USA Standard Gear Standard Spider Gear Set For GM 9.5in / 33 Spline

Standard Open Spider Gear Set for GM 9.5-Inch 33-Spline Differential

The USA Standard YUKZIKGM9.5-S-33 is a complete standard open spider gear set for the GM 9.5-inch rear differential with 33-spline axle shafts. This kit covers the GM 9.5in differential found in late-model full-size Chevrolet and GMC trucks and SUVs, providing all side gears, spider gears, cross shaft, and thrust washers needed for a complete, correct service. YUKZIKGM9.5-S-33 components are manufactured from high-quality steel with precision machining for correct tooth geometry and smooth operation. When worn spider gears cause axle noise, binding, or uneven power delivery, this kit restores factory function to differentials that use YUKZIKGM9.5-S-33 components.

Key Features

• Complete spider gear set for the GM 9.5in 33-spline differential
• High-quality steel construction for extended service life
• Precision manufactured for correct tooth geometry and proper gear mesh
• Includes side gears, spider gears, cross shaft, and all thrust washers
• Direct replacement requiring no modification
• Lifetime limited warranty under the Magnuson-Moss Warranty Act

Specifications

Fitment

What's Included

• 2x side gears (33-spline)
• 4x spider (pinion) gears
• Spider gear cross shaft
• Thrust washers

Frequently Asked Questions

How do I confirm my GM 9.5in differential is 33-spline?
Pull an axle shaft and count the splines on the end that engages the side gear. The GM 9.5in differential comes in both 30 and 33-spline variants, and ordering the wrong kit will result in a non-fitting part. Count your splines before purchasing.

What symptoms indicate worn spider gears in the GM 9.5in differential?
Common symptoms include a clunking noise when accelerating from a stop, binding when cornering at low speed, unequal tire rotation in turns, and metal debris in the gear oil during a fluid change.

Is this kit for open differentials only or does it work in a limited-slip?
YUKZIKGM9.5-S-33 is designed for standard open differentials. The side gear and spider gear geometry in limited-slip carriers differs, requiring a specific limited-slip spider gear set.

Does this kit fit GM 9.5in differentials in HD trucks?
The fitment is specific to the 9.5in rear differential with 33-spline axle shafts. Verify your axle housing ring gear diameter, spline count, and differential type before ordering.

What is the warranty on this spider gear set?
USA Standard covers the YUKZIKGM9.5-S-33 with a Lifetime Limited Warranty. The Magnuson-Moss Warranty Act provides additional consumer protections as this is a drivetrain rebuild component.

Can I install this kit without removing the differential carrier?
No. Spider gear replacement requires removing the differential carrier from the axle housing, removing the ring gear and pinion lock pin, and disassembling the carrier to access the spider gears and cross shaft.

Should I replace the thrust washers even if mine look okay?
Yes. Thrust washers are wear items and are included in this kit. Installing new washers ensures proper side gear end play and prevents rapid wear on the new spider gears.

What gear oil should I use after reassembly?
The GM 9.5in differential uses 75W-90 GL-5 gear oil. If the carrier has a limited-slip unit, add the specified friction modifier additive.

Installation Notes

• Verify spline count on the axle shaft before ordering YUKZIKGM9.5-S-33, confirming 33-spline engagement
• Remove the differential carrier per the factory service manual procedure before disassembling the spider gear assembly
• Install new thrust washers from the kit, and confirm side gear end play is within spec before final assembly
• Replace the ring gear bolt lock wire or thread-lock per the factory specification during reassembly
• Refill with the correct GL-5 gear oil and check for leaks before returning to service

California Prop 65 Warning

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.