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Can I put Mercon V in my 1994 4.6? Or is this just for the later cars?

I currently have Dexron III plus additive, and after 4yrs and 50k miles, its just starting to shudder slightly in 3rd and 4th, normally when changing into 4th, or kicking down in 4th. My transmission shop want to use the same again, but I've found a supplier for Mercon V (which is ver hard to get hold of in the UK), and would prefer him to use this.
 

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Yes, you can use Mercon V, and you should use it if you can get it.
 

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Thanks, thats what I thought. They sell it in 5 litre tins, so I suppose I'm going to need 3 tins (1litre = 1.06 quarts). To give you an idea of what its like over here, its working out to the equivalent of about $12 per litre plus sales tax and delivery.
 

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I just spoke to my trans shop to make sure he was ok to fit fluid that I supply, and to clarify the amount he would need. He said that it was not possible to drain the torque converter, so I would only need about 8 litres, yet in the tech articles on here it says you just need to take the rubber bung out of the bellhousing, align the drain hole in the TC with the bellhousing opening, take the screw out and you can drain it. is that correct? Its not an early/late TC thing is it?
 

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Some TC's do and dont have the drain plug..
he could be right, or very wrong..

my stock mark 8 TC has a drain plug, dunno if you Tbird does.

only ONE way to find out..
You should go up there and have them pull the inspection plug from the bellhousing and turn the TC around until you verify the presense or lack of a drain plug.

this wouldn't be the first time TCCOA knew more than a trans shop tech.
 

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Discussion Starter #6 (Edited)
Some TC's do and dont have the drain plug..
he could be right, or very wrong..

my stock mark 8 TC has a drain plug, dunno if you Tbird does.

only ONE way to find out..
You should go up there and have them pull the inspection plug from the bellhousing and turn the TC around until you verify the presense or lack of a drain plug.

this wouldn't be the first time TCCOA knew more than a trans shop tech.
Yes, I could believe that!

If there turns out not to be a drain plug, and the fluid in the TC (dexron III + additive) has to stay in there, if he then refills it with Mercon V will that "mix" ok, or would I be better sticking with the existing dexron?

This is where I'm planning to get the Mercon:

http://americanautobarn.com/store/index.php?main_page=product_info&cPath=248_250&products_id=1204

I was originally concerned that it said "Required for late model FORD Automatic transmissions. Use where MERCON V is specified". Also, the bit in the TCCOA tech article about the trans seals being upgraded on the later transmissions.
 

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There's been a drain plug in every one I've personally seen; 5 so far, 2x '02, 2x '96, 1x Dirtyd0g. :)
 

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Hmmm, I think I may use a different trans specialist....
 

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Yes, I could believe that!

If there turns out not to be a drain plug, and the fluid in the TC (dexron III + additive) has to stay in there, if he then refills it with Mercon V will that "mix" ok, or would I be better sticking with the existing dexron?

This is where I'm planning to get the Mercon:

http://americanautobarn.com/store/index.php?main_page=product_info&cPath=248_250&products_id=1204

I was originally concerned that it said "Required for late model FORD Automatic transmissions. Use where MERCON V is specified". Also, the bit in the TCCOA tech article about the trans seals being upgraded on the later transmissions.
It is now specified for almost all fords that had Mercon. It is double specified for the 4R70W, there is a TSB suggesting it for over a decade.
 

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And if by some strange quirk, there is no drain plug ..... disconnect the top transmission line at the radiator, put a hose bib end in place, attach hose, put other end in big bucket, start and watch and when fluid stops coming out, turn off.

You really would be best served if you can get a complete change in, all 12 qts.

My '95 had the plug as did my '98 and '00 CVPIs (I'm pretty sure my '01 Merc does, but I know that we added plugs to some later cars and my '01 might have been one we added a plug to, I help a buddy at his shop some times when OD). My issued '06 CVPI does not have a TC drain.

If not already done, now iis a good time to add an additional cooler in front of lower radiator, plumb it between the top radiator fitting and the return line back to trans. I used several clamps.

$180 for enough to change fluid, that's just obsene.

Yes, use Mercon V. These 4R70W transmission's TCs slip variably according to commands from the PCM, and when they first came out, Ford went through several formulations of Mercon trying to solve shudder while allowing the clutch facings to slip smoothly upon command (please excuse my crude description). Mercon V is the result of those several years worth of trials and as far as I know, now recommended for all 4R70W transmissions.

Got my '95 back in May with 52,xxx miles and first drive, it shuddered really badly at somewhere near 35-45 under light throttle like you describe, only bad, and the "wife unit" thought I'ld throwed good money away. Picked up 14 quarts Mercon V (I bravely told wife "no big thing, probably original fluid, and I knew a complete change took 12 in the police cars, I got extra for the cooler, used 13 total) and a filter kit and aux cooler kit, changed it all out, it never hinted at shudder again, not for a moment. Difference was like night and day.
 

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Discussion Starter #12
And if by some strange quirk, there is no drain plug ..... disconnect the top transmission line at the radiator, put a hose bib end in place, attach hose, put other end in big bucket, start and watch and when fluid stops coming out, turn off. .....

