Dexron VI in T-56?? - Third Generation F-Body Message Boards

livewire · 08-24-2009, 02:33 PM

I've got a gallon of Dex VI and was wondering if its acceptable to use it in a BW T-56? my trans is a 95 model and has the Dex IIE tag on it. I know dex II superceded to Dex III and you can use the VI in place of the III. Only reason I ask is it says on the back of the jug not for use in manual trans applications. I can't see how it would hurt since its just a better blend but figured i'd ask for anyone else's insight before I pour it in. Thanks.

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85MikeTPI · 08-24-2009, 04:41 PM

Has your T56 ever been rebuilt? Some of the newer lubes are not compatible with the older fibre friction rings in the pre-98 Fbody T56s. The rebuilt kits all come with the newer carbon-fibre rings and would be more compatible..

IMHO, I wouldn't take the chance to save $5 and risk a $500+ rebuild.. Use plain old Dex3 or Mobil1 ATF in your T56 and you won't have to worry..

alloy · 08-25-2009, 04:16 PM

I tried mobil 1 atf in my fresh T56 with the carbon fiber rings and it just didn't work out so well. I went back to plain old dex and it shifts much better, no "notchy" shifting now. And it semed like there was a kind of break in period for it. After about 5000 miles my trans seemed to really free up a lot and its a dream to shift now. I was concerend that I'd done something wrong building it, but the switch from synthetic to reguler dex really made a difference in the trans. And it seems to be a lot quiter than everyone here says they are.

I'm sticking with plain dex for now. It works well, no reason to mess with it.

85MikeTPI · 08-25-2009, 09:17 PM

Yeah, you don't want to break in a new rebuild with Mobil1, just like a motor rebuild. I recommend 500 stop&go miles on regular DexIII, then switch to Mobil1 after that if you like.