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New 8.8 Rear Diff came with Pinion Flange for large U Joints - I bought what was supposed to be a "1986-2004 Mustang Ford Performance M-4851-C Pinion Flange for 8.8" Axle" BUT it has the same small spline as my old 7.5 Pinion Flange so it will not slide on the 8.8 Diff - It MAY be labeled wrong...

Got the new wider 8 inch rear end with Drums installed thanx to the awesome info above - New Rear end just has flange... what where is correct U Joint seat for existing driveshaft ?

AXLE CODE 86 from Door Sticker - SPRING CODE E F - 15 inch wheels - I'm sure there's a Code breakdown somewhere here on this GREAT Board - 2.9 Cologne V6 - 5 Speed - I'm a LONGtime Ford & Lincoln guy, have 5 on the road & a couple "projects" - Body was straight & a relatively rust free NC...

Just bought this last week - "Clanked" so badly I just had it towed straight to shop after 100 yard test drive - I had shop gut the Front Auto Locks for future upgrade & help diagnosing the Hammering - Its definitely Rear End SLAMMING so hard WE THOUGHT it was Front End as the whole Truck...