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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 01-28-2016, 03:46 PM   #1 (permalink)
Gear Grinder
Join Date: Jan 2016
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2001 Chevy 2500 HD Allison

What I've got is a 2001 Chevy 2500 HD 4x4 with the 8.1 and Allison Transmission. For some reason for the last 2 months or so, I would have to put it into reverse and back up before it would go into Drive. Well 2 weeks ago, It wouldn't backup anymore. And I still have no forward movement. So I went and bought a used transmission, installed it, and still have the same problem. My Dash indicator where is has the odometer, PRND123 has been out for a long time. As of now it is still out. I tried another TCM, and NSBU switch, and didn't change anything. One thing I did try is to disconnect the round plug on the back of the transmission, and now my Dash indicator is on, and I can put it in all gears and it will move. As soon as I plug it back in, I have nothing again. With my scanner I can pull one code consistently everytime I reset the codes. P1710 P1713 What is happening is when I first start the truck, All the gauges work, when I put it in any gear all the gauges quit working except for Battery and Oil Pressure. Any gear you put the transmission in feels like neutral, and that's it. What am I doing wrong?

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Old 01-29-2016, 09:46 AM   #2 (permalink)
Gear Grinder
Join Date: Jan 2016
Posts: 2
iTrader Score: 0 reviews

I finally figured it out. After countless hours of wire tracing, looking for broken or chaffed wires, I replaced the ignition switch and much to my surprise it fixed everything. I hope this will help someone out in the future. I enjoyed reading through your forum

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Old 02-03-2016, 09:38 AM   #3 (permalink)
Sparkplug Hunter
Join Date: Feb 2016
Location: Mobile, AL
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so i have the 01lb7, so far i have towed a 3 to 4k pound car a dodge chrger, and on the way home the next day no tow, i was around 85 plus and i was seeing how fast and the power get up on the interstate. well it just shut down and had a power loss, and didnt let me have any throttle again until i got to about 40 mph and the throttle kicked back in. no warning lights or anything and it happened one more time when i got kinda high in speed. i did tow without using my tow/haul, but i figured it would be perfectly fine with that load. the other day i was in park and truck was still running bc i kep it runnin if its 10 to 15 minutes or less. well i pulled out and it was stuck in first gear, actied like it just didnt wanna shift gears. i pulled over turned the truck off qnd restrrted and drove just fine i had to drove 120 miles after thta no problems? 01lb7 with all stock and jus replacement water seperator as far as anything else no problems and tender love and care. i do wanna add a fuel lift pump, and maybe a few other things to help with the trucks tranny. also i was really intrigued by "Hot Shots' ADDITIVES. they have a fuel, oil, and tranny additives all alleged to do wonders? Any one with expperince with these and or any advice as to quality parts that are affordable and help enhance the stock feul and transmission as well as intake outake. i only wanna do some simple upgraged in order for the engine and tranny to last to a million. i believe im gonna make it at 250k so far no problems except what i mentioned earlier, which could be related to fuel flow or injectors that need to be treated
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