Table 1 shows eleven common power train related problems of the 2003 Toyota Tundra. The number one most common problem is related to the differential unit (14 problems). The second most common problem is related to the power train (seven problems).
I am a retired Toyota master diagnostic technician. As I was replacing my rear brake lines on my 2003 Tundra-with 79,962 miles, I saw a fluid leak under rear of vehicle. Upon inspection I found the rear differential housing has rusted so badly that the gear oil is leaking through the housing. Read details...
The frame has failed by rusting through and continues to the brake line. It is available for inspection. The truck is no longer safe to drive due to the rust and brake issues. The truck frame could have failed in traffic causing harm to myself and other drivers. Read details...
Entire rear end housing rusted away requiring a whole new rear end housing. Frame is rusting out on whole truck. Read details...