If your vehicle is showing loud banging noise from underneath the car while accelerating, here are the most likely causes and the parts you'll need to fix each one.
When the rubber in these mounts tears or collapses, the engine and transmission twist excessively under acceleration torque, causing heavy metal components to slam against the vehicle's frame.
Rubber exhaust hangers degrade and break over time. Under acceleration, the engine shifts and causes the loose exhaust pipe to swing and bang against the undercarriage or heat shields.
Common on RWD and 4WD vehicles. A failing universal joint or torn center support bearing allows the driveshaft to wobble violently and hit the transmission tunnel under heavy load.
If control arm bolts or subframe mounts were not properly torqued during recent suspension work, the components will shift and bang loudly against their mounts when acceleration torque is applied.
On FWD and AWD vehicles, severely worn inner CV joints can bind and release or clunk heavily when the front suspension lifts and torque is applied during hard acceleration.