Will a 68 Camaro rear axle fit under 55 Chevy?

No, a 68 Camaro rear axle will not fit under a 55 Chevy without significant modifications, likely too significant to be practical. The 1955 Chevy has a much narrower track width and a different suspension design compared to the 1968 Camaro. You'd be dealing with:

* Track width: The Camaro's rear axle is significantly wider.

* Spring perches: The location and design of the spring perches are completely different.

* Suspension: The 55 Chevy uses a leaf spring suspension while the Camaro likely uses a coil spring or a similar independent rear suspension (depending on the specific Camaro model).

* Axle tube diameter and length: These are likely different as well.

While you *could* potentially modify the frame, fabricate custom mounts, and adjust the suspension, the amount of work required would be extensive and expensive, likely exceeding the cost of finding a more suitable rear end. It's not a simple bolt-on swap.