If the 3.8 is anything like the LT1 the balancer bolts onto a hub. It is the hub that comes off in a different manner.
There is some info to be gained in the 82 - 02 Firebird and TA Tech area.
You might have a bit more luck with this question on a site for late models and V6's. This Forum is primarily aimed at traditional Pontiac motors and older vehicles.
Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters  , Hydro-Boost 4-wheel discs, 4 Speed, 3.23 posi.
“Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill
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