I got bit by the off-road 4x4 bug. Here are some general and Isuzu Trooper related links for Joe Samek and other afflicted folks

Off-road parks/classes - need proper places to wheel
www.ironrangeoffroad.com  - Off-Road drivers course in MN
www.dnr.state.mn.us/ohv/iron_range/  - Iron Range OHV Recreation Area by Gilbert, MN
www.miscjunk.org/mj/mp_mnohv.html - OHV mapping project
www.dnr.state.mn.us/ohv/  - MN Off Road Vehicle ORV info

Online communities/forms and technical reference
www.treadlightly.org essential outdoor ethics
www.planetisuzoo.com  - fun and info - also see the wiki
www.mwior.com/ - Midwest Isuzu Offroad form
www.4x4wire.com/isuzu/  - fun and info
www.isuzu4x.com  - fun and info
www.4xforum.com  - 4x4 Driving Skills
www.mn4wda.com  - Minnesota 4 Wheel Drive Association
www.nsw4x4.com/forum  - Northern Minnesota's Trail Riding Forum
teammudd.tripod.com   - MN Team M.U.D.D. Inc. 4X4 club

tad.grosvenor.org/gallery/Isuzu_Ads - Isuzu Ads
isuzu.off-road.com - WomBAT project
troopers.seanweems.com - fun and info
home.earthlink.net/~nursecapper fun and info
tad.grosvenor.org/gallery/MotorSports RS pics!
www.fotograaf.com/trooper/  - fun
www.automotiveforums.com/vbulletin/f743/  - Isuzu form
www.2carpros.com/forum/6-vf11.html?start=250&topicdays=0  - Isuzu repair questions
forum.australia4wd.com/index.php?showforum=18  - Isuzu form
d.webring.com/t/ISUZU-RING - Isuzu web ring
www.totalescape.com/Amigo/text/trooperFAQ.html  - good trooper FAQ
www.carprices.com/used_vehicles/1989/Isuzu/Trooper/RS/index.html  - Specs & Options info
http://www.zitog.com/ - Mirror of original ITOG site
forums.delphiforums.com/itog/messages - ITOG's forms
ITOG Trooper VIN info and Isuzu Option Code info

www.skidplate4x4.tripod.com/The_Breakover_Angle_explanation.htm  - angles explained
www.discountedwheelwarehouse.com/Vehicle_Bolt_Pattern_Reference.cfm - wheel bolt patterns
www.tirerack.com  - good tire options locator
www.miata.net/garage/tirecalc.html  - tire size calc
www.tirepackage.com  - good tire locator (1st gen trooper max 32x11.50R15 w/out trimming)
  SS-TSAM-44R Super Swamper Radial TSL ~ $480
  BFGoodrich All-Terrain T/A ~ $525
  M/T Baja Radial MTX ~ $540
  M/T Baja ATZ Radial ~ $560
  Walmart ~ $50 (each mount/balance/stem/disposal $3.50/$1.75/$1.50)

Isuzu Trooper and 4x4 upgrades options
www.independent4x.com  - very good upgrade options! What I did so far:
  Aussie Locker - ISUZU 10 Bolt FRONT DIFF ~ $350
  Aussie Locker - ISUZU 12 Bolt REAR DIFF ~ $370
  1.5" SUS LIFT ~ $200
  1" or 3" Body Lift ~ $200 (still thinking about this one)
   REAR - INDY4x LIFT SHACKLES & REAR SHACKLE BUSHING SET
   FRONT - TORSION BAR ADJUST WITH BALL JOINT FLIP & 1/4" SPACER
   CUSTOM BUMPSTOPS
   POLY END LINK KIT & SWAY BAR BUSHINGS
www.rocky-road.com/trooper.html  - upgrade options
www.pureisuzu.com/84-91_2_lift.htm  - Calamini 2" lift for 1st gen
www.4by4connection.com/allistroopwi.html  - rear spring options
 OMEROD11  REAR LEAF SPRING - .75" LIFT ~ $250.00
 OMECS028R Dakar Rear Leaf Spring ~ $120
www.fasterthanthem.com or www.adamsdriveshaft.com - Powertrax 3111 front locker (discontinued)
www.reiderracing.com  - PG Power Brute clutch style limited slip
 LOM14-11 REAR for 2.6L/V6 WITH SPACER ~ $370
 LOM14-12 REAR for 2.6L/V6 WITHOUT SPACER ~ $360
 TL14-4 FRONT for 2.6L/V6 WITHOUT SPACER ~ $265
www.drivetrainspecialists.com  - ARB Air Lockers
  ARB RD-44 or ISU/ARB Rear ~ $750
  ARB RD94 Front ~ 750
  ARB RDCKA pump ~ $215
  ARB PUKT pump hose option ~ $45

www.northerntool.com  - Good idea off-road items
  Hi-Lift All Purpose Mechanical Jack — 7000-Lb. Capacity
    Item# 1442 $60
  Home Fire Extinguisher ABC
    Item# 8889 $20
  S-Line Tow Strap — 18,000-Lb. Capacity, 2in. x 30ft, Nylon
    Item# 331732 $40
  Blitz Self Venting Gas Can — 5 Gallon Capacity
    Item# 33421 $10
  Northern Industrial Cable Puller — 4-Ton
    Item# 11239 $40
  HI-LIFT Lift-Mate for use with HI-LIFT Jacks — Model# LM-100
    Item# 144215 $30
  Hi-Lift 4XRAC Mounting System
    Item# 144217 $25
  Northern Industrial Tools Tree-Saver Winch Strap
    Item# 1938 $7
  Clevis — 1in. Dia, Heat Treated Pin
    Item# 318029  $13.00
  Interdynamics Model# HD-275 12V Compressor — Inflates to 300 PSI
    Item# 160304 $40

