oldmustangjunkie
NAXJA Forum User
- Location
- Wartburg, TN
I just bought a 99 Cherokee with 178K miles. It is in great condition! I want to replace all the fluids and do a tune up before I start modifyinng it. I need to know what kind of fluids to use. I read that the trans and tranfer case both use Mercon/Dexron 3. Is there a better fluid that I can put in it? Also, do you use what weight of gear oil do you use? I saw some folks saying they used 70w140 for offroading and towing loads. I would like to get synthetic fluids for the trans, transfer case, and diffs if possible. Mobil 1 and Royal Purple are readily available around here. What plugs do you recommend for my motor? I generally use whatever the factory put in on a stock application, but if there are plugs that give more performance or mileage, I'll get them. The Jeep has a fuel filter and 02 with around 10K miles on them, so I'm good to go there. If I am forgetting anything, let me know and I'll pick it up too.