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Thumping noise accelerating from stop infirst gear underneath near driveshaft

Dear and beloved car talk fellows, my name is Nick and we have a 1998 Subaru Forester with a 5 speed manual transmission.

When the car is stopped upon accelerating in first gear their is a thumping noise with diminishes after the car reaches second gear. There is a thudding vibration felt directly to the right of the driver underneath the car. The thumping would be where the drive shaft would be connecting to the rear of the vehicle. I cannot see any universal joints as the drive shaft is covered my the exhaust system.

Could it be a U Joint? The CV axles are all intact and the boots are undamaged as well.

Check for a broken motor-mount which will allow the engine to flop around…