For the 1999-04 Jeep Grand Cherokee 4.7 automatic transmission filters, there are two. I had pics of this solenoid process but I lost it all on my old computer. I got my filters and ATF +4 fluid from Napa. Here are the Napa filter part numbersOne flat one part number 1-8594 $18 and one round canister type part number 1-8593 $8. I am sure My father owned a '99 with the 4.7L. Put 200k miles on it with minimal maintenance (a starter, radiator, and some brakes) and trailer towing every weekend. That Jeep with good tires was unstoppable in the snow. The 4.7L HO V8 has 265hp while the non-HO 4.7L has 235hp. The 4.7L HO sure makes those WJ's fun to drive. Just take care of your issue the easy way. Since you already have 2 gallons of pure coolant in there, drain about one half of a jug back into one of your empty containers. Buy two gallons of pure distilled water from the store and just pour in 1.5 gallons. Finally you will need to burp/bleed the system from any air pockets. Cakewalk Discussion starter Ā· Sep 14, 2021. My 2002 WJ Laredo (4.7 V8, 4 WD, towing and up-country suspension packages) is coming up on 100,000 miles. Thatā€™s not a typo - thatā€™s 100K. Iā€™ve been getting the oil changed about every 3,000 miles and whatever fixed when itā€™s needed. But Iā€™m curious if thereā€™s anything extra I should do Grand Cherokee. 2004. The engine oil type used on the 2004 Jeep Grand Cherokee is SAE 10W-30 for 4.0 L engines but SAE 5W-30 can also be used. The 4.7L engine uses SAE 5W-30 but SAE 10W-30 can be used as well. If You would like to know the capacity of Your vehicle then it is simple. I picked up an '02 JGC Limited with a 4.7 vin N that #7 intake valve had very slightly kissed the piston. Totally repairable by rebuilding the heads installing seats or using replacement heads. It has 274K miles on it ATM. Now, I also picked up a perfectly maintained well running 02 Vin J 4.7, (HO) with well under 100K miles on it, for very I've always flushed my engines. I use Amsoils recommended procedure with first installing a new filter. This drains oil by approx one qt. then fill with engine flush. Run 15 min at idle. Drain and throw out 15 min used filter. Then install new filter and fresh new oil of your choice. 1968 posts Ā· Joined 2011. #8 Ā· Feb 7, 2017. I found a 4.7 locally with 99k miles for $1,200. I may buy it and swap it in and take some time to properly rebuild my original engine and keep it as a spare. The OEM recommended engine oil viscosity for the 2001-08 Jeep Grand Cherokee and 2007-08 Jeep Commander is listed below: 2001-04 4.7L Above 0 degrees Fahrenheit - SAE 10W-30. Below 100 degrees Fahrenheit - SAE 5W-30. 2005-06 4.7L All Temperatures - SAE 5W-30. 2007-08 4.7L All Temperatures - SAE 5W-20. There are many causes of the P0456 small evap leaks. If youā€™ve found no leaks with a smoke machine test the purge solenoid. Make sure it holds vacuum. Another common failure if the ldp ( leak detection pump) the filter that connects to the ldp pump gets full of dirt. The first will eventually get passed the filter and get into the pump and knQEP.