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snap-on makes a great tool called a vac300 if you have a air compressor, it sucks the fluid right out, you stick the hose in and attach the air line, it cost about $140 well worth it! i use it for everything!
 

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Plan #3 is drill a 1/4 hole in the bottom of the case, then tap it for a 1/4 NPT plug.

As fish noted- siphoning the old oil out is good enough. Be sure and add 2 bottles of the GM Posi additive.
 

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Hi all how do you chnage the rear fluid do you take the spring out to get the cover off or do you siphon it?
i'm stumped:doh:

You can buy a suction gun at any auto parts store for about $10. Attach a proper hose to it and suck your fluid out. I just changed the rear end oil in my '68 and '71 and it only took a few minutes. To make it easier drive the car at freeway speeds for about 30 minutes before to thin the oil. Then use the same suction gun to squirt the new fluid in.
 
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