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'99 & up 7.3L Power Stroke Engine and Drivetrain FAQ Frequently asked questions in the '99 & up 7.3L Power Stroke Engine and Drivetrain forum.

Thread: Changing ATF: 7.3L PowerStroke Engine and 4R100 Automatic Transmission. Reply to Thread
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  Topic Review (Newest First)
08-23-2018 06:40 AM
ArcticDriver A couple things about the 7.3:

—Genuine Motorcraft Electrical parts & Sensors seem to hold up better than after-market and are worth the extra cost.

—The HEUI system seems to be tough on oil so most of us practice more frequent oil changes than the Owners Manual suggests. For example, a full synthetic 5w-40 usually has no more than a 6,000-mile OCI (oil change interval).

—The Ford FL-1995 oil filter is a well constructed filter and as good as the competition for $10 at most auto stores and WalMart.

—Many of us keep a spare CPS in the glove box with a 10-mm wrench. It isn’t so much that they are prone to failure but they are a common fail point and one that is easily replaced roadside and inexpensive to keep a spare ($40).
08-23-2018 03:12 AM
ArcticDriver Congrats on the low miles 7.3.
A couple things that would affect shift points:

Do you know if it has a non-factory transmission?

Do you have a chip or tuner or is it stock?
08-23-2018 02:20 AM
Hi All,
I'm new to the ford world as I have owned rams for the last 14 years. I find myself a proud owner of a 2001 ford F-350 dually with a 7.3. I have a few questions.
1. when I drive it , shift points seem rough like they are slamming home. Is this normal? Truck has 156,000 miles on it.
It is a 4x4, in really nice condition, just replaced the glow plug wiring harness. What other issues might I be looking at.
Thanks
08-02-2018 08:16 PM
Mark Kovalsky
Quote:
Originally Posted by JGH# View Post
Mark, do you suggest just doing the exchange through the line on the back of transmission like the normal process then...
Yes, I do.
08-02-2018 08:08 PM
ArcticDriver
Quote:
Originally Posted by JGH# View Post
Quote:
Originally Posted by jleedog View Post

Get yourself a Scangauge II for about 150$ it will monitor trans temp and many other things and the install is plug and play.
Thanks will look for it!
Cheapest source for ScanGauge-2 is Advance Auto and you save 20% by ordering online. Plus you earn $20 cash perks for future purchase.

It is plug & play but you need to allow about 30 minutes to program in the various PIDs you wish to monitor.

Best money I ever spent.
08-02-2018 04:35 PM
JGH#
Quote:
Originally Posted by jleedog View Post

Get yourself a Scangauge II for about 150$ it will monitor trans temp and many other things and the install is plug and play.
Thanks will look for it!
08-02-2018 04:23 PM
jleedog
Quote:
Originally Posted by JGH# View Post
Yes have a drain plug... already drained...we are replacing filter... hopefully transmission isn't on it's way out...trans would get hot going up mountain with a large travel trailer...
We get a lot of information from this site to make sure we are doing things right...

Mark, do you suggest just doing the exchange through the line on the back of transmission like the normal process then...It seems like it would be easier...🤔 This 2003 Excursion has 260,000 miles on it. I love my truckn, but it has started showing the age a bit. Everyone wish us luck or a few prayers this helps resolve some of the trans cooling problems towing in mountains...
Suggestions for trans gauge? Only have the original dash gauge would like to see temps.

THANKS FOR THE HELP! I am very grateful
Get yourself a Scangauge II for about 150$ it will monitor trans temp and many other things and the install is plug and play.
08-02-2018 04:14 PM
JGH# Yes have a drain plug... already drained...we are replacing filter... hopefully transmission isn't on it's way out...trans would get hot going up mountain with a large travel trailer...
We get a lot of information from this site to make sure we are doing things right...

Mark, do you suggest just doing the exchange through the line on the back of transmission like the normal process then...It seems like it would be easier...🤔 This 2003 Excursion has 260,000 miles on it. I love my truckn, but it has started showing the age a bit. Everyone wish us luck or a few prayers this helps resolve some of the trans cooling problems towing in mountains...
Suggestions for trans gauge? Only have the original dash gauge would like to see temps.

