Yukon Gear Positraction Cross Pin Bolt For For 8.2in GM and Cast Iron Corvette

If you pulled the cover on a 1960s Chevelle, Impala, Camaro or Nova rear and found the cross pin lock bolt sheared, stripped or missing, this is the replacement. Yukon part YSPBLT-066 is the cross pin bolt for the factory Positraction carrier in the Chevrolet 8.2 inch 10-bolt and in the 1963-1979 cast iron Corvette rear. It is a small part, but it is the only thing holding the cross pin in the case, and a loose one can take the whole differential with it.

What the cross pin bolt does in a GM 8.2

The cross pin, also called the pinion shaft, runs through the carrier and the two pinion gears. The lock bolt threads into the case and passes through a hole in the end of the pin so it cannot slide sideways. On the Chevy 8.2 that job matters twice, because the axles are held in by C-clips on the inner end of each shaft inside the carrier. The cross pin is what keeps the axles from sliding inward and letting those clips fall out. If the bolt backs out or snaps, the pin walks toward the ring gear, and the C-clips lose their stop.

Symptoms of a failed cross pin bolt

• A sudden hard knock or banging from the rear that gets worse in turns
• Fresh metal or a chewed edge on the cross pin when the cover comes off
• An axle that moves in and out of the housing, or a rear wheel that starts to walk out
• A cracked carrier case or broken ring gear teeth where the loose pin hit
• Gear oil that suddenly looks like silver paint

Catch it early and you are buying a bolt. Catch it late and you are shopping for a carrier, gears and axles, which is why the bolt is worth replacing any time it has been removed more than a couple of times or shows thread damage.

How to confirm you need this exact bolt

Drain the oil, pull the cover and look at the bolt head and the pin. Wiggle the pin with a screwdriver; it should not move side to side with the bolt tight. Then make sure you really have a Chevy 8.2. Chevy Hardcore's identification guide notes the 8.2 has a smooth, round lower case with no cast-in bosses, an irregular 10 5/8 inch cover, 9/16 inch socket-head ring gear bolts with left-hand threads, and a 25-spline pinion. Our GM 10-bolt vs 12-bolt guide helps if the axle could be something else.

Fitment

Yukon lists this bolt for factory Positraction carriers only, in these applications: 1964-1972 Bel Air, Biscayne, Impala and El Camino, 1966-1971 Caprice, 1967-1970 Camaro, 1964-1972 Chevelle, 1964-1968 Chevy II, 1969-1972 Nova, 1970-1972 Monte Carlo, and the 1963-1979 Corvette with the cast iron differential. It is not listed for the Buick, Oldsmobile and Pontiac 8.2, which Chevy Hardcore points out is internally different and uses bolt-in axles instead of C-clips. Axles were swapped a lot in this era, so go by the housing, not the car. If you are not sure, send us the year and any axle codes. More 8.2 parts are in hard parts.

Install notes

• Clean the threads in the case with brake cleaner and chase them if they are rough. A bolt going into dirty or damaged threads will not hold.
• Line the hole in the cross pin up with the bolt bore before you thread it in; never force it.
• Use a medium-strength thread locker and torque to the factory service manual figure for your car.
• If the old pin is grooved or the pinion gears are worn, replace them now. A full 1964-72 GM 8.2 master overhaul kit or the Motive Gear 8.2 master kit makes sense if the bearings are tired too.
• Posi clutches that chatter can be refreshed with the Yukon 14-plate composite clutch set. Add the friction modifier the gear oil maker calls for; see our friction modifier guide.
• Seal the cover with a new gasket or a fresh Yukon chrome 8.2/8.5 cover and refill with 75W-90 gear oil.

Will this bolt fit an open (non-Posi) Chevy 8.2?

Yukon lists YSPBLT-066 for factory Positraction applications only. Open carriers may use a different bolt, so compare your old bolt to this one or send us your year and axle details before ordering.

Does it fit a Buick, Olds or Pontiac 8.2?

No. The BOP 8.2 is a different axle internally, with bolt-in axle shafts instead of C-clips, and it is not on Yukon's fitment list for this part.

Which Corvettes does it fit?

Yukon lists the 1963-1979 Corvette with the cast iron differential.

Can I reuse the old cross pin?

Only if it is smooth and the bolt hole is undamaged. A pin with grooves or a worn bolt hole should be replaced along with the bolt.

What gear oil goes in after the repair?

Use 75W-90 gear oil, plus the friction modifier your Positraction unit and oil brand call for so the clutches do not chatter.