Its probably been posted somewhere but i cant find it. How much HP and TQ can you put thru those rear ends if i am running with slicks. obviosly if its steet tires it don't matter i'll spin tires before i break anything. but what about if i am running on slicks how much power can they handle.

I had mine into the high 11's before yanking it out to put a 10 bolt in so I could get a better gear ratio. When I hit low 11's, the 10 bolt came out for a 9".

so the borg warner axels can handle a good amount? im only going about 300 hp 400tq if i put slicks on i shouldnt break the rear end as stock correct?

People have broken or bent them on the street also. It all depends on how you drive. There's no guarantee that yours will survive but they can survive a lot of abuse.

The axles are not the weakest part of the diff. A 10 bolt has a 7.5/7.625" ring gear. The BW 9 bolt has a 7.75" ring gear. That's not much of an increase however it also has 4 side gears so the load is spread over more teeth to make it a little bit stronger. If you break anything, it will be the teeth off the ring and pinion before you break an axle.