Is the idle pulley and tension pulley the exact same pulley on a 2010 5.7 tundra?

No. They are two different things. The tension pulley sits a bit lower in the engine bay than the idler pulley. For the tension pulley you need to order the Dayco 89378 Belt Tensioner Assembly.

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⚙️ Drive with confidence, powered by precision engineering.

TRUSTED LEGACY SINCE 1905 - Dayco’s global reputation means you’re investing in proven quality and cutting-edge automotive technology.
BUILT TO BRAVE THE ELEMENTS - Superior resistance to dirt, salt, and chemicals keeps your engine running cleaner and quieter.
VIBRATION REDUCING INNOVATION - Glass-filled polymer and spun steel construction deliver smoother surfaces and tighter tolerances to extend belt life.
ENGINEERED FOR PEAK PERFORMANCE - State-of-the-art CAD and FEA design ensures maximum structural integrity and longevity.
SEALED BEARINGS FOR RELIABILITY - High-temperature seals and lubricated bearings guarantee consistent, noise-free operation under pressure.

The Dayco 89502 Idler/Tensioner Pulley is a premium replacement part engineered with advanced CAD and FEA technology. Featuring durable spun steel and glass-filled polymer construction, it reduces vibrations and extends belt life. Equipped with high-temperature sealed lubricated bearings, it offers reliable, quiet performance while resisting dirt, salt, and chemicals. Trusted globally since 1905, Dayco delivers unmatched quality for your engine’s accessory drive system.

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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

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Manufacturer	Dayco
Brand	Dayco
Model	Tensioner Pulley
Product Dimensions	13.46 x 13.46 x 4.32 cm; 453.59 g
Item model number	89502
Manufacturer Part Number	89502
Position	Center
Item Weight	454 g

Dayco 89502 Idler/Tensioner Pulley

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