Welcome to the forum, I’m new here also and glad you asked about the transmission, I’m curious what responses you get. I’ve got a 2020 EB and the owners manual says to change the trans fluid and filter at 150K !! I would think it would be to late because of the risk of fluid shock? Most of my knowledge of vehicles is from the 60’s to 80’s. In the past I would change and replace the fluid and filter at 60K and never again and that’s what I’ll probably do with my 2020.
Ken

 

I read that doing a flush could actually HURT the transmission. IDK how accurate that is. The dealer never recommended trans flush in my trips to them, once my extended warranty expires I will take it to other shops.

It can but it depends on the age and state of your transmission, and applies not only to Mustangs but to other Ford models.
Some specialists say it is better to just drain the trans fluid and replace the filter, but not to do a full flush.
This is because flushing can damage the seals and also the flushing procedure may cause some fluid to move in the opposite direction of normal flow due to eddy currents, which may increase the risk of dislodging debris and causing it to settle somewhere it shouldn’t and changing the delicate gear clearances.
Sometimes a full flush can make an old transmission worse because of this.

Be aware though, that draining the fluid only, does not remove all of the old fluid versus a full flush, so your transmission won't entirely be filled with fresh new fluid.

 

I typically change the fluid in auto transmission vehicles I have every 50 to 60k miles. Just draining the pan is only about one third of the total capacity so I change out all of it.

Here is my process;
1. Drain the pan and change the filter(s). FWIW, my Dodge has two filters, the typical pancake filter and a spin on cartridge filter that looks like an oil filter.
2. Refill the pan.
3. Remove the pressure line to the transmission cooler and put it in a bucket.
4. Start the engine and put it in drive and allow approximately the amount you put in the pan pump out. Shut the engine off.
5. Refill the pan and repeat step 4.
6. Repeat as needed until you see clean fluid cing from the hose.
7. Button the lines back up and top up the pan.

Sent from my moto g(7) using Tapatalk

 

Go Further is correct and I'll add a little bit more. The friction disks in a transmission wear out over time. The friction material on those disks wears off and floats around in the fluid. When you drain the fluid you remove all of those little friction adding particles and it can actually make your transmission slip after the service. This generally does not occur on Transmissions that are serviced during their recommended service interval however, this will generally happen when you have a high mileage car (100,000++ miles or more) and somebody takes it in for a 1st transmission service. That is a bad plan... I never have an auto transmission serviced if it is at 100,000 or more and has never been touched. You are borderline on your mileage but I'd go ahead and get it done now if I were you.

 

100000miles high milage???? I know that everything is built cheap these days but 100000k 20/30 years ago was only just run in surely we have come further than that???

 

100,000 is high mileage ; ) until the the 80’s it was rare to “turn over“ the odometer, nowadays many vehicles make it 200,000+
You know the old saying “they don’t make things like they use to “ is correct, before 1990 vehicles were junk ! We had to work on them every weekend so we could get to work Monday morning : )

Ken

 

Arh Got ya

 

Thanks guys!
I'm definitely getting the transmission service done. I hope all comes out well.

Is the FUEL INDUCTION SYSTEM 100% necessary for these engines?

I pretty sure I had a dealer do it to mine at about 35K mi, cuz I was having idling issues, but it wasnt that.
Long story short, they gave me a discount that day since it is a pretty pricey service...ultimately bc that wasnt causing my issue it didnt fix anything, the car DID feel "smoother", though RIGHT now at 92k mi the car feels smooth, engine wise. I dont have any rough idling. Is it a GOOD preventative service? or just can it wait? I am a little tight on $$$ due to this hole pandemic but I DONT want to disregard my car's maintenance.

 

Tbh with you I think your over thinking it.

I've never done any of that type of maintenance on any of my cars.

Hell I've only changed diff oil once on a 37 year Datsun 260z.

I also only ever changed the oil and filter at dealer recommended intervals. The Skyline recommends you change the cam belt every 10k after the first 100k I think. Yeah na.

I think I've also only ever changed brake fluid once in a 206 in the UK over 10 years ago.

I do however change the spark plugs at 10k or once a year in all my motors.

All my cars are modified all my cars now have well over 100k on them. The Silvia S14 (SR20DET) has over 200k.

Worse thing that's happened to date, snapped manifold studs on the Skyline and rust prevention from the salt on the UK roads, HATED it.

This is my experience with some of my cars over the last 20 years, driven in both hemispheres in both hot and dusty, cold and icey conditions, you however might feel different.

 

Tbh with you I think your over thinking it.

I've never done any of that type of maintenance on any of my cars.

Hell I've only changed diff oil once on a 37 year Datsun 260z.

I also only ever changed the oil and filter at dealer recommended intervals. The Skyline recommends you change the cam belt every 10k after the first 100k I think. Yeah na.

I think I've also only ever changed brake fluid once in a 206 in the UK over 10 years ago.

I do however change the spark plugs at 10k or once a year in all my motors.

All my cars are modified all my cars now have well over 100k on them. The Silvia S14 (SR20DET) has over 200k.

Worse thing that's happened to date, snapped manifold studs on the Skyline and rust prevention from the salt on the UK roads, HATED it.

This is my experience with some of my cars over the last 20 years, driven in both hemispheres in both hot and dusty, cold and icey conditions, you however might feel different.

Thanks, I ended up just getting the FRONT tires aligned, FULL trans fluid exchange/flush, and the regular oil change plus tire rotation. Car feels great!

 

No worries