Transmission Fluid Change? - Ford Powerstroke Diesel Forum
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Old 03-08-2012, 04:16 PM
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Transmission Fluid Change?

I bought my truck with 78,000 miles on the odo, and without looking at the scheduled maintenance log I assumed that the previous owner had gotten the ATF changed every 30,000. I've done all my own maintenance and fluid/filter changes since I bought it, but I can't change what was or wasn't done to it prior to my purchase.

Now, as I have been pouring over the maintenance log, I'm not sure that it's ever been changed (currently I'm around 87,000 - about to be at the 3rd interval). Mechanic tells me if I'm not sure it's been changed yet, I should just see how far I can go without having any issues. The dealership service tech (I wanted a second opinion) told me to change it, it wouldn't hurt anything. I can't take him too seriously though, because he was adamant about me using Gold coolant - even though I didn't ask for his opinion on the matter.

It seems like there's a group of people that recommend just dropping the pan, and filling up the system with 4 or 5 qts. Others seem to think a full out flush would be fine. So now I'm coming to you all to see what you think. I don't like the idea of riding out my transmission till its death, but I also don't want to speed that up by doing something that will hurt it.

As always, thanks for the help.
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Old 03-08-2012, 07:25 PM
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Just change it!
Cheap insurance and peace of mind.
If you do change it yourself, i recommend pulling the pan to inspect the magnet. And the filter too
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Old 03-08-2012, 07:40 PM
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I have done both (dealership did the flush, I did the drain and fill) - either way is fine.

Last edited by bismic; 03-08-2012 at 08:00 PM.
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Old 03-08-2012, 07:47 PM
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Look at my sig.
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Old 03-09-2012, 03:48 AM
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As a start, get a sample analyzed at a laboratory:
Blackstone Labs
Predictive Maintenance Services, Inc.
Oil Analyzers, Inc. - Oil Analysis, Oil Testing Services
Each of these labs (or an over-the-road truck service center where the analysis will be performed while-you-wait often) provides an objective measurement of contaminants and wear products as well as examination of the viscosity and (in the case of the Blackstone) a comparison to universal averages from other similar components. This analysis will help you to determine if the fluid has been neglected or if the component is in ordinary or out-of-tolerance wear.

Knowing the condition of your used fluids goes a long way to avoiding component failures.

Jonathan
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Old 03-09-2012, 09:37 AM
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Quote:
Originally Posted by smokersteve View Post
Look at my sig.
Excellent write-up. I really appreciate it.

Everyone else, thanks. I think I'll run a sample first (as howell said) to see if that will steer me one way or another. But thank ya'll very much.
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Old 03-09-2012, 12:46 PM
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First flush was done by Ford. I need to do a 2nd change but that will be done by me.
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Old 03-09-2012, 03:09 PM
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At 87k without knowledge if was ever done take it to a trans shop that can do a full flush.
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Old 03-13-2012, 01:48 PM
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Quote:
Originally Posted by smokersteve View Post
Look at my sig.
I was reading your writeup. Did I read correctly that you started the truck and let it idle for 5-10 seconds AFTER you drained and dropped the pan?
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Old 03-13-2012, 02:00 PM
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My local Ford dealer said they would do the flush for $199 which includes external filter change. I am sure mine will be slightly higher as I have a Mag-Hytec Pan. Service guy said an extra $175 to change out internal filter. Truck hasn't had a tranny oil change since I put the lager pan on. That was over 50k miles ago. Does this seem fair? Or should I get the flush then change the internal myself and add the extra oil that I will loose?
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