FORD  OEM FACTORY  31 SPLINE POSI  ,,,WILL BE ABS ,,, all gears ratio,s fit.    20 + YEARS SA A DIFFERENTIAL INSTALLER SHOP OWNER .......DONT BUT USED JUNK     THIS POSI HAS BEEN RECONDITIONED ..SET UP TO FORD STANDARDS.. .TORN DOWN ALL HEAVILY WORN PARTS WERE REPLACED ,,,,, NOT JUST A TAKE OUT ,,,,,,,RECONDITIONED POSI WILL BE AT LEST 95%CLUTCH REMAINING .... ...HERE IS SOME INFO TO HELP IDENTIFY A 8.8.... R/G DIAMETER 8.8.... R/G BOLTS 10 .....COVER BOLTS 10 ..... YOKE SPLINE 28 ..... CLEANED , INSPECTED , NO RUST , CHIPS , PITS OR HEAVY WEAR ..... FLAWLESS WORKING CONDITION ...BEARING CONDITION GOOD USED   ... BE SURE OF YOUR APPLICATION .....FIT ALL8.8 (NOT 7.5    not car  explorer and f150 only )  ALL MY PARTS ARE GUARANTEED I WILL NOT BE RESPONSIBLE FOR YOU NOT KNOWING YOUR APPLICATION  .......................................................................................................................................................................................................................................................................POSI WAS DISASSEMBLED CLEANED RECONDITIONED AND REASSEMBLED ....IF YOU NEED A GEAR RATIOS PLEASE EMAIL ME   ........................................................................................................................................................................................................................................................... EVERY THING THAT CAN BE DONE HAS BEEN DONE TO INSURE THIS POSI  WILL BE IN THE BEST USED CONDITION U WILL FIND.....(LOOK TO MY OTHER AUCTION FOR 308 345 373 410 GEARS , AND OTHER SPLINE POSI ,S ....................................................................................................................................................................................... ,,,...........................................................................................................................................................................................................................................................I HAVE HUNDREDS OF GEARS AND POSI IN STOCK AND SOLD THOUSANDS OF THEM ON EBAY !!!!!  !!!................................................................................................................................................................ ,,,,,...........................................................................................................................................................................................................................................................IF THERE IS A PROBLEM WITH ANY ITEM IT WILL BE TAKEN CARE OF SEE MY FEEDBACK IF YOU HAVE ANY QUESTIONS, EMAIL ME AND I WILL DO MY BEST TO GET WHAT YOU NEED OR CALL 503 353 0220................................................................................................................................................................................... ......................................................................................................