Some end play is normal (and required) but sounds like you may have too much, I'd have a look at the bearing race in the bowl and the screws that hold the bowl together. The bearing races can loose individual balls and the bowl bolts being untorqued can create some up-down and in out end play. The shop manual is pretty descriptive but needs to be read a few times before attempting a disassembly since there is a lot of steps.
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My Break Away Squad
1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s)
1969 Custom S 2dr ht
1969 LeMans (2dr & 4dr ht & Cvt)
1969 LeMans Safari wagon
1969 GTO (2 Cvt, 2 ht & Judge ht)
1969 Cat (3 Cvt’s & a 2dr ht)
1969 Ventura wagon 2 seat
1969 Exec 4dr post
1969 2 Bonnie Cvt's & 2 wagons
1969 Bonnie Brougham (4dr ht & Cvt)
1969 Grand Prix 2 SJ’s
1969 2+2 2dr ht (Canadian)
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