Well, time to do a transmission service on my Turbo 400. I've seen lots of debate on here about oil, but not too much about tranny fluid. So just for laughs, what does everybody like to use for ATF?

 

I like Valvoline myself.

 

I use Dexron 6 but some have claimed shifting issues in older trans. No issues for me and doesn't leak any worse despite being slightly thinner and a synthetic blend. The Vavoline Maxlife is Dexron 6 rated and a good deal at Walmart.

 

Im using allison grade trans fluid. Its essentially a fleet atf that most shops use as a top off fluid or to fill up allison transmissions. I prefer castrol trans fluid products as i have had very good luck with them.


I might add what i like about the trans fluid im running now and i found of by accident is. Its design for harsh abuse and higher heat as it is intended for heavy duty useage. Although it has shift "improvers" which most racers dont like i found this fluid is great considering i drive it to the race track and back and the trans so far seems to be handling the abuse very well and under high heat or prolonged use it seems to maintain its performance very well. In short it works better in higher heat situations or sever useage.

 

+1 Valvoline. Plain Dex/Merc for old trannies, Maxlife (synthetic universal) for new stuff.

I don't use the "high mileage" stuff unless there's a specific reason. Those tend to have additives that cause seals to swell. Good for temporarily slowing leaks due to old/dried rubber, but bad news in general.