stock wk crd ltd:  245/60 R 18  = 29.57471 inches

Plus Zero 225/65-18 235/65-18 255/60-18 
Plus One 235/55-19 245/55-19 255/55-19 265/50-19 
Plus Two 235/55-20 245/50-20 255/50-20 265/45-20 265/50-20 
Plus Three 265/40-21 265/45-21 
Plus Four 265/35-22 265/40-22
from:  http://www.discounttire.com/dtcs/tirePlusSizes.do?v=012592|2008&r=WASINT|pc|98204

stock wk crd ltd:  245/60 R 18  = 29.57471 inches

285 50 18 	29.22
255 55 18 	29.04
275 55 18 	29.91
305 55 18 	31.21

235 60 18 	29.10
# 245 60 18 	29.57
265 60 18 	30.52   3%
275 60 18 	30.99
285 60 18 	31.46
315 60 18 	32.88  10%

from: http://www.jekylhyderacing.com/HeightofTires.htm (nuking anything less than 29.5")


2008 Jeep Grand Cherokee SUV (base engine:  4.7L V8 FFV 4x4 5-speed Automatic)
Vehicle Model year	2008
Make	Jeep
Model	Grand Cherokee
Style	Limited 4dr SUV 4WD (base engine:  4.7L 8cyl 5A) Base MSRP	$39,305
Options on test vehicle	Jeep Green Metallic Clearcoat Paint, Quick Order Package 22H
As-tested MSRP	$41,055

Drivetrain Drive type	Four-wheel drive with low-range transfer case
Engine type	V6 Turbodiesel
Displacement (cc/cu-in)	2987 / 182.3
Block/head material	Cast-iron/aluminium alloy
Valvetrain	Single overhead camshaft
Compression ratio (x:1)	18.1
Redline (rpm)	4500
Horsepower (hp @ rpm)	215 @ 4,000
Torque (lb-ft @ rpm)	376 @ 1,600
Transmission type	5-speed Automatic
Transmission and axle ratios (x:1)	I = 3.59, II =2.19, III =1.41, IV =1, V =.83 FD = 3.73:1, R =3.16, Low = _.___
Suspension, front	Independent, Double Wishbones, Coil Springs, and Stabilizer Bar
Suspension, rear	Solid Axle, Leaf Springs, and Stabilizer Bar
Steering type	Speed sensative, hydraulic-assist power steering
Steering ratio (x:1)	15.8:1-on center
Tire brand	Goodyear Tire model	Fortera H/L
Tire type	All terrain
Tire size, front	P245/65R17 105S
Tire size, rear	P245/65R17 105S
Wheel size	17 X 7.5 front - 17 X 7.5 rear
Wheel material	Aluminum alloy
Brakes, front	12.9-inch ventilated disc
Brakes, rear	12.6-inch solid disc
Track Test Results
0-45 mph (sec.)	4.8
0-60 mph (sec.)	8.0
0-75 mph (sec.)	12.8
1/4-mile (sec. @ mph)	15.9 @ 83.8
0-60 with 1 foot of rollout (sec.)	7.8
Braking, 30-0 mph (ft.)	36
60-0 mph (ft.)	140
Slalom, 6 x 100 ft. (mph)	58.2
Skid pad, 200-ft. diameter (lateral g)	0.74
Sound level @ idle (dB)	48
@ Full throttle (dB)	74.4
@ 70 mph cruise (dB)	67.3
Test Driver Ratings & Comments
Acceleration comments	Pretty stout launch thanks to all that torque, but the low redline means 
it's over quickly and the transmission needs to upshift to the next gear at about 4,000 rpm. 
Still, I enjoy the stern shove of a turbodiesel.
Braking rating	Poor
Braking comments	Not very confidence-inspiring from either the standpoint of its mushy pedal 
or dramatic dive. While the distances didn't grow much from first to last stop (hovering around 140-145 feet), 
that distance isn't particularly good in this era of car-based CUVs that regularly halt from 60 in the 120-130 range.
Handling rating	Average
Handling comments	Despite a non-defeat stability control (regardless of what the button and light 
indicate), tire-torturing understeer is the ultimate limit on the skid pad. Steering is very light 
regardless of load. Also, it was hard to maintain a steady speed because of the turbodiesel's lack 
of throttle response ? very elastic feeling. In the slalom, light steering masks the heavy curb weight 
only for so long. This test shows how soft the suspension is and how massive this Jeep really is. 
Stability control system limits the vehicle's performance but I wouldn't want it any other way.
Testing Conditions
Elevation (ft.)	1121
Temperature (°F)	73.6
Wind (mph, direction)	0
Fuel Consumption
EPA fuel economy (mpg)	17 City / 22 Highway
Edmunds observed (mpg)	19.3 for 900 miles
Fuel tank capacity (U.S. gal.)	22
Dimensions & Capacities
Curb weight, mfr. claim (lbs.)	4,691
Curb weight, as tested (lbs.)	4,723
Weight distribution, as tested, f/r (%)	55 / 45
Length (in.)	188.0
Width (in.)	72.6
Height (in.)	68.7
Wheelbase (in.)	109.5
Track, front (in.)	62.0
Track, rear (in.)	62.0
Turning circle (ft.)	36.7
Legroom, front (in.)	41.7
Legroom, rear (in.)	35.5
Headroom, front (in.)	39.7
Headroom, rear (in.)	39.3
Shoulder room, front (in.)	59.1
Shoulder room, rear (in.)	58.4
Seating capacity	5
Cargo volume (cu-ft)	34.5
Max. cargo volume, seats folded (cu-ft)	68.5
Bumper-to-bumper	3 years / 36,000 miles
Powertrain	Unlimited
Corrosion	5 years / 100,000 miles
Roadside assistance	3 years / 36,000 miles
Free scheduled maintenance	Not available
Front airbags	Standard
Side airbags	Standard dual front
Head airbags	Standard front and rear
Knee airbags	Not Available
Antilock brakes	4-wheel ABS
Electronic brake enhancements	Braking assist, electronic brakeforce distribution
Traction control	Standard
Stability control	Standard
Rollover protection	Standard
Tire-pressure monitoring system	Direct tire pressure monitoring
Emergency assistance system	Not available
NHTSA crash test, driver	5 stars
NHTSA crash test, passenger	5 stars
NHTSA crash test, side front	Not tested
NHTSA crash test, side rear	Not tested
NHTSA rollover resistance	4 stars
Quadra-Drive II

