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Old 11-10-2020, 05:02 PM   #1
Winnebago Owner
Join Date: Jul 2020
Posts: 59
Are there any malfunctions in Allison trans not caught by trouble codes ??

due to CV have not traveled much, only 600-700 mile since march 2020.

yesterday felt what seemed a misfire or stutter from engine or transmission, or could have been tires/road - did not last but 5-10 secs.

downshifted and engine sounded perfect, it seemed much like an engine stumbling, and nothing seemed wrong from trans or engine for the remaining 50 mi trip.

but that shutter/stutter seemed real, but absolutely no codes from trans or engine OR has there ever been any mil codes.

W24 chassis, 6 spd allison.

so can there be issues NOT caught/registered by engine/trans ??

ps: anyone have a great way to re-fill the allison trans after draining ???? (saw someone refer to using a 12v fluid pump, how well does that work, fill spout nowhere near a batter in my mh !?)
SmilingSimon is offline   Reply With Quote
Old 11-10-2020, 07:45 PM   #2
Join Date: Jul 2014
Posts: 411
A great way to re-fill the Allison transmission after draining

Every DP I have seen has both the tranny fill tube (and engine oil fill tube) up high. I have tried several things and this one is the best:

The next time you are at a diesel stop or gas station, look for a DEF funnel. These things are long, flexible, and they vent!

I have 3 of them: One for the Allison, one for the engine oil, and one for my fuel additives.

These things are free if you don't mind the dumpster dive; and the width of the flexible tube fits snugly in my Allison and engine oil fill tubes. In fact, you may not leak a drop! ...And you can tip the gallon container up high for maximum fill rate, because as mentioned above, the DEF Funnel is vented! ...Plus one person can handle the whole job with no-mess!

For those of you who don't know, you can check the Allison 3000MH fluid level by using your shift pad. Just do a search on how to do this... and keep in mind your fluid temp has to be above 150F in order for the system to register "quarts low" or "quarts high" in numbers on the pad face.

Additional Tip: When it comes to changing your HWH Dexron III fluid, the best thing I found is a 12V scavenge bump like this one on Amazon ($18):

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2004 Itasca Horizon ISK-40AD, 350HP Cummins 8.3L
115K miles and the best of 3 Diesels I have owned thus far!
imnprsd is offline   Reply With Quote
Old 11-22-2020, 09:42 AM   #3
2014 Tour 42GD
Join Date: Mar 2020
Posts: 30
The computer controlling the trans. or engine only monitors sensors connected to the trans./engine. If there's a mechanical issue not monitored by a sensor then you will not receive a code. Examples: slipping clutch, chipped tooth on a gear, shift valve sticking, etc.
trower is offline   Reply With Quote

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