Front end shutter noise
 

My Honda Civic has a shutter noise coming from the right front end of the car. It occurs between 20-40 mph. It's intermittent and last for a few seconds then starts again a few minutes later. Is it the transaxle, differential, or what? It started 400 miles after my transmission was rebuilt. Tires are 2 months old and alignment is new too. AAMCO is refusing to pull the transmission to check the differential gears.