The Quadra-Drive II Jeep 4 x 4 system offers owners the ultimate in off-road capability. 
It combines the NV245 full-time transfer case with Electronic Limited Slip Differentials (ELSD) 
for best-in-class tractive performance. The system instantly detects tire slip and smoothly 
distributes engine torque to the tires with traction. In some cases, the vehicle will even 
anticipate low traction and adjust to proactively limit or eliminate slip

The heart of the system is the NV245 active transfer case. This transfer case includes a center 
differential coupled with an electronically controlled clutch pack, varying it from a completely 
open state to completely locked, and infinite possibilities in between. The 4-Low gear ratio is 2.72:1.

Quadra-Drive II features an electronic shift mechanism with a unique engagement lever. The lever is 
conveniently located on the shift console. Pulling the lever up engages 4-Low. The lever returns to a 
resting position after activation. The transfer case also includes a neutral position for trouble-free 
towing vehicles, such as behind a motor home.

A key component in the Quadra-Drive II system is the ELSD – an industry first application – and the 
new benchmark for automatic traction differentials. The ELSD use electronically controlled clutch 
packs to automatically and instantly vary from slip to lock at each axle. This maximizes traction 
when needed without any of the on-road drawbacks normally associated with such a robust 4 x 4 system.

All components of the system work together, continually monitoring needs, to provide smooth and 
automatic application of the components for best-in-class tractive performance while improving 
the day-to-day on-road driving experience. For example, the ELSD releases the clutch packs in the 
front axle during turns to allow differentiation and prevent crow hop.

Eaton ELSD
Rear axle ELSD. The Eaton EGerodisctm is a hydraulically-operated electronically controlled 
limited slip differential that is capable of providing variable torque up to full axle lock

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