Loud ZF and NBS Mercedes-Benz O405ST / ZF 4 HP 500 gearbox (TST #496)

Again, I say thanks to my friend Rúben Gonçalves for the wonderful photo. Technical specs: Bodywork: Mercedes-Benz Chassis: O405 Mk. II Engine: Mercedes-Benz OM 447 h-II naturally aspirated (241 PS power output and 883 Nm maximum input torque) / Euro 1 Gearbox: ZF 4 HP 500 4-speed automatic transmission with retarder Year of Manufacturing: 1994 Status: Active The route was number 124 (Costa da Caparica - Cacilhas). Interesting features: loud ZF and NBS system. Uninteresting features: none that I can think of.