I've owned my 1979 400 w/60" deck since 1993 and currently have ~1250 hrs on it. Last few years it seems to have lost some power and this year, mower deck gearbox and bearings made it so I couldn't move slow enough to cut lawn. I decided to get a newer mower that actually had a decent turning radius, with plenty of power and didn't want the cost of a new tractor. I ended up with a 2004 GX345 with ~475 hrs. So after 20 years of riding (and fixing) the 400, I'm skeptical of the newer, smaller tractor after mowing lawn once. First I thought I had a rod knock, but after listening to it a while it sounded more like a belt slap (mower not engaged). After getting under it I realized this is a belt drive. The 400 is a real tractor with a drive shaft power train. So I guess I'm looking for information on the GX345 reliability or issues I may have to address at some point. I have to say after getting the 400 with ~450 hrs and owning it 20+ years, that really sold me on John Deere, especially since I can still get many of the parts for a 34 year old tractor. Is the John Deere quality still there on newer models. I have to admit the 345 really makes cutting my lawn easier, with the added power and great turning radius, just questioning durability of this tractor.