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1979 -

I just replaced the input shaft seal on my gear box and have read how this will suck to bleed etc but. . .

It calls for type F from factory but can I use Mercon Type 3 or Mercon Type 5 to refill it with and have no harm? I have many quarts of each on hand but do not want to taint the system. The power steering had a very red fluid in it. (I assume type F is red just like mercon)


I believe the gear box has never been rebuilt since the seal I replaced was Ford branded. I have owned the truck since 2003 and never messed with it in the 500 miles it has been driven since.
 

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Difficult question to answer. You will get various answers. I say you can’t go wrong with what ford used
I think you could get away with mercon but it will always be in the back of your head bothering you
Or you would not be here asking. But that’s just me. I am not an expert on fluids
 
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