I have thrown my last $$ at my stock POS differential. I have replaced gears (2 sets of 4:10s) and bearings 3 times. I am considering a 9" and am looking for feedback from guys that are running these. I need to keep my 4:11 ratio for my setup. My questions are>>

How much HP is lost to turn these larger components?

Who makes quiet running gears for the 9"? This is a street car.

Any advantage/disadvantages to 9" vs 12 bolt?

Is there a way to keep ABS with a 9 inch setup?

(I have a 9" posi 3rd member in a truck I am parting out and using this will reduce my initial cost on an upgrade. Moser and a couple others out there make complete bolt in setups minus the 3rd member.)

Any, and all feedback, good and bad is appreciated!

Thanks in advance
Keith H.

96 Formula ws6m6, cam/headwork, etc.