Ok, got your info, looked it up in my manual. According to the broadcast codes you gave me
BTW, the first digit in the broadcast code designates the year of the tranny. 6ASW=1996. If the Olds trans did come out of 1997, the code would read 7ASW. So, either the transmission you got was swapped out, or your seller was mistaken for the year it came out of.
Considering these trans are pretty much the same. Here'* what you need to do.
Swap differentials, gear sprockets and chain. This will put you back to the original 3.06 drive with no problems. Let me know if you need any help with this.
1997 Pontiac Bonneville SEi-SCRAPYARD
2000 Chevrolet Blazer LT 4X4 4.3L
2002 Chevrolet *-10 LS Ext Cab 4X4 5.7 V8