Forum Discussion

Mickeyfan0805's avatar
Mickeyfan0805
Explorer
Jul 22, 2013

Adding ATF when you don't know what's in there

We had our transmission fluid flushed and replaced last spring and, being the non-mechanical idiot that I am, I didn't ask for detail as to what they filled it with. Since I didn't ask for synthetic,...
Tow Vehicles
Gale_Hawkins's avatar
Gale_Hawkins
Explorer
Jul 22, 2013
RCMAN46 wrote:
Dexron VI is not backward compatible for Allison 1000 prior to 2006. Transynd is best for all of the Allison 1000 transmissions. Your best bet is go with the owners manual and hope the proper fluid was used during the transmission service.


Good point. Dexron VI is spec for GM transmissions and not other brands. I the early years Allison used some O-rings I heard that last OK with Dexron III but not VI.

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