ok i have a hydro b series trans diff on the back side of this its stamped p81 what is this diff out of? an ls b16 or gsr? let me know i also have another diff stamped p80 that is also a b series hyro diff any help would be great. thanks

 

im not sure what the p81 diff. is but the p80 diff. is a GSR

 

yes the p80 is a gsr i just wanted confirmation on that it came out of my gsr trans allits spider gears were bad and needed a ring gear and the ring gear wa 300$ so i got a b16 diff and ring gear with 30k on it for 200$ so n ow i have a gsr with a b16 5th gear funny combo hunh the thing is i didnt look at the stamp on the b16 b4 i put it in so still tryin to find out what the p81 diff is for

 

well good luck bro,cuz i searched for like an hour and didnt find anything