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PASmokeater, here is a quick shimmy of the hierarchy. (my family is from York, PA. I'm in Charleston, SC, now, that's why I'm helping you.) Ok here we go... Basically the newer Jeep always initiates the wave unless the newer jeep has more Modifications, i.e. lift, racks, knobby tires, grill guards, louder engine, etc. Since you have a 99, you should almost always initiate the Wave. I have an 89, with a lift, over-the-roof rack, and off road lights, therefore I have to determine if I'm the Waver or the Wavee. When in doubt, just Wave! It's fun.
Here's a basic way to tell the Jeeps apart. 97 and newer (the TJ) have round headlights AND sidemarker likes in the fender. 87-91 have square headlights and a downsloping rear rollbar, 92-95 are the same as 87-91 except they have the full rollbars that go back to the upper corners before re-joining the Jeep tub... same rollbar as yours. 87-95 are called YJ. Wranglers were not made in 96. CJ can denote many different Jeeps. It stands for Civilian Jeep. The CJ's all have round headlights with the sidemarker lights on the grille, unlike yours. CJ-7s have a U shaped lower door frame, CJ-5s have the S shaped lower door frame. CJ-8s are the same as CJ-7s but they have a longer wheelbase and longer "bed".
Well, I guess that wasn't short, but hopefully you'll take something from it. Welcome to the Fleet of the Elite... Jeeps!
ps. tell your state Congratulations on rescuing those miners!
[addsig]