USA STANDARD GEAR
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USA STANDARD GEAR ZGK2129 Specifications
Axle Bearings IncludedNo
Axle Seals IncludedNo
Brush, Marking Compound, and Loctite IncludedYes
Carrier Bearings and Races IncludedYes
Carrier Shims IncludedYes
Cover Gasket or Silicone IncludedYes
Crush Sleeve or Preload Shims IncludedYes
Head Bearing IncludedYes
Instruction Manual IncludedYes
Pinion Nut IncludedYes
Pinion Seal IncludedYes
Pinion Shims IncludedYes
Positraction IncludedYes
Ring & Pinion IncludedYes
Ring Gear Bolts IncludedYes
Tail Bearing IncludedYes
Includes Ring & Pinion
USA Standard Gear's Differential Ring & Pinion Kits including positraction units are the most complete solution on the market and were made specifically with mechanics, installers and you in mind. Save time, money, and stress, and get your vehicle off the lift and on the road quicker than ever.

Features & Benefits:
  • Includes USA Standard Gear ring and pinion, Yukon Dura Grip clutch style limited slip (LSD) positraction unit, differential rebuild Kit with high quality Koyo bearings and all of the necessary small parts to ensure smooth, lasting functionality for the toughest drivers out there.
  • Allows you to easily find the correct parts for common differential repairs at an affordable price.
  • Provides four convenient differential repair parts to save time and money by including everything you need in one part number.
  • Manufactured using proven technologies to ensure top quality ring & pinion gears, which are machined from 8620 steel for precise application.
  • Included positraction units are fully rebuildable. If only one tire spins on a slippery surface, it's time to replace your positraction unit or upgrade to one from your standard open differential.
Differential Identification Guide

To order the correct ring & pinion, it's crucial to know the differential type and gear ratio on your vehicle.
  • First, determine your Differential Type.
  • Next, determine the gear ratio on your vehicle using one of the following methods:
    • Count The Teeth: Divide the number of teeth on the ring gear (big gear) by the number of teeth on the pinion gear (small gear). If you have 37 teeth on your ring gear and 12 teeth on your pinion gear, you have a 3.08 Gear Ratio (37 ÷ 12 = 3.08).
    • Verify Through A Dealer: Verify the ratio using your VIN number. This will only be accurate if the differential has not been previously modified.
Which Differential Rebuild Kit Is Right For You?

Kit Type Typical Contents
(Actual Contents Vary By Brand / Application)
Standard • Pinion Bearings & Races
• Carrier Bearings & Races
• Pinion Nut & Seal (where applicable)
• Crush Sleeve or Preload Shims (where applicable)
• Various Sealants / Marking Compounds
Master Standard Kit, Plus:
• Ring Gear Bolts
• Carrier & Pinion Shims (where applicable)
Mega Master Kit, Plus:
• Axle Bearings & Seals
Super Mega Kit, Plus:
• Differential Ring and Pinion

Videos

What's In The Box?

Additional Resources

Torque Specifications & Installation Instructions
USA Standard Gear Technical Support

If you are having trouble choosing the correct USA Standard Gear part, or experiencing issues during or after installation of this part, USA Standard Gear's technicians are available to help answer your questions.

Phone: 1-866-748-0902 (M-F 6am-4pm PST)



USA STANDARD GEAR Warranty Information:
12 Months
Warranty Details