There's a lady out here in my neck of the woods with a 99 4.7 Limited Quadradrive. She complains that when she is traveling along, with overdrive turned on, when it tries to go into overdrive it "Slams" her back and forth, and wont go. She turns OD off, everything goes back to normal, but she hates the 6mpg.
After changing fluid and filters, solenoid pack, speed sensors, pressure sensor, accumulator plate and springs, the only thing that fixed mine was a transmission rebuild. They determined that there was a broken snap ring in the 2nd prime/4th OD clutch and planetary pack.
Mine acted the same way. It actually downshifted to 2nd gear once for a split second while doing 75mph down the freeway. It felt like I had yanked the emergency brake and them immediately released it. The slamming back and forth is the trans shifting into 4th, back to second, into 4th... If I turned off OD after starting the Jeep, it would shift the first 3 gears fine.
2002 WJ Overland - 4.7HO - 231tc - 6" Clayton - 285/75-16 Cooper STT - ProComp 5129 wheels - Kevin's Offroad Belly Skid and Rock Sliders - JKS Track Bar and Disconnects - ProtoFab bumpers
2000 Laredo 4.7L Selec-Trac. 177K miles, Leather, 245 tires, tow package, crappy CD changer, full size spare, roof cross-rails & sunroof. Changes & fixes: Rear Addco sway bar & greasble bushings, upgraded headlights, upgraded tail lights, new hood struts (replaced 2X), new rear hatchglass struts, new radiator (replaced 3X), new oil pressure sending unit (replaced 4X), 2 new speed sensors, 2 new door lock actuators, new ignition key cylinder, chrome front tow hooks, Mobil 1 Synthetic 5/30, Purolator Pure One oil filter, EBC slotted & dimpled rotors, EBC Greenstuff pads, new front shocks (replaced 3X), new rear shocks (replaced 2X), new IRO steering stabilizer, new timing chain cover, new water pump, thermostat, new thermostat housing, new high pressure power steering hose, Michelin-X radials, new sunroof assembly, new single-piece lug nuts, new exhaust manifold studs & gasket on driver's side, new Durango alternator. Jeepforum.com sticker, Visit cobaltboatsforum.com when you can!