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SDT1DYI · 12-06-2019, 06:27 PM

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, 06:27 PM	#13
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 401 Likes: 0 Liked 453 Times in 146 Posts	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.