ok so i went to install my detroit tru trac today that i got from a member along with my 4.11s i got from rons machining on ebay with his install kit.....so i got the pinion in and ring gear bolted up and go to put the carrier in and realize the bearing are too small????? the bearings included in my kit fit my diff housing but not my tru trac.....do i have the wrong bearings or is the tru trac wrong....please help! my truck is tore down and got no clue!

thanks