USA Standard Axle For 91-96 Caprice & 91-93 Impala

Bolt-In GM 8.5in Rear Axle Shaft for 1991 to 1996 Chevrolet Caprice and 1991 to 1993 Impala

The ZA G26018080 from USA Standard Gear is a direct-fit replacement rear axle shaft for the GM 8.5in semi-floating rear axle used in the 1991 through 1996 Chevrolet Caprice and the 1991 through 1993 Chevrolet Impala. Machined to 30 3/8 inches in length with a 30-spline count and a metric 5-lug wheel flange, the ZA G26018080 is engineered to restore factory-correct power delivery to the rear wheels of these full-size Chevrolet sedans. Construction from 1541H alloy steel ensures the shaft has the strength and dimensional consistency needed for reliable long-term service.

This shaft is compatible with both drum and disc brake configurations, making it suitable across the full range of Caprice and Impala variants that used this axle. USA Standard Gear backs the ZA G26018080 with a 10-year limited warranty against manufacturer defects.

What's Included

• 1 x USA Standard Gear ZA G26018080 Rear Axle Shaft

Specifications

Vehicle Fitment

About USA Standard Gear Axle Shafts

USA Standard Gear, a Yukon Gear and Axle brand, produces replacement axle shafts that meet or exceed OEM dimensional and material standards. The full-size B-body Chevrolet platform used in the Caprice and Impala of this era employed a robust GM 8.5in rear axle that responds well to quality replacement components. This shaft maintains the original shaft dimensions to ensure proper bearing preload, brake component clearance, and wheel flange alignment are all preserved after installation.

Frequently Asked Questions

What vehicles does the ZA G26018080 fit?
This shaft fits the 1991, 1992, 1993, 1994, 1995, and 1996 Chevrolet Caprice, and the 1991, 1992, and 1993 Chevrolet Impala, when equipped with the GM 8.5in semi-floating rear axle.

Will this shaft work on a Caprice with rear disc brakes?
Yes. This shaft is compatible with both drum and disc brake applications, covering the full range of Caprice and Impala variants that used this axle.

What spline count does this shaft use?
This shaft is machined to a 30-spline count, which is the correct specification for the GM 8.5in axle application in these full-size Chevrolet vehicles.

Is this a left side or right side shaft, or does it fit both sides?
Please verify which side you need before ordering by measuring the length of the shaft on your vehicle or comparing the worn shaft to the 30 3/8-inch specification. Always confirm against your original shaft before installation.

What bolt pattern does the wheel flange use?
This shaft uses a metric 5-lug wheel flange, consistent with the factory bolt pattern used on the Caprice and Impala for this generation.

What material is this shaft made from?
The shaft is produced from 1541H alloy steel, which provides elevated tensile strength and improved fatigue resistance compared to plain carbon steel.

What warranty comes with the ZA G26018080?
USA Standard Gear provides a 10-year limited warranty against manufacturer defects on this shaft. This warranty is offered in compliance with the Magnuson-Moss Warranty Act. Keep your purchase receipt to support any future warranty claims.

Does this shaft require any modification for installation?
No modification is required. This is a direct-fit replacement for the factory axle shaft on qualifying Caprice and Impala models. Standard axle shaft removal and installation tools are sufficient for the job.

How do I verify that my Caprice or Impala uses the GM 8.5in axle?
The GM 8.5in rear axle used in these B-body cars can be identified by its 10-bolt differential cover, casting numbers on the axle tubes, or the axle ratio tag attached to the driver-side axle tube. Cross-referencing the tag code with a GM axle identification guide will confirm the axle type and gear ratio.

Installation Instructions

1. Raise the vehicle and support it at the rear frame or axle housing using appropriately rated jack stands. Remove the wheel on the side being serviced.
2. Remove the brake drum (for drum brake applications) or the caliper and rotor (for disc brake applications). Secure the caliper so it does not hang by the brake hose.
3. Remove the differential cover and drain the gear oil into a suitable container.
4. Remove the pinion shaft retaining bolt and slide the pinion shaft out of the carrier.
5. Push the axle shaft inward to relieve tension, then remove the C-clip from the shaft groove inside the differential.
6. Carefully withdraw the old axle shaft from the housing. Inspect the axle bearing and seal; replace any worn components before installing the new shaft.
7. Slide the ZA G26018080 into the axle tube, aligning the splines with the carrier side gear. Push inward until the C-clip groove is accessible inside the differential housing.
8. Install the C-clip on the groove, then pull the shaft outward to seat the C-clip against the side gear.
9. Reinstall the pinion shaft and tighten the retaining bolt to the manufacturer's specified torque.
10. Clean the differential cover mating surface, then reinstall the cover using a new gasket or RTV sealant. Torque the cover bolts evenly.
11. Fill the differential with the correct type and quantity of gear lubricant as specified by the vehicle manufacturer.
12. Reinstall the brake components and wheel. Torque lug nuts to specification.
13. Lower the vehicle and perform a test drive. After the drive, inspect for gear oil leaks at the cover and check for any abnormal noise from the rear axle.