All Things Chev

[the evil twin]

to all you 6.5 owners out there, is 1800rpm at 100kph ok? or should the rpm be lower or higher?

That is about what mine tonks along at (1850 ish is 100 ish but I sit a tad under) and it seems to be the sweet spot (33 inch tyres 3.9 diffs and 4L85 tranny).
When I put the 35's on it is def not as happy on the bitumen (runs a tad hotter and uses more fuel esp if the Van is attached).

But... mine is not a P400 and those Cobras' are pretty much a different critter entirely to the older 6.5's.