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Discussion Starter #1 (Edited)
can mercon v be used in the 4R70W trans.it is supposed to be more of a synthetic oil. or are the friction characteristics wrong for this trans. thanks! --irv
is dexron 6 the same as mercon v or would it be better. im looking for the best protection.
 

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Dexron is a GM product. Don't you dare put that in a Ford/Lincoln/Mercury vehicle. That's sacrilegious.

There is no such animal as Mercon 6.

Use Mercon V and call it a day.
 

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Discussion Starter #3
is the v a synthetic or semi synthetic. just googled the dexron 6.pretty
aggresive stuff. not compatible with mercon.
 

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If I am got mistaking RobertP used synthetic Mercon V at the time of my Jerry-Mod . And she works great :)
 

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Discussion Starter #6
there is an additive made by lubegard that turns dexron 3 into the
properties of mercon v.mechanics around here use it w/good results.
 

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there is an additive made by lubegard that turns dexron 3 into the
properties of mercon v.mechanics around here use it w/good results.
It doesn't work as well as Mercon V IMHO, my trans started shuddering worse using it.

Dr. Tranny's instant shudder fix helped quite a bit, but again not as much as Mercon V.
 

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what about the fluid that is labled "dex/merc" on the bottle? I have never used it...but I do have a case of the stuff in my garage...not that I'd put it in my trans...just curious....
 

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Dexron is a GM product. Don't you dare put that in a Ford/Lincoln/Mercury vehicle. That's sacrilegious.

There is no such animal as Mercon 6.

Use Mercon V and call it a day.
... I use GM Syncromesh in the M5R2 Mazda Transmission in my Ford Tbird.

Oh .. and GM Supercharger fluid in the M90 also. ;)
 

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What about Royal Purple ATF? I'm wanting to switch all of my fluids over to RP products, so far my car is only running RP 10W30.

I've been wondering about the trans fluid and if it's worth putting in the trans. (hopefully to be j-modded)
 

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What about Royal Purple ATF? I'm wanting to switch all of my fluids over to RP products, so far my car is only running RP 10W30.

I've been wondering about the trans fluid and if it's worth putting in the trans. (hopefully to be j-modded)
:zpuke:

Darrin
 

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what about the fluid that is labled "dex/merc" on the bottle? I have never used it...but I do have a case of the stuff in my garage...not that I'd put it in my trans...just curious....
because for the most part dexron III and mercon are essentially the same. in a way they are the companies' own versions of the same basic thing. overall the friction modifiers are interchangeable. dexron VI, mercon V and ATF+4 are NOT interchangeable, the friction modifiers work in very different ways.
 

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A friend of mine with a 100k mile Subaru complained of differential whine the whole time the RP was in the car (about 6 months), upon replacing with Motul it fell silent again.
 

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A friend of mine with a 100k mile Subaru complained of differential whine the whole time the RP was in the car (about 6 months), upon replacing with Motul it fell silent again.

Hmmm interesting I wonder what it with the RP that causes the problem. Have always heard good things about the product /pricey as well
 

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i wouldnt put RP fluid in my trans, but your can run the oil, and maybe the 90w in the diff, might still need the additive for the trac-lock though, not sure. prolly why the subaru was making noise as well, not ure how they set up their Diffs, but if its like a clutch type trac-lock without the friction additive... good luck...

mercV works great in the 4r70w, but if you put any Dex in their it will have shudder and/or explode later. dex/merc stuff is fine, but i would still go Merc if you can. stay away from RP and go with the Merc the trans was made for -_-
 

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I'm actually quite surprised to hear that about the trans fluid. The engine oil has been nothing but awesome, and I flat out refuse to run anything else as far as engine oil goes.

I don't think I have a trac-loc on my 97, so I could probably run RP in the diff.
I could be wrong here, but I think they have 2 formulas for trac-loc or not..... I could be thinking of something else though.
 

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To run rp in a trac loc you will prolly need an limited slip additive put it in first! easier. Also about rp its just too expensive to be nothing special. Before the rise of synthetic oil rp was great now its just another synthetic oil. If you like it run it and you can say I run rp but theres really nothing to it imho
 

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I got the Valvoline Maxlife synthetic Mercon V. It eliminated my transmission fluid leak and made it shift 5x better. :)
 

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RobertP put Wynn’s® Synthetic Blend ATF M5 in mine at Jmod time has been working great no problems/No Lecks whatsoever :)
 
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