68 GTX Rear Axle Bearing Help

It sounds like you have an 8 3/4”. Now, a couple things you can do to help identify what you have inside would be...

1) Jack the car up so both wheels are off the ground. With the car in neutral, spin one wheel and watch the other side to see if it spins the same way. If it does, you have a Suregrip, or “posi”. If the other wheel spins the opposite direction, or not at all, it is an open rear.

2) If it spins the same way, take a piece of chalk, crawl under the car and put a mark on the driveshaft. Now, spin the wheel one revolution, and count the number of times the driveshaft turns. This will tell you the ratio of the gear set. For example, if it turns a little over 3 turns, it is a commonly available rear gear of 3:23, meaning it turned 3 1/4 turns to one revolution of the tire.

Finding out if it is a Suregrip will ease your mind about the presence of the thrust button, whether to take extra care if you know it’s there.

Good luck brother, follow Rusty’s direction and you can’t go wrong.