driveline Allison 2200MH Tranny

Well...I just bit the bullet and plunked down a large pile of money for a new from the factory transmission. I knew I wanted an Allison six-speed and after nearly a year of searching finally determined that a brand new Allison would only be a grand or so more expensive than buying a questionable used unit and rebuilding it to my needs. Plus this one will sport a 5 year, 200K warranty.

Anybody here taken on installing one of these fourth generation units? Still a lot to work out, so I'm shopping for any experience I can find.

Do you have the whole wiring harness and the controller? If you're buying it new they should be able to set you up with all that, a program to run it as a stand alone unit, and a throttle position sensor.

Grigg

Howdy Grigg --- The trans comes with the TPS and an A53 TCM which they will program but no harness. They are made up for each application by the chassis manufacturers but it looks like my best bet is starting with a Gen 4 harness from an International and paring it down to what little I need. I spoke with the Allison rep who happened to be at Stewart & Stevenson while I was there and they really like the way IHC puts theirs together. Just now starting a search for one.

The water/oil cooling for the tranny could get tricky since I have so little room in the "V" shaped nose of this old '46. The radiator & turbo intercooler have to jam in there as well an electric fan. Gonna be tight.

Found the 7 point shifter (Trans also has a parking pawl) through Orscheln Products. They can also supply throttle pedals, fill & dipstick kits and a few other Allison related items in case anyone else is looking.

And BTW...since you are the master of axle info & updates, by any chance do you know the WMS to WMS measure on the rear of a '46 1.5T dually? Need that number but it will be a while before I can pull any wheels and none of the books I have even list them.

And...just in case anyone besides me was unaware of this...
Never, ever weld on any vehicle that has any onboard computers (especially TCM's) without disconnecting the battery. It can cook everything instantly. I, for one, was totally unaware of this so I wanted to pass it on.

Sounds like you have a good plan.
Don't know the axle measurement on your 46. You can get a close guess without removing the wheels, think a little.

Just a quick search on transmission coolers turns up these finned coolers
http://www.makcotransmissionparts.com/Allisoncooler.html
Note that some are stand alone with an electric fan. I've seen hydraulic oil coolers the same way on construction equipment and trucks with hydraulic cranes and things like that, one of those would do as well.

Roadranger has a number of coolant options, some are remote mounted water to oil heat exchangers. These will get you started thinking
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/rr_apsl-0021.pdf
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_065654.pdf
cut and paste I guess..

Thanks Grigg --- the links and info are much appreciated. Have an estimate on the WMS based on the back of the brakes but was hoping someone here might have a real measure.