first ISX engine I know nothing about it any help out there

[Chamberpains]

I think you should talk to Hammerhead on the forum here. He's one of our heaviest haulers. 9 axles may be some of his smaller stuff. He may be able to shed some light on what's a good setup and how long you can really expect to get out of the engine with that setup. Hopefully he'll be along and chime in. If not PM him and I'm sure he'll get to helping out.