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From my 07 order guide. Snow plow prep is only a spring upgrade. I think this bumped the front GVWR from 4100 to 4300. All the other items are complements of the HD payload package.
SNOW PLOW PREP PACKAGE (62S) (LATE AVAILABILITY)
Usage: Increases GVWR for improved payload & towing
Availability:
• Requires Heavy Duty Payload Package (627)
• 4x4 only; NA on 4x2
• NA w/SuperCrew or Harley-Davidson™ Package (86H)
• Maximum snow plow weight, including permanent attachments, is 700# (See
Bodybuilders Layout Book for more details)
Includes:
• Spring upgrades
NOTE: Restrictions apply; see your dealer for more information.
HEAVY DUTY PAYLOAD PACKAGE (627) (Late Availability)
Usage: Increases GVWR to 8200 lbs. for improved payload & towing
Availability:
• Regular Cab Styleside 8.0' box (145" WB) or SuperCab 8.0' box (163" WB)
• XL & XLT
• Requires 5.4L V8 Engine
• NA w/the 5.4L V8 FFV Engine or FX2 Sport Package (86S)
• Deletes standard Tire Pressure Monitoring System
• 35.7 gallon fuel tank (655) req. w/Regular & SuperCab 4x4; optional w/4x2
Includes:
• 50-State Emissions System
• LT245/70x17D BSW A/T tires (T7D)
• High capacity 17" 7-lug steel wheels (64K)
• Heavy Duty shock absorbers, frame & 72 amp battery
• Upgraded springs, radiator & auxiliary transmission oil cooler
• 10.25" gear set w/4.10 axle
• Standard 4.10 axle (Optional 4.10 Limited Slip – XB5)
Optional Equipment:
• Snow Plow Prep Package (62S)