Rear bearing problems

I have had the left rear wheel bearings replaced at 23,734 miles, and at 50,782 miles, L&R rear bearings and axles replaced at 52,760 miles, L rear bearing replaced again at 53,742 miles. Currently at 54,350 miles, I'm convinced both rear wheel bearings are going bad again, this is based on hub temperatures taken after a 65 mile trip. LR 202, RR 170 LF 119 RF 119. The only only service covered under warranty was the initial bearing. Every technicians/ mechanics initial comment is Wow this doesn't happen to Toyotas. I'm looking for an experienced technician to give me some advice.

 

ummm... are temperatures the only thing you are going by? How did the bearings look when they were removed? Any noise? How are you checking the temperature? You sure it isn't warm from that brake dragging?

 

Do you by chance back a boat into the water often? Is the diff breather clogged? Have you relocated the diff breather with the proper fitting and hose?

 

Not a tech, but I did investigate this is an issue... which isn't super rare. Toyota supposedly fixed it around 2014?... but they really didn't.

My conclusion/guess is that it's tolerance. Something in the assembly is off enough to preload the bearings and cause them to fail. It will keep happening unless that is fixed.

What symptoms did you notice as the bearings were failing?

 

The bearing usually began to grind.One time it blew oil out the back. I do not have a boat. The vehicle has never been in an accident. Five different Toyota technicians have serviced this vehicle for this issue. I have to believe they checked the breather. The last Technician stated the camber is off by 1.5 degrees. My thought the camber being off is the result of the bearing being bad again.

 

Rear camber is off 1.5 degrees? That should be visually noticeable... and a lot. Bent axle housing, maybe?

 

The original tires were replaced at 50,000 miles without any noticeable wear. No accidents and original suspension parts- nothing bent or twisted. My theory is the fill hole on the differential is too low. The oil from the differential cannot get into the axle housing and lubricate the bearings. I will post a picture when my tech support returns. Question: Can a bad bearing affect the camber? Does the oil in the differential lubricate and cool the rear bearings?

 

Since we have a solid rear axle, the only way camber could be off that much is if the housing is bent (see below). Or maybe the tech is an idiot or meant something else.

The filler hole isn't low. Hub bearings are sealed and not lubed by the diff fluid.

 

Maybe someone else borrowed your truck at some point and bent the axle housing by bashing the tire into something while sliding on ice or a wet road. One could always pull the wheel off and use a dial indicator to see if the axle has been slightly bent.