The NV4500 tranny is pretty tough behind a 6.5. A modified Cummins can eat it but behind the 6.5 its a pretty good match. I think its a good tranny. The Clutch is a different story, thats a little weak but OK.
The late 90's IIRC 96.5-98 are the weakest blocks w/ piston oil spray cooling and weak casting material. Several have cracked but more are still running ok.
All bets are off at 225K miles in my opinion unless you know the details. Hows it been used and what shape is it in etc ???? You mention its in showroom condition. Is that looks or is it really clean and well maintained??? Any modifications? It would have to be an economical buy and you willing to do the next level of maintenance when required. As you are probably aware diesels are pretty economical up to 100-150K then the bigger maintenance items need attention.
If you are happy with the 6.2 then the 6.5 should be OK there is not much difference. Give more info on what you'll be doing with it and if you like tinkering or want to modify for performance etc. Also, how well you turn wrenches and others will be more willing to give thier opinion.
Last edited by Hubert; 03-25-2006 at 13:08.
97 5spd K2500 Ext Cab short Bed ~160K miles.
TM, 3" downpipe & 4" exhaust, remote FSD, remote oilfilter, Gauges: EGT, Boost, Fuel Pressure, B&W Gooseneck Turnover ball, Prodigy Brake Controller. Hi-Temp Hydraulic Oil Cooler Lines.
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