If a GN box bolts right into the older GM cars I would assume the PT#276550 would be the one to get. That is the box used when the vehicle is setup with performance suspension packages. I would assume that would be the box with a quicker ratio right? This is also the same box that is used on the third gen camaros, again with the performace suspension packages. Do these late model boxs use the same type of fluid line fittings as our older vehicles¿?
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1973 Firebird
In process of restoring
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