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  • $50.23 MSRP: $94.80
    You Save: $44.57 (48%)
    Product Specifications
    • Other Names: Idler Pulley, Serpentine Idler Pulley
    • Item Dimensions: 7.1 x 4.1 x 4.1 inches
    • Item Weight: 1.20 Pounds
    • Fitment Type: Direct Replacement
    • Replaces: 12557819
    • Part Description: GMC C2500 Serpentine Idler Pulley
    More Info
  • Dorman OE Solutions Vacuum Pump Pulley for GMC C2500 - 300-702
    $80.03
    Product Specifications
    • Belt Type: Serpentine
    • Color: Black
    • Installation Hardware Included: No
    • Installation Instructions Included: No
    • Item Grade: Standard Replacement
    • Material: Steel
    • Mounting Hole Quantity: 1
    • OE Part Number: 15589757
    • Outside Diameter: 4.91
    • Package Contents: 1 Vacuum Pump Pulley
    • Pulley Type/Grooves: Smooth
    • UPC: 019495240006
    • Width: 0.98
    • Part Description: GMC C2500 OE Solutions Vacuum Pump Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 36177
    $36.61
    Product Specifications
    • Bearing Bore Inside Diameter 1: 12 mm
    • Contact Surface: V-Ribbed Grooved
    • Material: Steel
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • Outside Diameter: 85 mm
    • Pulley 1 Flanged: Yes
    • UPC: 072053392852
    • Width: 29 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • Dayco No Slack Light Duty Idler Tensioner Pulley for GMC C2500 - 89170
    $35.76
    Product Specifications
    • Bearing Inner Diameter 1: 12
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: N
    • Groove Quantity: 6
    • Material: Steel
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 90
    • Pulley Width: 30
    • UPC: 036687655264
    • Part Description: GMC C2500 No Slack Light Duty Idler Tensioner Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45982
    $24.73
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.625
    • Belt Width MM: 15.875
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: 4
    • I.D. MM: 17
    • Inside Diameter: 0.6875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 95.250
    • Outside Diameter: 3.750
    • Pulley Type: Idler Pulley
    • Pulley Width IN: .69
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459823
    • Width: 22.2
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38015
    $27.82
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: Smooth/Backside
    • Material: Thermoplastic
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 76 mm
    • Pulley 1 Flanged: No
    • UPC: 072053472349
    • Width: 26 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • Dayco No Slack Light Duty New Style Idler Tensioner Pulley for GMC C2500 - 89006
    $20.80
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 90
    • Pulley Width: 30
    • UPC: 038244156948
    • Part Description: GMC C2500 No Slack Light Duty New Style Idler Tensioner Pulley
    More Info
  • Four Seasons Idler Tensioner Pulley for GMC C2500 - 45935
    $21.77
    Product Specifications
    • Belt Type: Back Idler
    • Belt Width IN: 1.000
    • Belt Width MM: 28.575
    • Bore Dia. IN: .472
    • Color: Black
    • Groove Quantity: 6
    • I.D. MM: 32.0
    • Inside Diameter: 1.18
    • Material: Steel
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 90.488
    • Outside Diameter: 3.500
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.130
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361030800
    • Width: 30
    • Part Description: GMC C2500 Idler Tensioner Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38001
    $19.83
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 90 mm
    • Pulley 1 Flanged: No
    • UPC: 072053415254
    • Width: 30 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • Dayco No Slack Light Duty Idler Tensioner Pulley for GMC C2500 - 89007
    $17.51
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: Y
    • Material: Steel
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 76
    • Pulley Width: 31
    • UPC: 038244156955
    • Part Description: GMC C2500 No Slack Light Duty Idler Tensioner Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45066
    $18.07
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.750
    • Belt Width MM: 19.050
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: 6
    • I.D. MM: 17
    • Inside Diameter: 0.671875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 88.900
    • Outside Diameter: 3.500
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361450660
    • Width: 25.4
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38006
    $20.09
