Gearing and the rpms they turn.

 

Higher RPM's, 4-550's are geared way lower…..

 

Can't be much lower, 4.88 I guess. Isn't that as low as they go" mines a 4.30. I wonder what the newer 450s have. i looked at a DRW F350 the other day and the rear axle was 3.73. I've had this discussion before but I continue to think that the loss of power at the rear axle can not be compensated for with a transmission. But I keep getting told I'm crazy.

 

The updated front cover has a vertical tab structure at the bottom of the pump volute. Presumably their flow modeling / analysis indicated that would reduce or eliminate the cavitation. I don't recall reading about any of the updated ones showing cavitation damage but I believe the updated version has been out a year or two so perhaps it hasn't been looked at yet.

 

Very nice info.

 

We are getting ready to put on the new front cover, here are the differences on that tab structure

 

has anyone seen or addressed this problem? we found two wires that control the injectors, the insulation is rubbed through, and this would could major issues with injectors, its right under neath the air intake piping. fyi i guess. we are going to be able to repair the wiring and then put some protectors on them.