i have a 95 trans am 6 speed and am thinking about getting an aftermarket rear end but i need to know what channel abs i have

 

If your car has traction control ("ASR" in GM-speak), it has a 4-channel system; if not, then it's a 3-channel setup.

If your rear end has "toothed wheels" and sensors at both ends of the axle, it's a 4-channel. If there's only one speed sensor, in the pumpkin, it's a 3-channel.