Trans & PTU fluid change

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The Gemini

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The SHO is at just about 13,500 miles in its' first year. For a "birthday present", I decided to go ahead and have the transmission fluid changed. I had been noticing the car rolling ever so slightly when putting it in "Park", and along with my driving style, figured it wouldn't be a bad idea.

The shop I use hooks it up and does the BG tranny flush and fill. Took 12 quarts to complete. While they had it up on the rack, I asked them to look into what would be involved with changing the PTU ****. I've heard about and experienced first hand WAAAAAYYYYY too many PTU failures to know & accept there was NO way I was going to go past 20K miles without having it changed.

$340 dollars later, both are complete. Money very well spent, and I would strongly suggest anyone with a PTU car to change the **** in the PTU no more than every 20K miles. As mentioned, my car is only at 13,500 miles, but when they removed the drain plug, they found there were already small metallic shavings/particles being picked up on the magnetized drain plug. Also found the **** to be changing its' consistency to a thicker, grayish type of mess already.

FWIW, they charged me $89 for the PTU change, which really isn't bad considering what I would have gone through trying to do it myself. They drained out the old FF **** through the drain plug, and then put in the new through the vent tube via a very long funnel via the top of the engine compartment. Took several hours for the thick gear oil to drain through the small diameter vent tube this way, which I verified by driving by the shop and seeing my car sitting there with a giant yellow BG funnel sticking out of it.

As far as the tranny fluid, that was also well worth it. The rocking is no longer present when shifting into different gears, and it just feels "tighter", if that makes sense (cue the dirty minded jokes....)


II
 
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The Gemini

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Forgot to mention that this SHO has the PP option, which is supposed to include tranny and PTU coolers to help extend their service life. HA! Either they don't do what they're supposed to, or cars without these coolers are worse off then it would seem.

I'm definitely going to make both of these fluid changes an annual practice for as long as I have the car.


II
 

SilverSH0

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Did they do away with the fill plug on the newer PTUs? I know my 2010 doesn't have a drain plug and they added one later. But I cannot imagine that the fill plug was removed. It should take about 1 or 2 minutes to get the fluid back into the PTU using the plug. It honestly only takes me 15 minutes to change the fluid in my PTU and I don't have a drain. It's jack up car, remove front passenger wheel, put socket extensions through suspension and into plug, remove plug, pump out old fluid, pump in new fluid, replace plug, attach wheel, and lower car. For something that's recommended online to be changed so frequently (and it's super easy), I would recommend doing it yourself. You can buy a pump (only need a cheap one that attaches to the top of the gear **** container), fluid, and all the tools (A ratchet, couple 8" or 12" extensions, and a 12" wobble extension) for less than $89 and then you'll be set for years. I change my fluid every winter while the car is just sitting.
 

mrhighcaliber

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Forgot to mention that this SHO has the PP option, which is supposed to include tranny and PTU coolers to help extend their service life. HA! Either they don't do what they're supposed to, or cars without these coolers are worse off then it would seem.

I'm definitely going to make both of these fluid changes an annual practice for as long as I have the car.


II
Very sound advice. The heat from the catalytic converter in addition to internal friction from torque loads can cause the ptu oil temps to rise above 300°f, that's with the cooler. (Im a leader in ford/roush thermal systems instrumentation engineering dept). The coolers on these only circulate coolant through a small heat exchanger in the cover. That cooler was an after thought based on the way its designed. (The new ones in the fusions and edge sports have a more effective cooling design.) And the non cooled versions in the sho/explorer are especially prone to thermal runaway. One reason I went with carless downpipes. I'm planning every 10k~/yearly change for mine with every 10k/ yearly oil change. $16/qt for amsoil **** comes to $8 more dollars per oil change.

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Hebes10

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Did they do away with the fill plug on the newer PTUs? I know my 2010 doesn't have a drain plug and they added one later. But I cannot imagine that the fill plug was removed. It should take about 1 or 2 minutes to get the fluid back into the PTU using the plug. It honestly only takes me 15 minutes to change the fluid in my PTU and I don't have a drain. It's jack up car, remove front passenger wheel, put socket extensions through suspension and into plug, remove plug, pump out old fluid, pump in new fluid, replace plug, attach wheel, and lower car. For something that's recommended online to be changed so frequently (and it's super easy), I would recommend doing it yourself. You can buy a pump (only need a cheap one that attaches to the top of the gear **** container), fluid, and all the tools (A ratchet, couple 8" or 12" extensions, and a 12" wobble extension) for less than $89 and then you'll be set for years. I change my fluid every winter while the car is just sitting.
How do you pump out the old fluid? I've tried the hand pumps and battery powered oil pumps but neither worked very well.
 

Sholab1

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Very sound advice. The heat from the catalytic converter in addition to internal friction from torque loads can cause the ptu oil temps to rise above 300°f, that's with the cooler. (Im a leader in ford/roush thermal systems instrumentation engineering dept). The coolers on these only circulate coolant through a small heat exchanger in the cover. That cooler was an after thought based on the way its designed. (The new ones in the fusions and edge sports have a more effective cooling design.) And the non cooled versions in the sho/explorer are especially prone to thermal runaway. One reason I went with carless downpipes. I'm planning every 10k~/yearly change for mine with every 10k/ yearly oil change. $16/qt for amsoil **** comes to $8 more dollars per oil change.

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Why temp should we start to worry? Mine runs 181-189 according to tourqe pro

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SilverSH0

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shaker281

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I used the pump from SilverSHO's link above to change my PTU fluid last weekend. Drove it a bit first to warm up the fluid. Worked great. Seemed to have some trouble pumping the new fluid back in, so I just attached the bottle to the fatter hose and squeezed it in. I used RP 75w140. Seems like I got about 3/4 pt out, but I did not measure it. It was rather thin and nasty and even a bit milky looking. There was some sludge on the magnetic fill plug, like others have noticed.
 
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maj13616501

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How much does it take to fill the ptu?

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Jeff2017

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I will have the dealer do my transmission and PTU @ 30k miles. I have noticed no issues with the transmission at 17500k miles.
 

maj13616501

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Thanks..any recommendation on rear axle fluid?

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DILLARD000

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Does anyone know how long it takes to change the ptu fluid?
Depends: year\make\model, if PTU has a drain or not, how quick you\mechanic.
At least an hour, more if you're slow+old like me.
I've Drilled+Tapped my PTU & installed a Fumoto drain valve,
& have custom Fill+Vent hoses up to an OilCan on the FireWall under the hood;
so easy 18oz AmsOil#75w140 PTU Oil change every 6mths along with Engine Oil+Filter.
Click here for more info.
 

The Gemini

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Yep. Totally depends on which PTU setup you have. Mine - changing my PTU fluid is actually easier than changing my oil. But it still takes about an hour. I’ve installed an extension into the engine compartment from the vent ******. I simply remove the drain plug, flush the old fluid out, reinstall the plug, then add 18 oz back thru the extension. That’s what takes the time. Since the PTU doesn’t vent as easy as, say engine/oil, it takes awhile to fill back up.

Now, my Explorer has the crappy PTU design where the drain/fill plug is up high. THAT is a pain in the @$$. So it all depends on which one you have. Plan for a few hours, regardless.

II
 

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