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Discussion Starter #1
in a momentary lapse of brain power, I filled my C4 and converter with Mercon ATF. Its got 4 quarts total of the nine? needed, including filling the converter with about a quart. Was this bad? should I drain it out and put in something else? Can I mix old school ATF with this stuff? Ya, im an I-D-10-T
 

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Unless the transmission has a modern rebuild with valve body work you should really use Type F for the transmission to shift correctly. I probably wouldnt worry about getting the fluid out of the converter but I would drop the pan and get the rest of it out.
 

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Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
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If the transmission has ever been rebuilt by someone other than Ford in it's life, then it will be quite happy with Dexron/Mercon. The aftermarket never reproduced the particular clutches for C4's that Ford originally used. Some people like to use a quart or two of type F and fill the rest of the way with Mercon to "make it shift a bit harder". GM guys figured out years ago to add a quart of type F to their Dexron transmissions to make them performance shift better and also make a transmission that was "slipping a little" last a bit longer.
 

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Discussion Starter #4
its never been rebuilt, has a shift kit in it now and a 2200 stall converter. So you are saying that I can fill it up the rest of the way with regular old school ATF?
 

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Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
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20,657 Posts
Never been rebuilt but has a shift kit and a high stall converter? Um, OK. That's a tough transmission. The last OEM V8 C4 came off the line 20 years ago. Generally speaking, Type F has a LOT of friction modifier in it. Thus a couple of quarts are pretty much enough to "treat" an otherwise healthy transmission full of Mercon. Yes.
 
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