HomeBelts and Cooling > Accessory Drive Belt System ComponentsFour Seasons 45904 Accessory Drive Belt Tensioner Pulley
Part #: 45904

Four Seasons 45904 Accessory Drive Belt Tensioner Pulley

Pulley
⚙️ 44 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$28.03Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
📦Pulley
🚗Fitment: Mitsubishi, Chrysler, and Dodge, Eclipse, Endeavor, Galant, Sebring, Stratus, and Diamante
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Accessory Drive Belt Tensioner Pulley for Chrysler, Dodge, Mitsubishi

The Four Seasons Pulley 45904 is a precision-engineered accessory drive belt tensioner pulley designed for select Chrysler, Dodge, and Mitsubishi vehicles. This idler pulley ensures proper belt tension and smooth operation of the accessory drive system, contributing to overall engine performance and reliability.

  • Constructed from durable metal with a black finish for corrosion resistance
  • Outside diameter of 3.5625 inches (90.488 mm) and width of 1.25 inches (31.8 mm)
  • Smooth groove design compatible with back idler belt types
  • Inside diameter of 0.40625 inches (10.160 mm) with a bore diameter of 0.399 inches
  • Meets or exceeds OEM specifications for reliable fit and function
  • Single mount hole design; mounting hardware not included

Four Seasons Pulley Product Line Overview

The Four Seasons Pulley line focuses on high-quality pulley components engineered to meet or exceed original equipment manufacturer standards. This product line emphasizes durability and precise fitment, making it suitable for accessory drive belt systems in various vehicle makes and models. The 45904 idler pulley is part of this line, offering consistent performance for Chrysler, Dodge, and Mitsubishi vehicles requiring a back idler belt pulley.

Product Details and Specifications

This accessory drive belt tensioner pulley features a metal construction with a black finish, providing strength and resistance to wear. The smooth groove design is optimized for back idler belt types, ensuring proper belt tracking and tension. With an outside diameter of 3.5625 inches and a width of 1.25 inches, it fits securely within the accessory drive system. The inside diameter measures 0.40625 inches, with a bore diameter of 0.399 inches, designed for precise mounting. This pulley is compatible with Chrysler, Dodge, and Mitsubishi models including the Diamante, Eclipse, Endeavor, Galant, Sebring, and Stratus.

Common Applications and Issues Addressed

  • Restores proper belt tension to prevent slipping or noise
  • Replaces worn or damaged idler pulleys causing belt misalignment
  • Eliminates squealing or chirping sounds from the accessory drive system
  • Prevents premature belt wear due to pulley surface damage
  • Ensures smooth operation of alternator, power steering, and A/C belts

Installation Notes and Tips

Installation requires removal of the old idler pulley and mounting this replacement using the existing hardware, as mounting hardware is not included. Verify the pulley orientation and belt routing before installation. Use appropriate tools to torque the pulley bolt to manufacturer specifications. Inspect the accessory drive belt for wear during installation and replace if necessary to ensure optimal system performance.

Quality Assurance and Warranty

The Four Seasons Pulley 45904 meets or exceeds OEM standards, ensuring reliable fit and function. Manufactured with high-quality metal materials, this pulley is designed for durability and long service life. While specific warranty details are not provided, Four Seasons products typically come with a limited warranty against defects in material and workmanship.

BrandFour Seasons
Part Number45904
PositionPulley
Belt TypeBack Idler
Belt Width IN0.9375
Belt Width MM23.8125
Bore Dia. IN.399
ColorBlack
DescriptionIdler Pulley
Groove QuantitySmooth
I.D. MM10.160
Inside Diameter0.40625
MaterialMetal
Meets / Exceeds OEM?Yes
Mount Hole Qty1
Mounting Hardware?Not Included
O.D. MM90.488
Outside Diameter3.5625
Pulley TypeIdler Pulley
Pulley Width IN1.25
Pulley Width MM31.8
StyleIdler Pulley
TypePulley
Width31.8

This part fits 44 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2012MitsubishiEclipse3.8LV6N/APulley
2011MitsubishiEclipse3.8LV6N/APulley
2011MitsubishiEndeavorN/APulley
2010MitsubishiEclipse3.8LV6N/APulley
2010MitsubishiEndeavorN/APulley
2009MitsubishiEclipse3.8LV6N/APulley
2009MitsubishiEndeavorN/APulley
2009MitsubishiGalant3.8LV6N/APulley
2008MitsubishiEclipse3.8LV6N/APulley
2008MitsubishiEndeavorN/APulley
2008MitsubishiGalant3.8LV6N/APulley
2007MitsubishiEclipse3.8LV6N/APulley
2007MitsubishiEndeavorN/APulley
2007MitsubishiGalant3.8LV6N/APulley
2006MitsubishiEclipse3.8LV6N/APulley
2006MitsubishiEndeavorN/APulley
2006MitsubishiGalant3.8LV6N/APulley
2005ChryslerSebring3.0LV6N/APulley
2005DodgeStratus3.0LV6N/APulley
2005MitsubishiEndeavorN/APulley
2005MitsubishiGalant3.8LV6N/APulley
2004ChryslerSebring3.0LV6N/APulley
2004DodgeStratus3.0LV6N/APulley
2004MitsubishiDiamanteN/APulley
2004MitsubishiEndeavorN/APulley
2004MitsubishiGalant3.8LV6N/APulley
2003ChryslerSebring3.0LV6N/APulley
2003DodgeStratus3.0LV6N/APulley
2003MitsubishiDiamanteN/APulley
2003MitsubishiGalant3.0LV6N/APulley
2002ChryslerSebring3.0LV6N/APulley
2002DodgeStratus3.0LV6N/APulley
2002MitsubishiDiamanteN/APulley
2002MitsubishiGalant3.0LV6N/APulley
2001ChryslerSebring3.0LV6N/APulley
2001DodgeStratus3.0LV6N/APulley
2001MitsubishiDiamanteN/APulley
2001MitsubishiGalant3.0LV6N/APulley
2000MitsubishiDiamanteN/APulley
2000MitsubishiGalant3.0LV6N/APulley
1999MitsubishiDiamanteN/APulley
1999MitsubishiGalant3.0LV6N/APulley
1998MitsubishiDiamanteN/APulley
1997MitsubishiDiamanteN/APulley

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

361924590449133590483590489138A79776MD309783

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.