1990 Pontiac Bonneville Q&A
1990 Pontiac Bonneville Question: Car rolls down hill when in park?
I think the park pawl is in the extension housing. It might be a little messy but it shouldn't be too hard with a manual specifying how to adjust the pawl. If it's in the extension housing, you'll need that gasket and you might consider a new tail shaft seal while you're there. - Andy Y