i was wondering if there is any way to hook up the factory sub in my 95' to an aftermarket head unit?

 

If you haven't re-wired anything, many guys reported that connecting Bose amp turn-on lead (pink in a old HU harness ??? not sure) to a turn-on wire from new HU output will re-enable Bose sub.

 

the sub gets its signal from the rear speakers then,i would assume?

 

Whenever a camaro (or bose anything for that matter) comes into my bay I use the Peripheral ISVE61. Basically, it's a premium sound output converter. It'll drop the voltages so that your factory amp can pick up signal. Never had a problem with it.. except for a mustang.. then again, that's ford

that interface runs about 50 bucks