ATF: Dexron-III Or dexron vI or TranSynd

[wsmithduramax]

So this might be a dumb question but is dex vi bad for a built transmission? Like from Suncoast or PPE? If the transmission is in an LB7

 

[duramaxzak]

When I built my tranny in my 02' I thought Suncoast recommended dex-III.

 

[DBUSHLB7]

When I built my tranny in my 02' I thought Suncoast recommended dex-III.

I thought I remembered Mike recommending Dex 3 in a built unit and Transynd for a stock unit. He's a big fan of Quatrysyn but its rumored to be extremely hard to get.

 

[THEFERMANATOR]

Let me get this straight: Mobil synthetic ATF is equiv to transynd, transynd is the most preferred in the Allison. True?

I'm at 150k on my stock tranny and looking to change filters and fluids, possibly throw a transgo in there.

Since no one has said much on dex iii, and taking the above info into account, I would be safe to use Mobil in place of transynd fluid? I can't find transynd locally, but my bro in law works at a shop,and can get me a good deal on the Mobil synthetic ATF...

Was gonna make a new post, but figured this was somewhat relevant to this particular topic, apologies to OP/forum dwellers if I was wrong here...

NO, MOBIL DELVAC ATF is the same as TRANSYND. And TRANSYND is recommended for stock clutches, ALTO's and such work better with DEX III or QUATRASYN.