I switched from 3 to 6 two years ago, & haven't had any problems. Just because it's not recommended in Allison trannys means nothing for the 4T65E, as 6 is used in the 06 cars & newer. Here, the 3 goes for $1 a qt less, but in my case I did a pan drop & filter/fluid change, & a flush a month later using Dex 6. GARY
Maybe a little off topic, but maybe helpful. I used Lucas Oil Multi-Vehicle ATF
on my last tranny fluid/filter change. I had the occasional "park to drive lag" and it doesnt seem to help it much, vs regular Dex 6. Has anyone else tried this? I love most Lucas products but I've been unsure about this, since our trannies are weak to begin with! Just throwing it out there
There were a few posts with people who switched to Dex 6 and now had the hard shifting, and they switched back to 3 and had no problems. I went with the Dex 6 club, and could see no difference. The next time around I will go back to 3.
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