8 3\4 swap?? Bearings?

So I have purchased a used and not quite assembled 489 c\section with clutch style suregrip. Pinion bearing not all the way on and ring gear turns not so freely! So I have installed new pinion bearings and have reassembled unit, it seems when I tighten side bearing caps they pinch outter races and side adj'ers are to tight to turn?????Soooooo I moved everything over to another known good 489 case open and have noticed that the side bearings are different not as wide! so I am assuming prev owner of first c\section put together with wrong side bearing would not turn beat pinion part out and gave up put it on the shelf for 20 yrs till I came along! Side bearings on unit timkin 25520 on other open unit lm104912 caps appear the same ,so is the width of my side bearing screwin me up or what?? C\section # of the one I will be using 2881489 posi unit#30487 ring and pinion 3:55 taper 489??