1988 suburban4x4 rearend leaked so went bad,rear end replaced,now wont shift into drive

i got the darn thing to go into drive once by engaging 4 wheel drive then out then park to first and back,vise versa ,next few stops she
wouldnt shift again?only first or second then i punch gas till it revs enough to catch second and away she goes until fast enough that revs high enough for everyone to think im nuttz,please help,air pocket?from truck slant rear replace? linkage adj? stumped
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