Got my '95 back in May with 52,xxx miles and first drive, it shuddered really badly at somewhere near 35-45 under light throttle like you describe, only bad, and the "wife unit" thought I'ld throwed good money away. Picked up 14 quarts Mercon V (I bravely told wife "no big thing, probably original fluid, and I knew a complete change took 12 in the police cars, I got extra for the cooler, used 13 total) and a filter kit and aux cooler kit, changed it all out, it never hinted at shudder again, not for a moment. Difference was like night and day.
Sorry for not replying to this sooner. Thanks for the info. Its very reassuring that you've had the same problem as I have, and that the fluid change has fixed it.

I have the car booked in for Friday, and the fluid arrived today. I was a bit concerned that although it is in a Ford branded bottle, it doesn't actually say "Mercon" on the outside of the bottle.

The numbers that are on there are:
E-M5
8000 046
A975X M2 C202BB
WSS-M2C202-B

I think the last one means that it is Mercon, but doesn't it normally say "Mercon" on the bottle???
 

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Well, i bought a case of it from my local Ford dealer, up here in Canada. It states in big letters on each bottle............Motorcraft Mercon V Automatic Transmission Fluid.
 

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Sorry for not replying to this sooner. Thanks for the info. Its very reassuring that you've had the same problem as I have, and that the fluid change has fixed it.

I have the car booked in for Friday, and the fluid arrived today. I was a bit concerned that although it is in a Ford branded bottle, it doesn't actually say "Mercon" on the outside of the bottle.

The numbers that are on there are:
E-M5
8000 046
A975X M2 C202BB
WSS-M2C202-B

I think the last one means that it is Mercon, but doesn't it normally say "Mercon" on the bottle???
In the UK Mercon V fluid is recognized under the Ford Europe spec of: wss-m2c202-b

You got the right stuff!!
 

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what about ATF Flushes? The fluid in the TC should also get exchanged with an ATF flushes too, right?
(No need to manually DRAIN the tc with flushes...)
This is what one Ford dealer told me - is this correct?

(btw, i had to print out the TSB and shove it under the service advisor of the local Ford dearler to make him believe that Mercon V is approved for all MN12 cars now, esp 1994 and up)

time for ATF change is coming up for me, too...
 

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what about ATF Flushes? The fluid in the TC should also get exchanged with an ATF flushes too, right?
(No need to manually DRAIN the tc with flushes...)
This is what one Ford dealer told me - is this correct?

(btw, i had to print out the TSB and shove it under the service advisor of the local Ford dearler to make him believe that Mercon V is approved for all MN12 cars now, esp 1994 and up)

time for ATF change is coming up for me, too...

that is correct, but it totally ignores the most overlooked part on a car.
the transmission filter.
A flush will stir up all the crap in your pan and deposit it into the filter, which will not be a good thing for your trans.

now.. a flush, followed by a filter change + 6 qrts of fluid lost when dropping the pan wouldn't be a bad idea.
But..JUST a flush with no filter change is BAD BAD BAD..
 

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Hmmm.... I think my last 2 atf changes have been flushes...wonder if it's time for a filter change, too.... what do you think? my atf filter might have about 30k miles on it...perhaps more....idk for sure...

(when i got my 97 bird with 72k miles, it also had a baaad shudder shifting to 4th and also betw. 35-45 mph, and a ATF change with Mercon-V cured it, and never came back...but just to be on safe side, I have been getting atf flushed more often than recommended...., and so far, seems to have worked... )

but maybe this time i should ask my indie Ford place to do a manual drain/fill INCLUDING the TC, and change the filter also...then next time i can go back to a flush ???

if i do regular drain/fill incl TC with filter change, then i don't need a flush, right?
 

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Hmmm.... I think my last 2 atf changes have been flushes...wonder if it's time for a filter change, too.... what do you think? my atf filter might have about 30k miles on it...perhaps more....idk for sure...

(when i got my 97 bird with 72k miles, it also had a baaad shudder shifting to 4th and also betw. 35-45 mph, and a ATF change with Mercon-V cured it, and never came back...but just to be on safe side, I have been getting atf flushed more often than recommended...., and so far, seems to have worked... )

but maybe this time i should ask my indie Ford place to do a manual drain/fill INCLUDING the TC, and change the filter also...then next time i can go back to a flush ???

if i do regular drain/fill incl TC with filter change, then i don't need a flush, right?

Change your filter any time you change the fluid. You wouldn't change your oil without changing that filter, would you?
 

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makes sense... i guess i am gonna get a complete drain/fill (incl. TC, hopefully these people know how to drain the TC ...otherwise i am forced to get both flush AND drain/fill !!) and filter change, and not a flush...

Thanks. :)
 

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I would definitely replace the filter when changing the tranny fluid. The filter itself will cost about 15 bucks and will help capture all of the clutch material that may still be hiding somewhere in the transmission. If you have access to basic tools (I think the pan it held on by 14 8mm bolts and the TC plug by a 9 or 10mm) and a bucket to capture your fluid, I would go about changing over to Mercon V yourself. In addition to saving money, you get another chance to crawl under your car and do a quick visual inspection.

Also, I recently scored a good deal on a 95 Cougar with 99K because it had a shuddering problem just like you described. Now, after consulting a Ford service manager and TCCoA, I replacing the fluid with Mercon V and have a fine machine that should be good to go for another 100K. A little routine maintenance will go a long way on any car.
 
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