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

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Old 06-10-2019, 04:06 PM   #1 (permalink)
bhawes
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2007 Allison problems

My transmission troubles have returned after a 3 month hiatus.
The transmission has been momentarily disengaging when going from 2 to 3 gear. It then acts normally. I had had a complete service done before Christmas. Internal and exterior filter changed, one solenoid replaced, good cleaning, etc.
Yesterday it statted throwing codes (PO732, PO729, PO128, and PO729 again. It was also stuch in 5th gear after the last code. Turning off the engine and restarting after 5 minutes returned the trasmission to normal operation.
There are no Allison specialists in this area, just the Chev dealership. A local transmission shop did the work in December and they are not wanting to spend my money on trying to fix someth8ng that they cannot identify. They have driven it a few times with their diagnostics attached, but are unable to find a specific cause. I need a reliable vehicle, but donít know what to do next. Any ideas!

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Old 06-10-2019, 04:54 PM   #2 (permalink)
OkDually
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Thread relocated over to "Allison OEM"



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Old 06-11-2019, 09:23 AM   #3 (permalink)
Rvn4me
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P0729
https://www.dieselplace.com/forum/57...code-help.html

P0732 Gear 2 Incorrect Ratio. I hade this code and it was a rebuild.

DTC P0128 is designed to detect for a stuck open thermostat.

Last edited by Rvn4me; 06-11-2019 at 09:30 AM.
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Old 06-11-2019, 11:35 AM   #4 (permalink)
bhawes
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Who did the rebuild for you and where are they at? No that GM owns all the rights to the Allison 1000ís, they are about the only ones that will work on them in Canada and they donít rebuild them, they replace them $$$$$$$.
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Old 07-05-2019, 02:04 PM   #5 (permalink)
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I ordered a new speed sensor for the input shaft and installed it yesterday. I took the truckfor a very short drive down to the dog park, and now between 2nd and 3rd, it made an awful grinding noise for 2-3 seconds and then shifted. This is totally new, and very disturbing. Iím planning a trip in 2 weeks, but donít feel like I can trust the truck. Iíll be loaded and have to cross two serious mountain passes.
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Old 07-05-2019, 07:01 PM   #6 (permalink)
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So I just took the truck for a short spin again. No grinding noise but the momentary slip between 2nd and 3 rd gear came back. It happens in the same place everytime. Going downhill after stopping for a stop sign after driving less than a mile. No hard excelleration, barely any throttle required. It never does this clibing hills or under load. It also has not thrown a code of any sort for quite some time. Is it possible that the output shaft sensoris faulty? If so Iíd think it would act up in more than 1 shift location. P.O. 0732 was the code that it used to throw.
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Old 08-11-2019, 04:42 PM   #7 (permalink)
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Bit of an upgrade. I finally took it to the local Chev Dealer. Their Allison tec did a tranny flush, declared the tranny good and $400 later I was on my way. Tranny worked great for a week and then 50 miles into my trip the problems started up in a big way. I made it to my destination but it was nerve racking! I reduced my load by having my son trailer the boat home, but the tranny was still not happy. I returned to the Dealer, the mechanic took the truck for a drive, experienced all of the same symtoms that I had, and then pronounced the tranny shot.
Rather than purchase a rebuilt ($6,500), I found a used one from who Iím led to believe is trustworthy, and will have my truck back next week. With the money spent before now ($1,400), the cost of the used transmission and the re &re ( another $3,000), Iím crossing my fingers that I have a working transmission. I just want to get this truck working properly so I can sell it.

With Allison having been bought by GMC, there are no rebuilders up here in Canada that I could find. If itís not an obvious fix, the Dealer just wants to replace it. With an older vehicle, that is very cost prohibitive.
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Old 08-22-2019, 12:38 AM   #8 (permalink)
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Quick update. Dealer now declares transmission is dead! Found a used one and they installed for me for $1,500. Then said, new (to me) transmission is fine, but trasfercase is shot. Found a good used transfer case and $1,800 for parts and $2,700 for labour, misc. gaskets,etc, I havea fully functional truck!
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Last edited by OkDually; 08-22-2019 at 08:59 AM. Reason: mpv
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Old 08-22-2019, 02:34 AM   #9 (permalink)
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I hope it's both the transmission and the TC for 1800, and not just the TC alone...and that they put a pump-rub fix into the TC...
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Old 08-22-2019, 10:57 AM   #10 (permalink)
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Quote:
Originally Posted by bhawes View Post
Quick update. Dealer now declares transmission is dead! Found a used one and they installed for me for $1,500. Then said, new (to me) transmission is fine, but trasfercase is shot. Found a good used transfer case and $1,800 for parts and $2,700 for labour, misc. gaskets,etc, I havea fully functional truck!
Hope your dealer reimbursed some $$$$ for misdiagnosed for previous work performed


Last edited by Rvn4me; 08-22-2019 at 10:59 AM.
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