Ive got a 3.8 AOD in my 87 bird. getting a SO 5.0 with an AOD trans out of a 87 cougar. whitch has a better stall rateing. The 3.8 or the 5.0 converter? Also have a driveshaft out of a 88 turbo coupe with a T-5. would this driveshaft be better to use in my swap? looks like it has a very large vibration damper next to the tranny yoke.