Yukon Gear Positraction internals For 8.2in Buick / Olds & Pontiac w/ 28 Spline Axles
This is a repair part, not a complete differential. The Yukon YPKGM8.2-BOP-P-28 is the spider gear set for a Yukon Dura Grip positraction already installed in a Buick, Oldsmobile or Pontiac 8.2 in. ten-bolt rear with 28-spline axles. If your GTO, LeMans, Cutlass, 442, Skylark, Firebird or full-size Pontiac has a Dura Grip that has started to clunk on throttle, or you found a chipped pinion gear when the cover came off, this kit lets you rebuild the gear side of that unit instead of buying a whole new carrier.
A Dura Grip is a clutch-type limited slip. The clutch packs sit behind the two side gears and supply the bias, but the gears themselves do the work of differentiating: four pinion gears ride on a cross pin, mesh with two side gears, and the side gears drive the axle splines. Every corner, every launch and every wheel hop passes through those teeth. On a muscle car making far more torque than the factory planned, the pinion gears and cross pin are often the first parts to show wear, and a worn cross pin lets the gears float, which you hear as a knock when you get on and off the gas. Yukon's kit includes two side gears, four pinion gears, the cross pin shaft, its roll pin and the spider gear thrust washers. It does not include clutches.
If the complaint is chatter in tight turns or the posi no longer pulls both tires, that is usually the clutch packs or worn-out gear oil, not the spider gears.
Pull the cover and identify what is in the axle. This kit fits the Yukon Dura Grip only; Yukon states that plainly, so it is not for an original GM Safe-T-Track, an open case or another brand of posi. The case it fits is the Yukon Dura Grip for the BOP 8.2 with 28-spline axles. Also confirm you have the BOP 8.2 and not the Chevrolet 8.2 or the later corporate 8.5: the BOP rear uses bolt-in axles held at the outer bearing, and its parts do not interchange with the Chevy version. Our 10-bolt vs 12-bolt guide covers rear identification by cover shape.
Yukon lists this set for the GM 8.2 in. rear used by Buick, Oldsmobile and Pontiac: 1964-1972 Skylark, 1965-1972 Electra, 1964-1971 Olds 442, 1964-1972 Cutlass, 1964-1972 Bonneville, Catalina, Grand Prix and GTO, 1965-1972 LeMans, 1967-1972 Firebird and 1964-1970 Tempest. Rear axles were swapped often on these cars, so year alone does not settle it. Match the axle to the 28-spline Dura Grip in your car, or send us the year, VIN and what you found under the cover and we will check before it ships. More axle parts are in our hard parts collection.
| Brand | Yukon Gear & Axle |
| Part number | YPKGM8.2-BOP-P-28 |
| Fits | Yukon Gear Positraction internals For 8.2in Buick / Olds & Pontiac w/ 28 Spline Axles |
| Type | Ring & Pinions |
| 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.
No. Yukon builds this spider gear set for its own Dura Grip positraction for the BOP 8.2 with 28-spline axles. Factory GM units and other brands use different gears.
No. It includes two side gears, four pinion gears, the cross pin shaft, the roll pin and the spider gear thrust washers. Clutch discs are separate.
No. The Chevrolet 8.2 is a different axle. This kit is for the Buick, Oldsmobile and Pontiac 8.2 used in cars like the GTO, Cutlass, 442, Skylark and 1967-1972 Firebird.
A quality 75W-90 gear oil with limited slip friction modifier added, because the Dura Grip uses composite clutches that can chatter without it.
If the ring gear and carrier shims go back exactly as they came out, backlash should return to where it was. Check it with a dial indicator and a pattern before closing the cover.
