I`ve only driven 1 lorry with a Gardner engine D355 GWX a Foden with the 320 in it and i thought it was a great motor,it was a very good puller it had a 9 speed Fuller and a Rockwell axle,i had it for around 8 months and never had a problem with it ,mind i did come off a Renault 290 GT dont know what the GT stood for but i had an idea 