Thanks you for the welcome to the board re: my other post.

I was on a stretch of highway just sort of cruising and it seemed to be revving higher than I remember from the last highway drive. At 60 to 65, the tach is at 3000 RPM give or take. Is this high? It felt a little high to me, but after getting off and driving I made sure that fourth gear was cominmg into play. This is an '84 300 TD. Other than that, no probs except the speedo needle doesn't like to move now until I'm going 10 - 15 or so, then it jumps up.

I was thinking of taking a trip of about 250 miles each way for Thanksgiving but if something goes wrong I'm up a creek. I think I just answered my own question there. Well, what about the revs and as there isn't a redline on the tach, whats the story about revs and a diesel. I can't imagine long distance cruising at 3500+ RPMs. Seems harsh.

Theoretically your governor will limit the RPMs and not allow the engine to over rev no matter what you do...
The RPM range you describe does not sound that severe. In 4th gear i believe it is a direct drive and you will actually "redline" or max out around... think, think, I may be way off here but I think on my 240 it is like 4250 or something like that.

Im certain that someone more knowledgable than me in this area will confirm these numbers.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique

3k at 65 is about right. I noticed over the weekend at 3500 rpm I was running 82mph. At 3750 where the car loves to run I was around 87mph. These are not truck diesels, they like higher rpm's and are built for it.