Dayco 89378 belt tensioner for the 2007-2021 Toyota Tundra and other vehicles keeps the serpentine belt under tension automatically. This Dayco belt tensioner has a single flat pulley.
A worn serpentine belt tensioner can show up as a squealing or chirping belt, a belt that flutters, or a pulley that looks crooked or rough. With the engine off and cool, look the belt over for cracks or glazing and the pulley for visible wear. A noisy belt can also come from the belt or another pulley, so find the cause first; if this tensioner is the cause, it replaces it.
The 2007-2021 Toyota Tundra, 2008-2022 Toyota Sequoia and 2010-2023 Lexus GX460 are among the vehicles this tensioner fits, and the Tundra takes one. The Tundra is listed with the V8-5.7L and V8-4.6L engines through 2019. If your vehicle is not one of these, look it up in the "Vehicles it fits" section to see whether it is covered.
Fit and size
Build and materials
Interchange: 39185 · 780223 · 49468 · 999202A
This part cross-references / interchanges with the following part numbers:
Is this the right Toyota Tundra belt tensioner for the 2007-2021 model years?
Yes. Dayco 89378 is listed for the 2007-2021 Toyota Tundra, with the V8-5.7L and V8-4.6L engines through 2019, and one tensioner per truck.
Can I use this Toyota Sequoia belt tensioner on the 2008-2022 Toyota Sequoia?
Yes. Dayco 89378 is listed for the 2008-2022 Toyota Sequoia, and each one takes a single tensioner.
What belt does the Dayco automatic belt tensioner 89378 work with?
It is made for a serpentine belt. Dayco 89378 is an automatic-type tensioner with one pulley.
What size is the pulley on the Dayco tensioner?
The single flat pulley is 76 mm in diameter and 38 mm wide, and the tensioner's direction is clockwise.
Does Dayco 89378 replace number 49468?
Yes. Dayco 89378 is listed as a replacement for number 49468.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
