Are there any posts on Synthetic Mobile One ATF in place of Dexron? I was at the local Autozone and read the bottle and it says can be used in its place. What do you think about full synthetic. The motor oil is supposed to resist thermal breakdown much better. Would this be true for the Synthetic ATF also? I did read the post on the Dexron VI, is that synthetic?

 

I use Royal Purple MAX ATF....good results.

SDB

 

I think RP is the only synthetic that works good in these trannys, others seem allow too much slip.

 

form everyone ive spoke with they always said NO!!!

 

Thanks, maybe i will try the Royal Purple. I was worried about to much slippage with the synthetic. What is the Dex VI people are talking about on here that is supposed to keep the tranny cooler?

 

where do you get it at. no where locally has it it seems. Not even O'Reilly

 

I bought Royal Purple gear lube from Thunder Racing, i will check to see if they carry Trans Fluid also. I checked and they do list the RP synthetic ATF also.

 

atf........

 

Automatic trans fluid?

 

Yank told me a resounding "NO" when I asked them about using a synthetic. Something about it being too slippery and burning out the bands/clutches (don't remember exactly) earlier in life. They told me to only use Dexron.
Ed

 

OH, i have better research this some more as i am putting my converter in this week. Thankyou for the information

 

I recently just purchased a fully built 4l60e and my tranny builder specifically told me not to use synthetic fluid. He said it would cause problems with the bands and clutches and he wouldn't warrantee the tranny if synthetic was used.

 

It is beginning to sound like sythetic is a bad idea. I'm glad i checked hear before i purchased.

 

Of all the synthetic fluids available, the consensus is that Royal Purple is the only one that tranny experts agree on....but MANY builder still prefer plain ol' ATF over synthetic, even Royal Purple. I like RP because it handles heat better, and I can go a whole season before changing fluid.

SDB

 

So you ran RP without any slipping issues? I was thinking the same about the heat resistance properties.

 

What about Amsoil ATF. I've heard good things about it aswell.

 

My car just went to the tranny shop with 2nd gear fried. I put (the damn expensive) purple ATF in mine when I put in the stall and it has been slipping ever since. I wouldn't put ANYTHING in it after this rebuild but dextron. Learn from my mistake its an expensive one.

 

Thanks for the warning. Does anybody know about the Dextron VI some people are talking about on here? It is supposed to take the place of Dextron III?

 

i think dexron 6 has already taken the place of dexron 3 at the dealers, in fact i think they have had just about ever number, IV, V, and now VI...

 

you should be fine with the mobil 1 synthetic ATF. one of my guys at work uses that stuff religiously in his cars and has never had a problem. i guess hes drained as much out as he could by droping the pan and removing the bolt on the converter (yes fords have them) and filled them with mobil 1 syn ATF and nothing bad has come of it. one car had 60 some thousand miles when he drained it and put it in, and other was brand new, and both have PLENTY of miles on them now

i dont think mobil 1 would give you a problem, i think that RP or trick shift would since those are synthetics that are made to be slick. look at the back of a trick shift bottle and it even says "not to be used on stock transmissions". i cant find that anywhere on my mobil 1 bottles.

i emailed mobil about their syn ATF and this is the answer i got.

i have 15 quarts here and am gonna flush and fill the trans when i can. if i didnt have some problems before with my converter i probably wouldnt be doing a full flush and fill, but i want to make sure the aluminum is out of the trans. im also planning on flushing my power steering fluid and putting the rest of my syn ATF in there too