| USA STANDARD GEAR ZGK2121 Specifications |
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| Axle Bearings Included | No | | Axle Seals Included | No | | Brush, Marking Compound, and Loctite Included | Yes | | Carrier Bearings and Races Included | Yes | | Carrier Shims Included | Yes | | Cover Gasket or Silicone Included | Yes | | Crush Sleeve or Preload Shims Included | Yes | | Head Bearing Included | Yes | | Instruction Manual Included | Yes | | Pinion Nut Included | Yes | | Pinion Seal Included | Yes | | Pinion Shims Included | Yes | | Positraction Included | No | | Ring & Pinion Included | Yes | | Ring Gear Bolts Included | Yes | | Tail Bearing Included | Yes |
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USA Standard Gear's Differential Ring & Pinion Kits draw from years of technical data 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, differential rebuild kit with high quality Koyo bearings and 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 three convenient differential repair parts to save time and money by including everything you need in one simple part number.
- Manufactured using proven technologies to ensure top quality ring & pinion gears, which are machined from 8620 steel for precise application.
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 |
 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)
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