Car shakes from 60 to 80 mph, not tires, wheels or alignment

A while ago I faced a similar issue. My problem was the tie rods. Quick interjection, you should replace them in pairs. Just like headlights, if one fails, the other is close behind it.

Let's go down a list of possibilities:

• Tie Rod Inners (You said you replaced the end, which signifies outer to me)
• Control Arm Ball Joints (front and rear)
• Wheel Bearings (front and rear)
• Bushings
• Steering Rack
• Subframe

The last two are unlikely. I doubt you'd have problems in your steering rack or with the subframe/subframe mounts.

As for the other possibilities, get the car safely in the air and try to move the wheels by hand. If you grab the wheel at 9 and 3 and shake, you should feel very little play, and only on the front wheels. The rear should be solid. Trying again at 12 and 6, you should have no play. Any play at all can signify your problem. This will help check your tie rods and wheel bearings.

To check your bushings, you can manually try to flex the linked components. The bushings should feel stiff, but pliable. Easy or excessive movement is a problem.

Checking ball joints can be harder since they're usually tightened down tight enough that yo can't feel play in them easily. If you can feel play, there's obviously a problem, but without removing them and testing the ball joint itself, it's harder to diagnose.