1" phenolic Spacer

 Swapping the transmission fluid on your Stinger.

There  is no way to do a proper flush of the whole system on this platform.   This process is the next best thing aside from pulling the transmission  out and completely draining it, the converter, cooler, lines ect. (We  don’t want to do that)

I  used an actual shop lift, but it would have been easier if I supported  the car with 4 jack stands.  You will need to climb in and out of the  car several times during this process, so the lift was a bit tedious and  sliding under stands is easy.

Get  the transmission at operating temperature, between 122 and 140 deg.   You can use your JB for that, or get a cheap pyrometer, or infrared  thermometer from Harbor Freight. If you’re not using the app, take the  measurement from under the car, drivers side forward of the transmission  pan towards the bell housing.

With  the car running in park, climb under and remove the check plug (see  photo).  It’s OK, you want to see if your low on fluid.  With that plug  removed, the car running in park, you should see fluid slightly dripping  out.  That plug is actually a pipe that goes a few inches up in the pan  and it’s how the level is checked.  Good?  OK.

Put  the check plug back in, shut the car off, climb back underneath the car  and remove the drain plug (see photo).  Fluid is a bit warm.  What  should come out is between 3 and 3.5 ish quarts of old fluid.  Put the  drain plug back in and measure what came out, estimates are fine.

Now  remove the fill plug (see photo). This is an 8mm Allen also.  If you  bought the 1qt squishy bags like I did, the best technique was to use a  3/8 hose about 12” long.  You can push one end of the hose over the  transmission fluid bag nipple, and stick the other end in the fill hole.   Now just tilt and squish the bag until empty.  Put roughly the same  amount in as you drained out. (more, if none came out during the initial  check) Loosely put the fill plug back in.

You’ll  need to warm the transmission back up, shouldn’t take long.  While you  are doing that, sit in the car and run through the gears.  Drive, park,  reverse, drive, park, drive, ect..  With your foot on the brake do this  several times.  All you’re doing is cycling fluid through the whole  transmission.

With the  car running in park, go back under and pull out the check plug.  Is it  dribbling out?  Did you add too much, not enough?  Your goal in the end  is to have fluid dribbling out with the car running in park.

Shut  the car off, climb back under, and pull the drain plug out.  Again, you  should loose about 3 to 3.5 qts.  Put the drain plug back in and go  through the fill process again.  Keep doing this until you run out of  new fluid!

If you only  wanted to drain 2 qts at a time that is fine, just remember to start the  car, cycle through the gears and check it in park with the car running.

At the end of this, if you don’t have fluid dribbling out the check plug you don’t have enough fluid in!