Going on a 2 hour trip up to Maine from nh. All highway. Running my 7.3 idi turbo 5 speed with 4:10's. Think it will be a rough ride? Going about 60 in 5th the truck is at almost 2000 rpm. And I'm probly gunna be going 70 all the way there. Only thing that makes me nervous is something has been up with the clutch since I bought it. Was brand new but it tears through throw out bearings in a week and I have been running the same bearing for a year and it's noisey

 

The motor won't care; with the turbo on it(if adjusted right) it'll feel just fine running 2500-2800 RPM.
Heck, mine(with sufficient fuel) makes peak torque around 2800 too(which is about double the peak torque a NA engine makes at 1400 RPM).
If you were running NA, I'd say you might have some issues going 70+ up big hills... back when I had a NA truck, I noticed a distinct lack of power when going 70-75... It would do it, but not accelerate very quickly - Mainly because the torque drops off with RPM, but the torque needed to maintain that speed increases due to wind resistance.

I routinely run 75 with my current truck(93, 4x4, turbo, 4:10s, 5-speed), though it doesn't really like to go much faster than that for long periods of time - it has no problem accelerating to 90+ very smoothly and quickly, but there's a little vibration going on at steady-state.

Towing, well, I've towed at 8-9K at 75 too; it'll do that just fine as well, though I started to run into clutch slipping issues giving it full power; it's time for a new clutch.

Uh... Pretty sure that means you have an issue with how that clutch was machined... something isn't running true to the centerline of the transmission input shaft.
When you put in the clutch, did you use a new flywheel?
If so, that flywheel might not have been drilled right.

If not, it's probably pressure plate related.

 

I'll be up that way in a few weeks, coming from Philly area. My IDI had done the trip towing several times now no issues aside from down to 30 MPH pulling a load up some grades on account of EGT. Not sure what you mean by rough? Mine rides smooth and very comfortable. My 460 truck which is lifted rides rough but it's set up for deep mud and highways are smooth for the most part so comfortable enough, just fired her up the other day and put 500 to VA and back after sitting since last time we got snow. Did fine, just rougher ride and loud tires compared to IDI truck.

 

The previous owner did a sb clutch kit with flywheel and he said after about 3 weeks the throw out bearings made noise. And he only used this truck to tow occasionally and it sat almost a year before I bought it which was almost a year and a half ago. Then o did a new bearing and 2 weeks later it was making noise and no I didn't notice anything visually wrong. He claims he only ran the truck a couple months after clutch kit before parking it.

 

Another thing I'm nervous about is the mechanical pump crapping out and leaking into crank case on me. I have no clue if it's original and it's fine now but you know how it is. If it's gunna go bad it will be at the worst time possible. Yruck has 182k on it

 

Then throw a new lift pump onit about 30 bucks

 

And only a few minutes. It's not a big deal to replace at all.

Typically, though, they don't leak into the crank case but out onto the ground. The risk of crank-case leak has more to do with putting a pressure source before it(aka an electric pump) which will then pressurize the diaphragm.