External Allison Filter - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 13 (permalink) Old 04-24-2017, 11:56 PM Thread Starter
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External Allison Filter

As this is my first duramax, I am wondering if anyone has any tips or insight when changing the allison external filter. I am wanting to know specifically if I am going to lose enough transmission fluid to have to top off. What anyone recommends when changing the filter. I know it is a can filter and pretty self explanatory, just wanting to know if there is any food for thought before changing mine. Thank you in advance.
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post #2 of 13 (permalink) Old 04-25-2017, 02:14 AM Thread Starter
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I found some info on previous years. Should have thought of that before starting new thread. Can be deleted unless major changes have been made. Thanks


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post #3 of 13 (permalink) Old 04-25-2017, 07:26 AM
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Owners manual....

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post #4 of 13 (permalink) Old 04-25-2017, 08:32 AM
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You only loose a cup of fluid when changing the Allison spin-on filter. Of course it may drip a little when the filter is removed.

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post #5 of 13 (permalink) Old 04-25-2017, 05:51 PM
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I have always just filled the filter with some tranny fluid before screwing it back on. Never had an issue.

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post #6 of 13 (permalink) Old 04-25-2017, 06:14 PM Thread Starter
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Quote:
Originally Posted by ob_1jr View Post
I have always just filled the filter with some tranny fluid before screwing it back on. Never had an issue.


That will be my route....I am anal when it comes to that kinda stuff. Thanks for the info


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post #7 of 13 (permalink) Old 04-26-2017, 06:02 AM
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Also make sure you grab the magnet off the old filter before installing the new one.
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post #8 of 13 (permalink) Old 04-26-2017, 06:03 AM Thread Starter
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Also make sure you grab the magnet off the old filter before installing the new one.


I appreciate the reminder! I watched a few videos showing the process. Knowing what the magnet looks like now should help! Thank you


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post #9 of 13 (permalink) Old 04-26-2017, 07:54 AM
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External Allison Filter

I mixed 1 quart of TranSynd with whatever fluid comes in the trans from the factory. Is that an issue?


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post #10 of 13 (permalink) Old 04-26-2017, 11:53 AM
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Quote:
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I mixed 1 quart of TranSynd with whatever fluid comes in the trans from the factory. Is that an issue?


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Not an issue, they are fully compatible.

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