Grinding noises while accelerating – gearbox?

Hello fellow driver and co-driver, with my S40 II 2.4i BJ 2004 with 5speed manual transmission I (perhaps) have a problem with the gearbox. It is expressed by the fact that a grinding / grinding noise is heard during the ride in the vehicle. When accelerating it pulsates with the wheel speed (that is to say faster with increasing speed), in thrust mode it sounds more continuous. It only occurs when coupled in the 1st to 4th gear. The fifth gear is absolutely normal quiet. I still have the feeling that it gets louder with rising temperature. Speak louder in summer than in winter and louder in warm vehicles than after a cold start in the morning. It really doesn’t sound very healthy and is very audible in the second and third gears with slow driving, even with radio. I tried to record the noise once during the ride. I think you can hear it quite well: http://www.theleech.de/auto/reiß_gang1-5.mp3 Does anyone have a tip on what the still to my car: It has been lowered with R&S springs (from the previous owner) and so the left drive shaft had to be changed last year. Motor bearings on the top left and gear bearings have also changed before because of vibrations while driving. All in all, the car unfortunately drives like a sack of nuts, but I still like greetings, Felix