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according to an old Chilton's Repair Manual I have (1969) the refrigerant capacity is 4 1/4 lbs.for the '63-'69 pontiac and the '63-'69 Tempest is 3 3/4 lbs. Since the GTO would be an 8 cylinder I would expect the higher capacity. The oil capacity is 6 qts. plus 1 for a new filter for both the 350 and 400 CID
You will need what is called an oil vacuum pump. They are not very expensive (around $20-$30 US) & are usually available at your local auto parts outlet. They are basically an oversized syringe with a flexible rubber or plastic tube instead of a solid steel probe & will usually hold about a metric litre. Hand operated. Use this to withdraw as much oil as you can from the Diff, it is impossible to get every drop. You will also find it handy to refill the diff, but flush it out first with kero or diesel. I also recommend draining all you can in one step, then waiting 1/2 an hour to 45mins and doing it again to get the last bit.
Removal Procedure Disconnect the oil pressure sensor electrical connector (1).
Important: Clean the area around the sensor before removal. This prevents debris from entering the engine. Use J41712 to remove the oil pressure sensor from the engine block.
Installation Procedure
If installing the old sensor, apply thread sealant GM P/N 12346004, (Canadian P/N 1093480), or equivalent. Notice: Refer to Fastener Notice in Service Precautions.
Use to install the J41712 oil pressure sensor to the engine block. Tighten the engine oil pressure sensor to 35 Nm (26 ft. lbs.) .Connect the oil pressure sensor electrical connector (1).
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