Transmission Service Done Today, No More Shudder

ViiiKiller

Registered
I finally got around to changing out my transmission fluid and filter today. It was fairly easy, especially once all four wheels were off the ground. I tried jacking the fronts only but it did not seem high enough. I used 11.5 total quarts of Mercon V, 8.5 of which was Coastal Mercon V and 3 quarts of Castro Mercon V. The filter was a Duralast from Autozone which came with a new rubber pan gasket.

Before the trans service, I would get a bad shudder that felt like driving over rumble strips. Now, its shifting nice and smooth, however, once in awhile it'll do a slight shudder.

I found a weird looking plastic part with an O ring at the bottom of my pan and could not figure out where it went. Could somebody help me figure out what this little plastic piece is, I took a picture of it. I also believe the 1-2 accumulator piston has been changed but not 100 percent sure. I think I remember reading that the original piston was a machined piece of aluminum. The one in my trans looks like the stamped steel unit that you're supposed to order. What do you think of my assumption?

The "good stuff" Mercon V

SH102364.jpg


What is that little plastic thing in the bottom of the pan with the extremely dark and smelly trans fluid?

SH102366.jpg


Make sure you remove the old gasket or O ring from the transmission before installing the new filter. I had to use a screw driver to carefully pry it out. I am pointing at the new O ring that comes with the new filter.

SH102368.jpg


Hope this is the new improved steel piston and spring assembly installed already.

SH102370.jpg


Getting ready to reinstall the 11 mm bolt into the torque convertor. A lot of fluid came out of that thing. I didn't get rained on, but my poor drive way sure did when the pan came down somewhat crooked.

SH102371.jpg
 
That plastic plug is what the factory uses to seal the dip stick tube hole in the tranny. It just gets shoved in the pan during assembly of the car. Which means that the pan on your transmission probably hasn't ever been off before.
 
Props for the DIY job! :)

The plastic piece is a plug the factory used for the dipstick hole. When the dipstick is put in, the plug is pushed into the pan. Basically that means the pan has never been off!

Hard to say about the 1-2 accumulator without it being taken out.

The OEM pan gasket is designed to be reused.

It may take a few hundred miles for the TC clutch to become fully acclimated to the new fluid.
 
Thank you guys, I'm so glad it wasn't an important part. However, I wonder if that means this was its first trans service at 109K miles. The trans shifts really nice and smooth and not lazy.
 
...and as you drive it for the next 200 miles, that little shudder you experienced will "probably" go away too.....
 
...and as you drive it for the next 200 miles, that little shudder you experienced will "probably" go away too.....

You're so right Bud, its been shifting very nice and smooth, but maybe once every 10 take offs from traffic lights or stop signs, it'll do a little shudder. However, no where near as rough as before like running over rumble strips.
 
You found the "cherry"! :D

Looks like you were able to stay clean but you made a mess of your driveway....thats the tell of a good mechanic. Good work!
 
OK, today I drained all the fluid including the tq converter. As I was refilling thru the dip-stick on or about qt 9 tranny fluid started to overflow and come out the the dip-stick tube :-( Of course I didn't catch it until about 1/2 a quart was all over the garage floor. My question is simple, do I need to run the car so some of the fluid will get pumped into the tq converter and thru the rest of the tranny? Then top it off before driving or what?

I'll go back to the garage while and clean a little while I wait for a reply..........
 
Start the car. With parking brake applied and while depressing the brakes, move the shift lever through all positions stopping a few seconds in each position. Return to park, again stopping in each position for a few seconds.

With the car idling in park, check the fluid level. Top off as required.

If it still shows overfull, you're faced with removing some fluid.

Generally after a tranny service, I measure the fluid removed. I then will put in half the fluid quantity removed and do the above procedure. Then put in half of what I think will fill it from there and repeat, each time putting in half as much as before, until you are putting in less than 1/2 quart. I've found that to be the best way to prevent overfilling.
 
Hey Diller, I removed approx 11 qts. I guess I should have ask first, knowing all that fluid had to go somewhere ;-)
 
Same as changing your engine oil AND filter.....If you don't start the engine after you've added all the oil, it will show a quart high!
 
Back
Top