i dont know what tranny you have in the 95 but zzp has this.
http://www.zzperformance.com/grand_prix/products1.php?id=547&catid=105
larger capacity will not help you out much.(i think it is already like 16qts) but a trans cooler will add life and takes a few more qts to make it full.
also i believe our pans are aluminum already.
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1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily