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Old 10-15-2002, 12:25 PM
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Post Allison Trans

The Allison 1000 5 speed trans is actualy a 6 speed trans. If you drop the #3 servo and pick up the #2 and #4 servo at the same time this trans will go into 6th gear. This is a second overdrive gear which will lower the RPM's signifcantly at cruising speed. Acheiving greater fuel mileage. Chevy/Allison did not want these transmissions spinning the tail shafts that fast, so they only let the Allison 1000 pick up 5 gears. While towing heavy payloads the tail shaft wont receive enough lubrication to cool the components (in 6th gear). There-for they locked out this gear. I tow a 3500 lb ski boat. Now the question.--- Who has the soft ware to change the program to pick up the gear that is already in the trans not being used??? I have lots of friends with the same Duramax Diesel/Allison 1000 5/6 speed Trans wanting to pay for this option. There are also 136.000 more on the road that may be interested. Deseldr.

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Old 10-16-2002, 08:40 AM
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So I take it that the Allison transmissions are fully computer controlled? If that's the case, I tend to wonder if a speed shop (or possibly even dealer) has the capabilities through their diagnostics machine. You could try to contact Allison directly but I don't know if that would get you anyway. Also, you could try to get a hold of people that make the "power programmers" for your vehicle and see if they can offer any information for you.
Sorry that I can't be of much help with this. Those trannies are probably a little to advanced to find help here.
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Old 10-16-2002, 12:21 PM
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I belive they have come out with new chips for them. Our VP has one and has been waiting on them to come out and seems like I heard him talking about it. He is out of town so I cant ask him right now. But he was going thru a speed shop for it. I also know he just did a BINKS conversion on the exhust so may check see who is your authorized Brinks dealer in your area and start there. The VP will be back I thing next week and Ill ask him.
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Old 10-18-2002, 03:26 PM
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Check on the interchange with a reputable salvage yard. If Allison made this a six speed they sold it to someone using it as such. Likely it would be in a GMC short straight truck supplied by Isuzu. These units are available with either the diesel or G.M. gas engines.

Hope it helps.

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Old 10-19-2003, 03:07 PM
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I just bought a non computer MT42 Allison 6 speed auto

I am in great need of information on this tranny. I am searching ebery where. It was too good a deal to pass up. Got it for $250.00. Any of you have experince with the non computer 6 speeds? Or a good site to learn from?
Slider in Wa.Thanks
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Old 10-19-2003, 07:45 PM

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Slider, I don't know squat about Allison 5/6 speed autos. I think you have the manual coming from a V-6 bus that was a diesel? Think you may have the right deal for your COE if you can get it hooked up to your 455. What I am hearing about the new automatic, computerized Allison, it is not so strong and some expensive repairs have been in order. I'll check with some of my long time diesel Buds and see what they have ot say about your bus tranny.

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