My IS-F has always made a "thump" when selecting reverse gear. This is particularly true when the engine and transmission have just be started cold.
We've just bought a new home with a steep drive down into the garage. When I reverse out in the morning everything is smooth and uneventful unless I pause on the incline. When I select reverse again there 's a loud thump ... or thunk ... at the same time the doors lock.
Most interesting, I notice the event is louder the higher the rear of the car is above the front.
Could this be the differential? I did change out the factory oil for Mobil1 75W-90 LS at 10,000 miles.
Year: 2008
Miles: 21500
We've just bought a new home with a steep drive down into the garage. When I reverse out in the morning everything is smooth and uneventful unless I pause on the incline. When I select reverse again there 's a loud thump ... or thunk ... at the same time the doors lock.
Most interesting, I notice the event is louder the higher the rear of the car is above the front.
Could this be the differential? I did change out the factory oil for Mobil1 75W-90 LS at 10,000 miles.
Year: 2008
Miles: 21500