1998 Plymouth Grand Voyager 3.0 Liter engine. $

In owners manuel or goggle

if you follow the pipe does it go towards the transmission ? if so it's for the trans cooler. If not it will be the escape hose incase of overheating/to much pressure in the coolant system , if you go to a parts retailer like autozone they will have the part named on their data system , its a bit difficult without seeing vehicle to name parts . although you have given a good description, the lower rad hose carries cooled coolant so i would think it's the trans cooler but check at autozone or similar

sorry it's different

maybe / maybe not, really depends on numbers and design level of builds between vans.
Parts Information OEM Part # Price Engine Control Module ECM 4 Speed Federal 4727153AJ $599.00 Order By Description. California 4727154AJ $819.00 Order By Description.

TO CHANGE THE FLUID YOU HAVE TO REMOVE THE TRANSMISSION OIL PAN IF YOU DO SO ADD 4 QTS BEFORE YOU START THE ENGINE THE YOU CHECK IT WITH ENGINE RUN TRANSMISSION IN NEUTRAL ADD UNTIL FULL YOU FILL IT FROM THE DIPSTICK TUBE THAT IS IN THE FRONT NEXT TO THE BATTERY TRAY

1999 Plymouth Truck Grand Voyager 2WD 3.8L MFI 6cyl
* The Vehicle Speed Sensor is located Mounted on transmission
* The Sensor - Transmission Speed is located Mounted on transmission

Hope this help (remember comment and rated this).

yes

You need to remove the filter.(It's the bid flat metal piece that you see with 1 or 2 screws holding on)

Where did you have it done, and are you sure they used Genuine Mopar ATF4 tarnsmission oil to refill it? If they tell you it doesn't matter, then they don't know what they are talking about.

You have a shorted engine harness, this is not common but it does happen, heat and engine movement cause damage to the harness, this is most common on hi miler cars and vans, the only way to fix it is to start by looking anywhere the harness rubs, that is where the damage occurs.