THANKS FOR THE HELP! I am very grateful
08-02-2018 03:53 PM
Mark Kovalsky
Quote:
Originally Posted by JGH# View Post
?#1 First add 8 qts new fluid?
Yes.
Quote:
Originally Posted by JGH# View Post
?#2 Then hook up clear line to ? so nothing clogs the new 7.3 mishimoto cooler?
If you don't want to run the old fluid through the new cooler, don't remove line at the rear of the trans. Remove the line at the new cooler that comes from the radiator cooler to the new cooler.
Quote:
Originally Posted by JGH# View Post
?#3 We are in summer so the trans. isn't cold but it's not at operating temp because it was yesterday we did the 7.3 trans install, and today we will exchange fluid. Does that matter that it's not operating temp?
It does not matter. The trans does not need to be warmed up to do this.
Quote:
Originally Posted by JGH# View Post
And the fact I am hoping nothing gets clogged anywhere.
The only way the cooler could clog is if the transmission has already totally failed.
08-02-2018 02:32 PM
jleedog Follow the directions In post 1 and you will have no problems. Do you have a drain plug? Are you replacing the filter?
08-02-2018 12:22 PM
JGH# Installed the mishimoto 7.3 cooler now we need to exchange transmission fluid in the system. When taking out the old cooler and putting this new one in and draining the trans. pan altogether it drained out about 2 gallons (8 quarts) so now we need to exchange fluid after the new 7.3 install...there is not a magna. filter on any line.. we have to do this later as we are crunched for time (gotta finish this in a couple hours going camping pulling a big travel trailer in mountains tomorrow). So the teams fluid is a brown red. Definitely time for a change. My question is do we add all 8 quarts then still take off the line in the back return by transmission and add the clear line to bucket. I really didn't want to clog the brand new cooler with old fluid if possible. We bought the synthetic Mobil atf as our trans gets hot pulling in mountains. I don't know what fluid was in it before. Or do we pull off the line somewhere up by the cooler to hook the clear line that goes into bucket?
?#1 First add 8 qts new fluid?
?#2 Then hook up clear line to ? so nothing clogs the new 7.3 mishimoto cooler?
?#3 We are in summer so the trans. isn't cold but it's not at operating temp because it was yesterday we did the 7.3 trans install, and today we will exchange fluid. Does that matter that it's not operating temp?
I'm helping my husband do all this work and if someone could help me get this step by step, I really appreciate it. I read the post at top and it all makes sense except we drained an extra quart+ a little more because of the new 7.3 cooler install. And the fact I am hoping nothing gets clogged anywhere. Thanks you so much for your time and helpful posts!
07-23-2018 01:33 PM
ArcticDriver That sounds like an inconvenient location...I usually see these inline filters installed in an easily accessible area that allows for 5 minute swaps.

Thanks for that follow-up.
07-23-2018 11:25 AM
N_E_T_O
Success and Done!

Just an update here..I finally finished my trans fluid flush/change following the instructions at the beginning of this thread. I went from the old Mercon fluid that had been in there for about 28,000 miles or so, and changed it all over to Mobil 1 sythetic ATF. Here are some observations that might help others in the future:

1. I premarked my drain buckets with quart increments so that I would know how much fluid I was pumping out each time, and when to turn the truck off. This helped a lot. And along those lines, have plenty of them to pour the fluid into, etc.

2. I changed the Magnefine filter BEFORE doing the fluid change so as to not lose any of my expensive Mobil 1 Synthetic fluid after the fact. Turns out very minimal fluid loss for magnefine filter change. Also, I did open the magnefine up, and found that it was not very dirty at all, and no chunks of anything, etc. Very happy about that.

3. Of 20 quarts of Mobil 1 Sythetic ATF, I ended up with just 1/2 quart left over after the flush, fill and top off.

My truck has always had, for lack of a better way of describing it....a "shudder" when starting off in first gear always. After the fluid change, I was happy to see that this "shudder" is now extremely minimized and might even be gone completely. Everything else seems about the same. Haven't towed with it yet. Took me about 1 hour (not including the magnefine, which took an hour by itself as I have to remove my lower front bumper guard to get to it) from start to finish with my wife helping me in the drivers seat.

Thanks for all the tips and help!

Randy
07-10-2018 05:54 PM
jleedog You don't have to cut Magnefines open to see inside. 2 pairs of channel locks will take them apart because they now are 2 piece and threaded together.
07-09-2018 11:27 PM
ArcticDriver Every time I have changed my Magnefine, only a tablespoon or so drips out of the line.

If you cut the old one open to inspect the magnet & paper filter then I hope you will post pictures.

BTW, was your new Magnefine the old black style or the new steel casing?
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