o2man98

Look! Why are people stating that there are 2 different types of ATF? Synthetic and Dex III. THIS IS NOT TRUE!!!

Synthetic or conventional are the actual make up of the products and the DEX III is the friction characteristics of the fluid. A DEX III fluid can be either a synthetic OR conventional product. Both AMSOIL ATF http://www.amsoil.com/StoreFront/atf.aspx?zo=1436102 and Mobil 1 Synthetic ATF http://www.mobiloil.com/USA-English/...hetic_ATF.aspx are DEX III compatible fluids.

If you experience a problem after changing fluids it is almost guaranteed that the problem existed before the change and is now exacerbated.

Also, if you change the filter and the new filter is not seated correctly you could be starving for fluid at high RPM's (shifts) which may be causing your problems. Having your shift points too close to your rev limiter could be why it is now being hit.

WhiteMamba

iTrader: (5)

I have Question on the New Dexron Mercon VI.

I recently changed the fluid on my 05 Silvy .. Droped the Pan twice
with new fluid DEXRON MERCON VI .

I must say... It does seem to shift
different...

Is this New Fluid Synthethic..


With all these thing I've heard about synthetic AFT .. . It makes me Nervous and now want to do a complete system flush (Machine) and
put regular Dino Dexron III In there..


Should I keep the new Fluid or Toss it an
add regular Dexron III

Anybody??

o2man98

Yes, Dexron VI is a synthetic but that does not matter. A Dex III will meet Dex III requirements and a Dex VI will meet Dex VI requirements whether they or synthetic or not. The VI is a SUPERIOR fluid to the III.

Any 2005 or earlier vehicle that used Dex III can use Dex VI. 2006's and newer are filled from the factory with VI.

The TSB I attached to this post.

SSPEEDY

iTrader: (4)

FWIW, Vince at FLT told me if it's touching clutches no synthetic. Perfectly fine for all metal (engine oil).

Formulated

iTrader: (16)

If you guys think the debate over which fluid to use in your 4L60E is heated, you should spend some time working on Hondas. You'll just be happy these transmissions can be repaired for less than a month's salary.

I tend to think that the problem is with the manufacturer of the fluid, not the specification. Mobil, along with all of the other large manufacturers, have a wealth of experience with the OEMs, and pretty much know what it takes to make their product work in production cars. So I'm not surprised to hear that the synthetic that does work is Mobil 1. Smaller companies, like RP or Redline, don't have the exposure to the OEMs that the larger oil companies do, so they don't have much opportunity to fine tune their blends. Likely, all of these oils pass bench test standards for the Dexron classifications, but haven't been road tested en masse until the general public starts trying them.

It does sound like the conventional ATFs are the safest product to use. However, with Mobil's reputation and their exposure to GM I would be confident that Mobil 1 synthetic ATF is reliable in the 4L60E as well.

WhiteMamba

iTrader: (5)

I am still kinda of skeptical about using this New Dexron VI...


Has anybody in here ran this fluid already?

I am kinda of worried. (Since I haven't seen so many
people making the change" to this new fluiid?

Anybody?

Bill'sWS6

iTrader: (6)

I am not saying it is Amsoil or any other brand that caused the problem with my shifts. It may be what someone else had metioned. It may be a combiniation of a couple things.

Changed the Tranny fluid from Dextron III to Amsoil.

1.) 25,000 miles I switched to a 9" rear with a 3:89 gear (previous 3:23 10 bolt)

2.) I had the car tuned for the rear end change.

3.) I have a 3800 converter.

4.) Cam is good producing power to 6,600 rpms.

So, since the trans had 25,000 miles on it. The 3800 conveter makes the car ramp up the RPMs at a much faster rate then stock. Maybe with the wear on the 3-4 clutch packs and the Amsoil ontop. Along with the faster ramp up does not enable the clucthes to engage fast enough? So, it could be a combo of several things.

I just hope with the new trans going in Thursday my trans shifting problems will be over soon.

Still plan on having the old trans opened to check the wear of the 3-4 clutch packs, bands and the shift solenoids. If all are fine and the new trans works I can eliminate a tuning issue.

Thanks for the spirited debate.

Bill

WhiteMamba

iTrader: (5)

So then I guess it's okay to stick with GM Dexron VI Fluid I have in there now?

JS

iTrader: (4)

We're running VI in our LT1 nitrous car 4L60e and its working flawlessly...

joecar

Bill,

Please post pics of what you find, I'm interested to see.

Thanks,
Joe

Bill'sWS6

iTrader: (6)

Will do, the digital camera is ready to go. Pics of the entire process will be taken place. If there is enough light in the shop area I will post a video.

Bill

INMY01TA

iTrader: (1)

Perhaps the Mobile 1 atf isn't really synthetic. (Like their motor oil)

BlackHawk T/A

iTrader: (3)

Of course it will be. GM states it is made for use in "any" transmission that came filled with Dexron III originally.

Racer383

I have run Mobil 1 in my glide for the last 10 years. I only used normal ATF for a few miles of breaking in. Never had a problem and it shifts awesome. This is a manual only tranmission and it shifts very very hard.

Now, on both my LS1 cars, I had heard not to run synthetic. The horror stories were enough for me to listen and only run standard ATF. Maybe its not a synthetic issue, but rather an issue with the trans running one fluid for so long , then being switched. Maybe it had seen synthetic since day one, it would be different. To me, its not worth the chance of blowing it up until I give it a good reason to!

LS1-450

iTrader: (33)

Every time I walk past my car now it says "DEX III" & then clears its' throat.

Am very interested in seeing your pics.

LS1-450

iTrader: (33)

Bill"sWS6,

Have you had a chance to take some pics?

dhdenney

iTrader: (53)

I bought a used Probuilt and an Edge 3400 from a guy and he told me he used TCI RTF from day one. So I bought 3 gallons of the TCI fluid since that's all that tranny has ever seen. I expect this fluid will perform well since it was broke in with this. However, I wouldn't have bought the fluid had he ran just plain old conventional ATF. Tranny is still sitting for now and will be in the car soon. If it shifts well, then great. If not, I'll flush it and try something else.

Jordan S.

iTrader: (17)

My tranny guy tells me to run Synthetic as possible, or even a mix of 5 synthetic the rest conventional. He said the synthetic handles heat alot better.

LS1-450

iTrader: (33)

I thought that mixing caused foaming. Can anyone confirm this?

Bill'sWS6

iTrader: (6)

Still waiting for the trans to be opened. I have the new trans in and am still having the same problem. I hope to get some pics up this week. When the fluid was drained there was clucth material in the fluid.

Dammmmmm, I don't know what to do at this point.

I will still stand by the fact that the shifts changed after the synthetic was put in.

I'll try to rush the pics.

Thanks,

Bill