Duramax Allison issue - Page 2

ss3011 · 12-06-2019, 10:10 PM

Quote:

Originally Posted by Ralph A Powell

Y

It's a Allison trans not a GM design and manufactured trans!

Allison was part of GM Hydramatic when the 1000 was developed . The Engineers from Indy work side by side with us in Ypsilanti . When GM went through bankruptcy Allison was spun off but the only Allison trans that remained with GM was the 1000 because it was in most of the 1-ton pickups . I think it's still built in Baltimore . Also Castrol developed the fully synthetic fluid Trans-Max , and later Allison re-named it Trans-Syn . It is a very good Automatic Transmission Fluid

Mark Lewis · 12-07-2019, 10:18 AM

Would the Trans Syn fluid be better in a 2001 1000 model Allison than the Dexron?

12-07-2019, 12:49 PM

Quote:

Originally Posted by Mark Lewis

Would the Trans Syn fluid be better in a 2001 1000 model Allison than the Dexron?

Yes! My 2003 has it. Smoother and less trans temp. Walmart is the best deal on approved Delvac Allison syn. I don’t use Castrol...

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.

12-07-2019, 10:18 AM	#2
Mark Lewis Member Join Date: Apr 2006 Posts: 349 Likes: 64 Liked 208 Times in 45 Posts	Re: Duramax Allison issue Would the Trans Syn fluid be better in a 2001 1000 model Allison than the Dexron?

12-06-2019, 06:27 PM	#4
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 406 Likes: 0 Liked 456 Times in 148 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.