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I've experienced Hi-Tech rear axle problems, but not to the degree you have.
My right rear inner bearing begn spinning on on the hub, which allowed further bearing degradation to occur, resulting in a minor degree of hub wobble (the left rear also exhibited minor bearing spin on the hub but it never developed a failure).
The wobble allowed the brake rotor to oscillate within the caliper causing the pistons to be forced back into their recess each time I negotiated left and right turns. This resulted in a persistent spongy brake pedal. I pumped quarts of brake fluid through the system for nearly 2 years trying to rid the air I thought was present in the plumbing. It was after many frustrating hours, months and years into the spongy brake pedal problem before I discovered the wobble, tore the assembly down and found the spun and worn bearing assembly to be the root cause of several problems.
I then had both hubs resized slightly to allow for a tighter bearing/hub relationship, and then put on new inner and outer bearings, left and right rear. Fifteen hundred miles later the right rear inner bearing overheated, toasted the lubricant and about 25% of the bearings fractured. The failure occurred at 45 mph and sounded like someone had jammed multiple wooden broomsticks through one of the rear wheels, and each being suddenly snapped into pieces. It's amazing how much noise fracturing dry bearings make!!
Subsequent disassembly and inspection by a driveline specialist revealed bearing pre-load problems to exist because of an internal shim that was slightly improper in thickness.
Eight hundred miles after the most recent fix I'm enjoying my car, but now wonder what surprise may lie ahead now that I've read about your woes. By the way, my vehicle was constructed in 1994, is a big block car and I now have just 9,000 miles on it.
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