What's wrong with my van?

I was just given a van by a sweet couple who knew I was struggling as a single mom. Its a 2005 ford freestar. The problem is when I get on the highway and get going between 50-65 it shakes for a few seconds and then stops. If I let off the gas it stops, and of I push the gas harder it stops. I have floored it and it shifted smoothly through all the gears and did not shake. I just wanted to see if anyone had any suggestions as to what the problem could be. I'm kinda nervous to drive it far in case something happens.

Abs light and brake light on. Vehicle shakes 30-70 MPH?

I drive a 1996 Ford Aerostar and about a week ago my ABS light and brake light came on. They only come on for a couple seconds, right when I start up the van. Then when I'm driving and I get to speeds between 30-70 mph, the van begins to shake a lot. I checked my brake fluid and it is a little under the max. Does anyone know what could be causing this? And if I can fix it at home or will I have to take it to a shop(and how much $?) Thank you.

Why my car stops accelerating while driving?

Have a Ford Fussion 2007. I was driving at about 40MPH and my car suddenly stops moving like if it was on neutral it accelerate by it self wth out moving even though it was on drive. I pulled over, turn it off and started again and it took me back home normally but now it did it again I took it to a mechanic and he put it in the computer but he says nothing is showing it seems that everything is ok but that car now is not moving! It only goes on reverse or low driving but not drive

Wheel bearing noise, 91 cherokee?

I've got a 91 jeep Cherokee sport 4x4 5speed. And just recently it developed a noise that sounds just like a wheel bearing going out. Happens at speed 30mph+.

I narrowed it down to the front right. So I replaced everything at once, (both wheel bearing/hubs, both axle u-joints, both axle seals, both upper and lower ball joints, the tier rod end at the pitman arm-adjusting sleeve-drag link, and bot tie rod ends of the tie rod, and the track bar lower bushings.)
Got an alignment, and the noise is still there.

I remembered my transfer case leaks so I drained it (very little and black gear oil.) And then topped it off with fresh oil and took it for a drive. Noise seemed to be gone. But now this morning on my way to work the noise was back and just as loud.

I doubt it's the front axle bearings by the diff. I also doubt it's my rear axle, because the whole axle was rebuilt completely with an Eaton Detroit locker. (Ford 8.8 axle)

It could be my front driveshaft (it's the 4 driveshaft I've swapped in one year) or the rear driveshaft. But I don't believe u-joints would imitate a wheel bearing howl.

Just a month ago I changed engine oil, transmission oil, and front and rear diff oil. (Obviously forgot the t-case) so I don't see how an internal bearing could be going.

And like I said it's dependent on speed only, not engine rpm.

Any brainstorming is greatly appreciated.

(I do know that I need new heim joints on both of my long arms at the chassis end.)