Had a 92 Cadillac Sedan Deville in White with Red leather, lace wheels and I think those were the only options great car. Had boat loads of torque. That Deville has a 300ci. V8 which was the last V8 made before ever Cadillac car got the Northstar V8, your car has a 4T60 automatic. No parts you share with Bonneville'* as far as the engine is concered some transmission stuff, no engine stuff. The Caddy is a C-Body the Bonneville is a G/H-Body G is the eailer generation. They do have something in common but not the motor lol. I remember pushing mine to well over 90mph (I don't know cause the speedo only hit 85) then I traded in for my SLE. Good luck with her!
I was sad that day because it was dads car only had a few problems but it was impractical for me and 91 gas isn't cheap, plus I do not have Caddy money nor am I old yet lol. My son and I will forever miss that car but forever love the Bonneville!
Funny how that goes isn't it?