I found this truck for sale and he says it has a 4.9L Isuzu in it. Did GMC offer something different? The NPR's did not have a 4.9L in that year. I have spent hours and hours trying to find one of these engines for my jeep. This is such a great site. Thanks in advance.
AFAIK the W4 GMC, W4000 Chevy, and the NPR are all the same truck for a given year, just 'badge engineering', some might have different options than others depending on how they were 'ordered'.
As I understand it there are GMC/Chevy equivalents for allmost all the N&F series Isuzus (same difference, just the badges, I've even seen some at various West Coast port terminals with no badges on them yet).
It probably was a typo as the two choises were 3.9 liter diesel or 5.7 liter gasoline.
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