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 2.99"
    • Pulley 1 Flanged: No
    • UPC: 072053415308
    • Width: 30.5 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • $2.93 MSRP: $5.51
    You Save: $2.58 (47%)
    Product Specifications
    • Other Names: Idler Pulley
    • Item Dimensions: 4.4 x 4.4 x 1.6 inches
    • Item Weight: 1.10 Pounds
    • Fitment Type: Direct Replacement
    • Part Description: GMC C2500 Idler Pulley
    More Info
  • Dayco No Slack Light Duty Idler Tensioner Pulley for GMC C2500 - 89015
    $16.34
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: N
    • Groove Quantity: 6
    • Material: Polymer
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 70
    • Pulley Width: 28.3
    • UPC: 036687135353
    • Part Description: GMC C2500 No Slack Light Duty Idler Tensioner Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45010
    $16.40
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.875
    • Belt Width MM: 22.225
    • Bore Dia. IN: .69
    • Color: Black
    • Groove Quantity: 6
    • I.D. MM: 17.463
    • Inside Diameter: 0.6875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 109.538
    • Outside Diameter: 4.3125
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361450103
    • Width: 25.4
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38024
    $19.70
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: V-Ribbed
    • Material: Thermoplastic
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • Outside Diameter: 109 mm
    • Pulley 1 Flanged: Yes
    • UPC: 072053542004
    • Width: 26.3 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • Dayco No Slack Light Duty Idler Tensioner Pulley for GMC C2500 - 89009
    $14.52
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: N
    • Groove Quantity: 6
    • Material: Polymer
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 76
    • Pulley Width: 28.7
    • UPC: 038244156979
    • Part Description: GMC C2500 No Slack Light Duty Idler Tensioner Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45990
    $17.37
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .47
    • Color: Black
    • Groove Quantity: Smooth
    • I.D. MM: 12.0
    • Inside Diameter: 0.46875
    • Material: Steel
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 88.900
    • Outside Diameter: 3.500
    • Pulley Type: Back Idler
    • Pulley Width IN: 1
    • Pulley Width MM: 25.4
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459908
    • Width: 25.4
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38020
    $18.48
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: Smooth/Backside
    • Material: Steel
    • Number of Grooves: 0
    • Number Of Pulleys: 1
    • Outside Diameter: 3.54"
    • Pulley 1 Flanged: No
    • UPC: 072053525748
    • Width: 30.5 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • $66.46 MSRP: $125.42
    You Save: $58.96 (48%)
    Product Specifications
    • Other Names: Idler Pulley, Pulley, Serpentine Idler Pulley
    • Item Dimensions: 4.3 x 4.3 x 2.1 inches
    • Item Weight: 0.90 Pounds
    • Fitment Type: Direct Replacement
    • Replaces: 14102597
    • Part Description: GMC C2500 Serpentine Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38019
    $17.63
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: V-Ribbed Grooved
    • Material: Thermoplastic
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • Outside Diameter: 3.54"
    • Pulley 1 Flanged: Yes
    • UPC: 072053557510
    • Width: 26.3 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • $54.91 MSRP: $103.62
    You Save: $48.71 (48%)
    Product Specifications
    • Other Names: Idler Pulley, Serpentine Idler Pulley
    • Item Dimensions: 3.5 x 3.1 x 3.1 inches
    • Item Weight: 0.70 Pounds
    • Fitment Type: Direct Replacement
    • Replaces: 10239930
    • Part Description: GMC C2500 Serpentine Idler Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45975
    $14.77
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .69
    • Color: Black
    • Groove Quantity: Smooth
    • I.D. MM: 17
    • Inside Diameter: 0.6875
    • Material: Steel
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 88.900
    • Outside Diameter: 3.500
    • Pulley Type: Back Idler
    • Pulley Width IN: 1
    • Pulley Width MM: 25.4
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459755
    • Width: 25.4
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Grooved Drive Belt Idler Pulley for GMC C2500 - 38008
    $16.58
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: V-Ribbed Grooved
    • Material: Thermoplastic
