If you have had he axle seals replaced, you should verify that the new style (90310 50006) was installed and not the old style (90310 50001). Also the TSB regarding these seals calls out a Special Service Tool that must be used, instead of what is listed in the Service Manual, not using the new tool can damage the seal assembly causing it to leak. You also said you used synthetic, but not what brand, according to TSB DL003-03 "Toyota Genuine Synthetic Differential Gear Oil (P/N 00289–75140) CANNOT be used in
2000–2002 Tundra vehicles and 2001–2002 Sequoia vehicles. The rear axle oil seals are not compatible and will leak if synthetic differential gear oils are used in these vehicles."
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~Glenn
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