USA Standard Axle Shaft For 8.2in Buick / Oldsmobile & Pontiac / Bolt-In Axle

A rear wheel that wobbles or leaks gear oil onto the brake shoes, a broken shaft after a hard launch, or worn splines that clunk every time you get on the throttle all send owners of 1964-1972 GTOs, LeMans, Tempests, Firebirds and full-size Pontiacs looking for a replacement axle. This is the USA Standard Gear ZA G8.2BOP-L, a 28-spline, 29-7/8 inch bolt-in rear axle shaft for the Buick-Oldsmobile-Pontiac version of the GM 8.2 inch ten-bolt.

What the axle shaft does in a BOP 8.2

Each shaft carries torque from a side gear in the differential out to the wheel. In the BOP 8.2 the shaft is held in by a retainer plate at the outer end, bolted to the axle tube flange behind the brake backing plate, instead of by a C-clip inside the carrier the way the Chevrolet 8.2 is built. The wheel bearing is pressed onto the shaft and the retainer clamps it in the housing, so the shaft, bearing and retainer work as one assembly. That design is why a Chevrolet axle will not drop into a BOP housing even though both are called 8.2 inch ten-bolts. USA Standard notes this shaft fits the RW507CR and Set 9 axle bearings.

Symptoms that call for a new shaft

• A rear wheel that wobbles or a tire that wears unevenly, from a bent shaft or flange
• Clunk or slack on throttle tip-in from twisted or worn splines at the side gear
• A rear wheel that stops turning or a car that will not move in gear after a broken shaft
• Gear oil on the inside of the wheel and brake shoes, often from a failed bearing that has also scored the shaft
• Rumble that rises with road speed from a worn axle bearing

How to confirm it is a BOP 8.2 and the right length

Pull a rear wheel and brake drum. If you see four nuts behind the axle flange holding a retainer plate, reached through a hole in the flange, the axle is a bolt-in design. A Chevrolet 8.2 or 8.5 with C-clips inside the carrier needs a different shaft. Then pull your old shaft, measure it from the wheel mounting face to the end of the splines and compare it to 29-7/8 inches, and count the splines (28). Pontiac moved the Firebird from the BOP 8.2 to the Chevrolet-corporate 8.5 around 1970-1971, and many of these cars have had rears swapped, so measure rather than going by the year. If the gears whine as well, the BOP 8.2 master overhaul kit covers the bearings and seal in the center section.

Fitment

USA Standard Gear lists this shaft for the GM 8.2 inch Buick, Oldsmobile and Pontiac rear in 1964-1972 Pontiac Bonneville, Catalina, Grand Prix and GTO, 1965-1971 LeMans, 1964-1970 Tempest and 1967-1972 Firebird. The same BOP 8.2 also went under Buick and Oldsmobile intermediates of that era. Axle length, bearing and bolt pattern changed between body styles, so match the 29-7/8 inch length and 28 splines to your old shaft, or send us the year, model and VIN to check before ordering. Other BOP rear parts are in hard parts.

Install notes

• Remove the drum, then the four retainer nuts through the flange access hole, and pull the shaft with a slide hammer
• The new shaft needs a wheel bearing and retainer pressed on with a press, not a hammer. Use a new bearing (RW507CR or Set 9 type) and inspect the retainer ring
• Replace the axle seal in the tube while the shaft is out so it does not leak onto the new brake shoes
• Check the side gear splines; if they are chewed, rebuild the case with BOP 8.2 positraction internals or an open spider gear set
• For more power or drag launches, the Yukon 1541H alloy BOP 8.2 axle is the same length in a stronger alloy
• Refill with 75W-90 gear oil, plus limited slip additive if the car has a Safe-T-Track or posi

Will this fit a Chevrolet 8.2 ten-bolt?

No. The Chevrolet 8.2 uses C-clip axles held inside the carrier. This shaft is for the Buick, Oldsmobile and Pontiac 8.2, which holds the axle with a bolt-in retainer plate at the outer end.

How long is the shaft and how many splines?

29-7/8 inches long with 28 splines. Measure your old shaft from the wheel mounting face to the end of the splines and compare before ordering.

Which bearing do I need?

USA Standard lists this shaft for RW507CR and Set 9 axle bearings. The bearing and retainer are pressed onto the shaft, so plan on a press or a shop with one.

Which cars used the BOP 8.2?

USA Standard's fitment lists the 1964-1972 GTO, Bonneville, Catalina and Grand Prix, 1965-1971 LeMans, 1964-1970 Tempest and 1967-1972 Firebird. Rears were often swapped, so confirm the axle style on your car.

Should I replace both sides?

Replace any shaft that is bent, broken or has worn splines. If one side broke from hard launches, check the other side closely, or step up both sides to the 1541H alloy version.