My 89 Trooper RS options plate and specifications:

UT Trooper
Manufactured November 1988
Frame Model = UBS7VC BB/II
Grade RBD = GRADE LS 84-91 (logo says RS)
Body V4N = 2 DOOR WAGON
Chasis type = Utility 4x4

EXTERIOR SPECS

• Color/Trim 226/107 = Black with grey trim & red pin stripe
• Exterior dimensions LxWxH = 162.3 x 65 x 72.6 in
• Interior dimensions LxWxH = 67 x 53 x 49 in
• Seating capacity = 4 persons
• Doors number = 3
• Cargo area = 54.4 cu ft with seat up (62.1 cu ft with out seat)
• Fuel tank capacity = 21.9 gallons
• Curb weight = 3775 lbs
• Gross payload = 1165 lbs
• Wheelbase = 90.6 in
• Treads = 54.7/55.1 in front/rear
• Minimum ground clearance = 9.4 in
• Min.turning radius = 17 feet
• Max approach angle = 43 deg
• Max departure angle = 32 deg
• Max ramp angle = 529?
• Max break-over angle = 24 deg?
• Max tilt (roll-over) angle = 45 deg (30 is scarey enough!)
• Max wading depth = 12.7 inches?

ENGINE

• Displacement = 2559cc/2.559L
• Max.power (Net) = 120 ps / 5000 rpm
• Max.torque(Net) = 146 ft-lbs @ 2600 rpm
• Power density   = 13.58
• Engine type = Water cooling serial 4 cylinder SOHC
• Fuel system = Electrically controlled gasoline injection system
• Fuel type = Unleaded regular gasoline
• Compression ratio = 8.3
• Bore = 93.6mm
• Stroke = 95mm
• Fuel consumption = 8.6 4x4 trail / 16 city / 22 highway MPG

TRANSMISSION & CHASSIS

• Transmission M75 = MANUAL TRANSMISSION MSG 5 SPEED
• Drive = PART 4WD
• Differential gears ratio = 4.77:1 (89 RS standard, Troopers usually 4.55:1; 5:38 after market available)
• Transfer case low ratio= 2.28:1 (3.07:1 Tera Low kit avaialbe)
• Transmission gear ratios = Reverse: 3.873, First: 3.767, Second: 2.314, Third: 1.404, Fourth: 1.000, Fifth: 0.809
• Crawl ratios
  • 39:1 with 2.28 t-case & 4.55 diff gears (most stock 1st gens)
  • 41:1 with 2.28 t-case & 4.77 diff gears (stock RS class)
  • 55:1 with 3.07 t-case & 4.77 diff gears
  • 62:1 with 3.07 t-case & 5.38 diff gears!
• N40 = POWER STEERING
• 9JV = TIRES FRONT AND REAR 31X10.5R15 7JJX15-US BRAND (with 15x7 honeycomb pattern aluminum wheels)
• Braking system, front = Ventilated disk
• Braking system, rear = Disk
• F49 = SUSPENSION SOFT RIDE
• Suspension system, front = double wishbone torsion bar spring type independent
• Suspension system, rear = semi-elliptic leaf spring type axle
• K30 = AUTO CRUISE CONTROL
• C41 = HEATER & DEFROSTER
• B85 = BODY SIDE MOLDING
• NK4 = SPORTY LEATHER TYPE STEERING WHEEL 98
• SIY = AUTO LOCKING HUB* (replaced with Super Which Manual lockout hubs)
• VR1 = TRAILER HITCH 1 7/8"
• V43 = PAINTED REAR STEP BUMPER US
• U05 = DUAL TONE HORN*
• C25 = REAR WINDOW WIPER WASHER AND DEFOGGER*
• TR4 = HALOGEN HEADLAMP RECTANGULAR TYPE*
• U16 = TACHOMETER*
• V70 = FRONT AND REAR TOW HOOK*
• 6WH = FRONT WIPER WITH VARIABLE INTERMITTENT*
• 6NZ = WIDE TIRE*
• 7FC = WIDE TREAD SUSPENSION*
• Privacy glass
• Falling down type rear seat
• AM/FM radio equipped cassette player (FACTORY POWER GO SPACE ROCKET)
• Front fog lamps (third party)
• Jet Rack roof rack system (third party)

*OBSERVED NON OPTION PLATE ONLY LISTED ON FACTORY BUILD-SHEET

From wikipedia.org and www.isuzu.com