These are the tech servie bulletins for your dads car doesnt sound like your symptoms.
you might just had bad luck as i lov
I am the only one that can open the bulletins But For educational purposes I can show it to you. I will paste it below. I thought your question was= Are my cars symptoms a common problem. But here is the tech page your requested.
File in Section: 6 - Engine
Bulletin No.: 53-60-03
Date: February, 1995
SUBJECT:Vibration, Knocking - Tapping Noise when Vehicle is put into Reverse (Grind Torque Strut to Engine Mount Bolt)
MODELS:1994-95 Buick Skylark1994-95 Oldsmobile Achieva1994-95 Pontiac Grand Amwith 2.3L Engine (VINs A, D, 3 - RPOs LG0, LD2, L40) and 3.1L Engine (VIN M - RPO L82) and 3T40 and 4T60-E Transaxles (RPOs MD9, M13)
Some owners may comment on a drivetrain vibration and knocking-tapping noise when the vehicle is put into reverse. The noise will originate from the right front of the vehicle.
The torque strut to engine mount bolt contacts the front suspension support on the vehicle and emits the vibration - knocking/tapping sound.
Inspect the tapered end of the torque strut to engine mount bolt for marks indicating contact with the front suspension support.
Grind torque strut to engine mount bolt off flush with the nut welded to the front suspension support of the vehicle as follows: