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Old 05-30-2011, 08:44 AM
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C4 transmission fluid mixing?

i bought a 302 and c4 tranny for my ranger engine swap..i left the trannt bolted to the engine and installed them in my truck but as i was doing this i lost some tranny fluid so i went to autozone and they told me to use dex/merc fluid so i did...i put about 3 qts in it ...i drove the truck with no tranny problems other that it would shift from 1st to 2nd really fast.. from 0 to about 10mph it would shift from 1st to 2nd..anyway im doing a b/m shift kit now and this time i went to advance auto and they told me to use type f tranny fluid..i just drained the tranny pan and i removed the valve body but im sure theres still dex/merc in the tq coverter..my question is can i mix the 2 fluids ..i have probably drained about 5qts so far of the dex/merc but not the tq converter...what do i need to do at this point..the c4 i have is about a 1975-78 according to the ban shape and filter shape that is on the valve body...

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Old 05-30-2011, 09:17 AM
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the fluids mix fine with no adverse effects
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Old 05-30-2011, 09:17 AM
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1977 was when Ford started switching from Type F to Mercon ATF. In any event I would't worry about what is left in the TC. Refill w/the correct fluid- Type F will work in your case, and don't worry.
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Old 05-30-2011, 09:31 AM
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F or FA is what is supposed to be in a C4 - and those two do mix. Yep, there are those that say Mercon or other "wonder" ATF will work, but not in my C4 transmissions. Drain the torque converter, add 4 quarts, start and warm the engine/transmission and then slowly add the rest - and that final total number of quarts is somewhere in the range of 8-10 - until the level is at or near the top of the full line of the dipstick. Oh yeah, purge the cooler as well and at least pull the pan and clean the filter.

NAPA usually has F and always has FA, and it's a repackaged Valvoline product locally.

(Dam' I really dislike auto parts counter jocks that don't have a clue.)

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Old 05-30-2011, 10:05 AM
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there is no drain plug on the tc that i have seen so far and i figure there is about 3 qts or so in it ...only way to drain the converter is to unbolt tranny from engine and i dont want to do that ..lol...
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Old 05-30-2011, 11:12 AM
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Quote:
Originally Posted by hddave1
there is no drain plug on the tc that i have seen so far and i figure there is about 3 qts or so in it ...only way to drain the converter is to unbolt tranny from engine and i dont want to do that ..lol...
I would be surprised if it doesn't have a drain. This is an OEM from a '75-'77 Ford product. The replacement TCI has a drain in exactly the same place - engine side.



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Old 05-30-2011, 12:11 PM
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i will look again ..i could be wrong
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Old 05-31-2011, 05:43 PM
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went ahead and mixed and tranny shift fine so far...knock on wood
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