Have a Jeep dealer decode your VIN, they can tell you which one your vehicle was equipped with. If you can't keep it in full-time, there is a problem with the 4WD switch that might need to be remedied. Pulling up on the lever and holding in the full-time position should cause full-time to engage with a short drive (10-15 feet). There should be 3 wires running from the center connector on the Transfer case. Check if it is unplugged, damaged. If there is a hookup that doesn't fit, then it was probably swapped in for the 231. Good thing is that there is a cable jumper that can be purchased to plug into the harness to convert it. I swapped out my Full time case for a part wb fisher Discussion starter. 2 posts · Joined 2009. #1 · Nov 19, 2009. A few weeks ago I shifted my 2004 Jeep Grand Cherokee 6 cyl. to full time four-wheel drive on my driveway. So now my jeep is in two wheel drive but the dash light says it is in part time four wheel drive. When I shift to part time four-wheel drive the part time light goes View detailed specs, features and options for the 2011 Jeep Grand Cherokee 4WD 4dr Overland at U.S. News & World Report. Quadra Trac I is a full-time four-wheel-drive system that was introduced in the 1976 Jeep Cherokee. The four-wheel-drive system worked whether it was dry or snowy. In 1999, Quadra Trac I was replaced by Quadra Trac II’s four-wheel-drive system that had many improvements like a two-speed transfer case, neutral button, and a center differential The Jeep’s similarly sized crossover competitors generally offer superior on-road ride and handling, but any 4WD Grand Cherokee will be able to travel further off the beaten path. The Jeep also The Grand Cherokee SRT® and Trackhawk use a full-time 4x4 system for superior driving performance in any condition. The strongest transfer case ever designed by the Jeep® Brand handles massive amounts of horsepower and torque produced by the mighty 6.4L V8 engine or the Supercharged 6.2L V8 engine. SdrDUlK.