Differential Unit problems of the 2004 Toyota Sequoia

The rear differential housing has rusted to the point that the lubricant leaked out. I understand talking to the dealership this a common problem along with the frame rusting. If I had not noticed the oil puddle on the ground I would have continued to drive this vehicle until the rear differential gears seized. Need I say more? if the rear end became inoperable this vehicle would go out of control.

"howling" noise from drive train on trip from northern California to southern California. At destination brand dealership determined front bearing is bad, and was advised next day by phone the differential needed overhaul and the repair cost would be $1,800 +, and not advisable to drive back home in northern California. The 2004 Toyota Sequoia vehicle only had 29,606 miles, 5 years 8 months old. Parts were not available/stocked at dealership. Was told those items rarely need replacing. Repairs made 4 days later. Service manager suggested pursuing Toyota for at least parts coverage. I paid his "discounted" bill for $1,342. 59 so I can return home. 3 nights of hotel bills. Old parts were not given to me upon request. To date Toyota has denied claim.

When I was going up a hill / dirt road in 4wheel high, at the midway point up, the engine lost power, I had the accelerator to the floor and the brake light came on and would not go off. It felt like brakes were being applied automatically. I put the gearshift in park and neutral put gear in 4 low and 4 high with and without center differential locked and unlocked with no results, vehicle would not accelerate uphill. I then had to reverse down to a level area, which was very dangerous as there was no room to turn around, after reaching a more level area, I turn off engine for about 20 minutes and when I restarted I was able to go downhill and left early from my trip as I dont want to be in this kind of dangerous situation again. Also my air conditioner is putting out strong pungent smells. I tried to clear the air by putting lever in fresh air mode as suggested by your tech, but intermittently the smell.