Transmission fluid change
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5th Wheeling
Joined: Dec 2023
Posts: 28
Likes: 5
From: Rayville, Louisiana
Transmission fluid change
Hey guys, I have an 87 F-150 with 189,000 on a 5.0. Would it be wise to change the transmission filter and fluids. It shifts fine now but I doubt it’s ever by serviced.
Lead Driver
Joined: May 2011
Posts: 5,776
Likes: 443
As long as a transmission is not slipping, it's best to change the fluid. Adhere to that like its LAW, cuz it is. Ignore all the other buzz about transmission fluid changes. We can get into the technical aspects of *why* that's the law, but for the purposes of answering your question, the aforementioned is sufficient.
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5th Wheeling
Joined: Dec 2023
Posts: 28
Likes: 5
From: Rayville, Louisiana
No slippage
It doesn’t have any slippage at all. It shifts just fine from take off and as you slow down it’s shifting down fine.
I’m gonna go ahead and change it. Would you recommend adding any treatment to it?
I’m gonna go ahead and change it. Would you recommend adding any treatment to it?
Lead Driver
Joined: May 2011
Posts: 5,776
Likes: 443
ATF is a great cleaner, there is no "seafoam treatment" to the trans that will be better than fresh fluid. If you want to feel better in terms of flushing old crud out, do a complete fluid exchange then do it again after 5,000 miles or so....then rock on for another 50k
Tuned
Joined: Jan 2007
Posts: 338
Likes: 101
From: Salkum
I don’t know if I would do the MERCON V unless I was doing a complete fluid exchange as the first step.
If pulling the pan and replacing the filter, you’re lucky to get 1/3 of the fluid out. At 189k miles and never been changed before, it’s going to be a little gross looking and is going to take repeated draining to get it clean.
While the pan is off, weld in a 1/4” pipe flange if you don’t already have a drain plug. You don’t need to replace the filter every time if doing dump and replace every 5k until the fluid gets clean.
If pulling the pan and replacing the filter, you’re lucky to get 1/3 of the fluid out. At 189k miles and never been changed before, it’s going to be a little gross looking and is going to take repeated draining to get it clean.
While the pan is off, weld in a 1/4” pipe flange if you don’t already have a drain plug. You don’t need to replace the filter every time if doing dump and replace every 5k until the fluid gets clean.
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Hotshot
Joined: Jun 2015
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MERCON V is the replacement fluid for MERCON. If you are going to change almost half of the fluid by dropping the pan you might as well use the good stuff. The truck could either have an AOD or C6. I don’t think my C6 torque converter has a drain plug so you are limited in how much you can change at one time unless you follow Mark Kovalsky’s flush procedure and change it all at once.
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