6402 posts · Joined 2009. #2 · Jun 11, 2012. If they don't use an HO engine, they'll have to swap wiring harnesses and PCMs, as the standard 4.7 doesn't have the 2 knock sensors. To triple check, there will be "H.O." in the casting of the heads. H.O. 4.7 didn't appear until 2002, and wasn't put in anything beyond the 2004 WJ to my knowledge. 2001 Grand Cherokee Limited- 4.7L and "Select-Drive" (A.K.A "The Sleigh")--Airaid Jr. Intake, Trans-Go Shift Kit, 3" Exhaust with FM70, 247 to 242HD Swap, 4" IRO Long Arms, 255/70R17 Toyo OC AT II's, Rubicon Wheels, Fuel Rail Modification, Upgraded Injectors, HO Cam Swap, JCR Stage 3 Sliders, Hood Louvers, HIR High/Low Beam Bulbs, D30 True-Trac, Upgraded Primary Wiring, Front/Rear Winch there is a keene bell superchagers kit made specifically for the 4.7. check out Jeep Grand Cherokee WJ - Performance and Power. Reply Quote. overlandchris Discussion starter. 339 posts · Joined 2009. #5 · Mar 31, 2010. Correction They Used too. they stopped making it a few years back because of lack of demand. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Jeep Grand Cherokee 4.7 V8 H.O. Overland in 2004, the model with 5-door sport-utility wagon body and V-8 4701 cm3 / 287 cui, 190 kW / 258 PS / 255 hp (ECE) of power, 425 Nm / 313 lb-ft of torque, 5-speed automatic powertrain for Europe . Specifications listing with the performance Grand Cherokee with the 4.7L engine replaces both. the electric fan and the engine driven mechanical. fan. The use of this hydraulic fan provides the 4.7L. equipped Grand Cherokee with heavy trailer tow. capability while at the same time reducing unnecessary. power drain on both the engine and the vehicles. Jeep Grand Cherokee & Commander Forums. WJ Grand Cherokee Forum. 2002 4.7 HO Overland Exhaust. Jump to Latest Follow 2003 WJ Overland 4.7 H.O. Hi. I have a WJ 2004 Jeep Grand Cherokee Overland 4.7 litre HO V8. It has recently began surging in the engine revs both at idle and when driving. For example, at a normal engine idle the revs will continually increase and decrease upwards of 700 RPM to 1300 RPM and back down again to the normal idle RPM of about 600 RPM. 1999 Jeep Grand Cherokee Laredo 2002 WJ Overland - stock 1978 CJ5 - 350, 34's (2000 Durango and 2004 WJ) and two 4.0's (Renix 1990 XJ and "HO" 1996 XJ). All ZDuSh7.