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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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  #1  
Old 05-15-2011, 11:35 AM
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Transmission fluid change

Well I just bought a '79 F-150 and I want to change the tranny fluid/filter, but the current fluid doesn't look too healthy. It doesn't really smell burnt, it has a real strong fluid smell, and the color isn't exactly cherry. it still has a little of the red color in it, but it's more of a goldish red, almost transparent red. I don't want to drop the pan and change the fluid/filter and the tranny go out on me a day later. What do you guys think? I know there's always a risk, especially with an older transmission, but as of now it seems to shift smooth I would just like to have new fluid and a new filter.

This is about as good as a pic as I can take of it......

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Old 05-15-2011, 12:21 PM
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joshjones.thewelder
The thoughts or "urban myth" of NOT changing the fluid comes from transmissions that are run for like 100,000 miles without ever having things done and then the fluid and filter are changed and the tranny goes to pot.

Bascially the estra grit in the fluid helps with the lack of grit on the bands/ clutches.

I wouldn't think twice about changing the fluid. Definately makes for piece of mind knowing the fluid is fresh and clean.

You're pic isn't super clear, but the fluid looks tired, but not toasty. Might have gotten overheated a time or two, but nothing too alarming.

Some will say to use Dexron/ Mercon my $.02 is to only use Type F.

Josh
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Old 05-15-2011, 12:25 PM
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Use type F. It's less "slippery" than dex/merc and will firm up the shifts, extending the life of the clutches and band.
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Old 05-15-2011, 12:48 PM
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That was a crappy cell phone pic. I only ask because it has happened (once to me and once to my brother) twice before (78 Fairmont wagon and '94 Escort) I worry because I do not know when/if the fluid was ever changed. Better pic coming. Thanks for the responses guys, really does make me feel a little better about doing it, and I'm right there with you with the Type "F".

O.K, here's another crappy pic, but you can see the color a little better I think anyway....

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Old 05-28-2011, 02:00 PM
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So I am finally going to get around to doing this today. I wanted to drive the truck a few miles to see how it was shifting before I dropped the pan. I'm still nervous, but at least the fluid doesn't have a burnt smell to it, that eases my mind a little bit. BTW, this is my first dentside, and I gotta say, these are some damn tough trucks.
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Old 05-28-2011, 02:06 PM
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And for the hell of it, here is a pic of the beast.......

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Old 05-28-2011, 06:11 PM
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Either way you'll end up changing the fluid now or when she blows from not doing it.
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Old 05-28-2011, 06:11 PM
 
 
 
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