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12-05-2019, 07:28 PM | #1 |
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Duramax Allison issue
Decided to change the screw on external transmission filter during other maintenance work on my 2018 3500 Duramax.
Purchased a well know house brand replacement filter . Immediately experienced down shifting problems. Purchased a GM filter from the dealer @ a 34.00 cost. Problems ended. Going to purchase a couple of more for inventory. Be aware if you have late model Duramax tow rig. Steve Teeter. STK 6380/6283 |
12-06-2019, 07:57 AM | #2 |
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Re: Duramax Allison issue
We have some service trucks with Allison transmissions.
Was told to run nothing but the OEM filters in them. No issues doing this, but I haven't tried anything else. |
12-06-2019, 08:55 AM | #3 |
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Re: Duramax Allison issue
Thank you very much for the heads-up!
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Jim Kaekel 3836 STK |
12-06-2019, 09:30 AM | #4 |
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Re: Duramax Allison issue
I personally think the aftermarket shouldn’t produce any type of filter for a duramax or Allison . Fuel filters are the big deal most house brand fuel filters won’t pull moisture out of the fuel causing massive damage to the direct injection pumps, the Allison trans is a great example of you better have the sense to service often or else.....
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12-06-2019, 01:48 PM | #5 |
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Re: Duramax Allison issue
Thought I was buying a high quality filter brand. No Fram stuff. Micro size of the filter is obviously critical to the Allison transmission flow requirements.
Difficult to understand how a major filter manufacture had not done any engineering on the flow rate required on a replacement filter they are selling. Seems to me they are opening themselves up to a class action law suit. Steve Teeter. STK 6380/6283. |
12-06-2019, 03:11 PM | #6 |
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Re: Duramax Allison issue
Same for the fluid you use. Allison has recommendations and approved products on their site.
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Barry Polley 758 A/SA California Screaming! California- No place to race! |
12-06-2019, 06:04 PM | #7 | |
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Re: Duramax Allison issue
Quote:
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12-06-2019, 06:27 PM | #8 |
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Re: Duramax Allison issue
No I did not change transmission fluid. I did add additional Dex Vl after changing filters. I did use this same manufacturers filter in my 2012 3500 Durmax/Allison with no issues. After changing filters on my 2018 , when i was off the throttle , coming up to a stop light, it would bang hard when it down shifted into 1st gear. Up shifts under power , no issues. Only downshifting.
It's all I changed ( other than engine oil and filter ). I purchased and installed the GM OEM filter, added addition Dex Vl and the downshifting issue has not happened since Hope this saves other Racers some headaches Steve Teeter STK. -380/6283. |
12-06-2019, 06:38 PM | #9 |
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Re: Duramax Allison issue
I don't know much about the Duramax Allison, but I've needed to service both the Allison 3000 & Allison 4000.
When Allison switched from Dextron ATF type fluids to their Transynd fluid, I noticed the stuff is very thick and probably won't flow through most standard transmission filters. Kind of an odd type fluid, but if you regularly maintain the 3000 & 4000, they are literally indestructible. Kind of need to do what they say. Loren |
12-06-2019, 06:53 PM | #10 |
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Re: Duramax Allison issue
YIt's a Allison trans not a GM design and manufactured trans!
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