USA Standard Axle For 8.2in & 8.5in GM Passenger Car. 30 1/8in Long / 28 Spline / 2.780in Hub
If a 1970s Camaro, Firebird, Chevelle or Monte Carlo has a rear end that howls on the freeway, a wheel that will not sit true, or a shaft that snapped with a bang leaving the car stranded, the axle is usually the part that needs replacing. The USA Standard Gear ZA G1255802-SH is a new 30-1/8 inch, 28-spline rear axle with a 2.780 inch hub for GM 8.2 inch and 8.5 inch passenger car ten-bolts, the longer of the two common shaft lengths used under GM A-body and F-body cars of that era.
Each shaft runs from a side gear in the carrier out to the wheel. At the inner end, 28 splines take the torque and a C-clip in a groove locks the shaft in place inside the differential. At the outer end, the shaft passes through a wheel bearing pressed into the axle tube, and that bearing rolls directly on a hardened band of the shaft. The flange carries the wheel studs, and the 2.780 inch hub centers the brake drum or rotor. Because the shaft is part of the bearing, a failed bearing is often also a failed axle.
A wheel bearing hum and a ring and pinion whine can sound alike, so isolate the sound first. Bearing noise usually changes when you swerve left and right, putting load on one side, while gear whine changes with throttle. Then remove the cover, pinion shaft lock bolt and cross shaft, push the axle inward, remove the C-clip and pull the shaft. Run a fingernail across the bearing surface. A groove, pitting or discoloration means the shaft should be replaced. If the gears are also worn, a GM 8.5 3.42 ring and pinion with master install kit or the GM 8.5 3.73 ring and pinion set lets you do the whole rear at once.
The listing specifies GM 8.2 and 8.5 inch passenger car rears with a 30-1/8 inch shaft, 28 splines and 2.780 inch hub. The dimensionally identical Yukon alloy version of this shaft is charted for:
That chart's notes list the length as 30-1/4 inches while the shaft itself is specified at 30-1/8 inches, and these rears have often been swapped between cars, so measure your old shaft from the flange mounting face to the end of the splines before ordering. If yours measures about 29-1/2 inches, you need the 29-1/2 inch GM 8.2/8.5 axle. Earlier Pontiac Firebirds with the bolt-in Buick-Olds-Pontiac 8.2 rear do not use this C-clip shaft. Send us your year, model, VIN and measurement if you want it checked, or see the rest of our rear end parts in hard parts.
If you are also changing the yoke, the forged GM 8.5 1350 yoke is a common upgrade on cars that have moved to a 1350 driveshaft.
| Brand | Yukon Gear & Axle |
| Part number | ZA G1255802-SH |
| Fits | USA Standard Axle For 8.2in & 8.5in GM Passenger Car. 30 1/8in Long / 28 Spline / 2.780in Hub |
| Type | Axles |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a GM 8.2 and 8.5 inch passenger car shaft. The same-size Yukon alloy shaft is charted for the 1970-1981 Camaro and Firebird, 1968-1973 Chevelle and 1970-1973 Monte Carlo. Measure your old shaft to confirm.
Only the length, which depends on the housing width of the car. Both have 28 splines and a 2.780 inch hub. Measure from the flange mounting face to the end of the splines to tell which you have.
Yes. It is held in by a C-clip at the inner end inside the differential, so you must remove the cover and pinion cross shaft to install it.
Yes. The bearing rolls directly on the shaft, so install a new bearing and axle seal in the tube with the new axle.
No. This axle has 28 splines and needs 28 spline side gears. If the rear has been converted to 30 spline, buy matching 30 spline axles.
