Four problems related to differential unit have been reported for the 2006 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Tundra based on all problems reported for the 2006 Tundra.
The rear differential cover plate is leaking gear oil. The cover plate is fixed in place not bolted on. The excessive corrosion of the entire rear axle assembly is the problem. The only solution is to replace the entire rear axle assembly. There is an existing recall for Toyota tacomas so I contacted Toyota and they will not address the problem without a recall initiated by NHTSA. Should this cover plate totally fail while on the highway the resulting in loss of control the resulting accident may cause loss of life for this vehicle and other vehicles traveling on the same highway.
Rusted brake lines, rusted differential leaking fluid.
Repetitive growling/whirring sound with vibration at approximately 35 mph at the front drivers side of vehicle. Taken to dealer for diagnosis. No problems found or noted. Taken back to dealer - same symptoms diagnosed as bad front differential in need of rebuilding/replacement.
'2006 Tundra dbl cab limited 2x4' the gears in the rear differential broke back in July 2012 at 55000 miles, Toyota dealer repaired it just as my warranty was about to expire then it just happend again on 10-9-14 at 71000 miles, exactly 8 years of the date when I bought it brand new in 10-9-06. Only 16000 miles on the new gears. Either the Toyota dealer didnt repair it right or the Tundras have crappy differentials. Ill never purchase a Toyota again, plus they're over priced.