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • Outside Diameter: 2.76"
    • Pulley 1 Flanged: Yes
    • UPC: 072053284232
    • Width: 25 mm
    • Part Description: GMC C2500 Drivealign Grooved Drive Belt Idler Pulley
    More Info
  • Four Seasons Back Drive Belt Idler Pulley for GMC C2500 - 45979
    $15.02
    Product Specifications
    • Belt Type: Back Idler
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: Smooth
    • I.D. MM: 17
    • Inside Diameter: 0.6875
    • Material: Steel
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 76.200
    • Outside Diameter: 3.000
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.18
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459793
    • Width: 30
    • Part Description: GMC C2500 Back Drive Belt Idler Pulley
    More Info
  • Gates Drivealign Drive Belt Idler Pulley for GMC C2500 - 38009
    $16.47
    Product Specifications
    • Bearing Bore Inside Diameter 1: 17 mm
    • Contact Surface: V-Ribbed Grooved
    • Material: Thermoplastic
    • Number of Grooves: 6
    • Number Of Pulleys: 1
    • Outside Diameter: 2.99"
    • Pulley 1 Flanged: Yes
    • UPC: 072053284256
    • Width: 25 mm
    • Part Description: GMC C2500 Drivealign Drive Belt Idler Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45971
    $13.64
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: .88
    • Belt Width MM: 22.4
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: 6
    • I.D. MM: 17
    • Inside Diameter: 0.671875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 76.0
    • Outside Diameter: 2.99
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.13
    • Pulley Width MM: 28.7
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459717
    • Width: 28.7
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45970
    $14.74
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 1.000
    • Belt Width MM: 25.400
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: Smooth
    • I.D. MM: 17
    • Inside Diameter: 0.671875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 95.250
    • Outside Diameter: 3.750
    • Pulley Type: Back Idler
    • Pulley Width IN: 1
    • Pulley Width MM: 25.4
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459700
    • Width: 25.4
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Four Seasons Drive Belt Idler Pulley for GMC C2500 - 45996
    $14.91
    Product Specifications
    • Belt Type: Serpentine
    • Belt Width IN: 0.875
    • Belt Width MM: 22.225
    • Bore Dia. IN: .67
    • Color: Black
    • Groove Quantity: 6
    • I.D. MM: 17
    • Inside Diameter: 0.671875
    • Material: Plastic
    • Meets / Exceeds OEM: Yes
    • Mount Hole Qty: 1
    • Mounting Hardware: Not Included
    • O.D. MM: 69.850
    • Outside Diameter: 2.750
    • Pulley Type: Idler Pulley
    • Pulley Width IN: 1.11
    • Pulley Width MM: Idler / Tensioner Pulley
    • Style: Idler / Tensioner Pulley
    • UPC: 096361459960
    • Width: 28.6
    • Part Description: GMC C2500 Drive Belt Idler Pulley
    More Info
  • Dayco No Slack Light Duty Idler Tensioner Pulley for GMC C2500 - 89012
    $22.75
    Product Specifications
    • Bearing Inner Diameter 1: 17
    • Bearing Width: 12
    • Belt Type: Serpentine
    • Flat: N
    • Groove Quantity: 6
    • Material: Polymer
    • Max Belt Width: 06 Rib
    • Number of Bearings: 1
    • Pulley Outside Diameter: 90
    • Pulley Width: 28.2
    • UPC: 038244528783
    • Part Description: GMC C2500 No Slack Light Duty Idler Tensioner Pulley
    More Info
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About GMC C2500 Idler Pulley

The GMC C2500 was first released in 1987 as a conventional four-wheel-drive variant. Over the years, it has earned a great reputation by beating out competitors. The GMC C2500 comes with plenty of quality parts, including the idler pulley. There can be one or more idler pulleys along the timing chain and each can come in different sizes. A faulty GMC C2500 idler pulley can cause overheating, stalling, and a decline in tension.
The GMC C2500 provides a large selection of high-performance parts. But after a long time, the worn idler pulley might cause huge problems. The removal process for the GMC C2500 idler pulley is as follows. First, open the hood. Next, remove the engine drive belt. Then locate the idler pulley, remove the mounting bolt for the idler pulley, and remove the pulley from the engine. The GMC C2500 idler pulley should be replaced every 50,000 to 100,000 miles. Choose from a vast selection of auto parts at varied prices online. We have nearly all types of GMC C2500 parts in our catalog to give you a better vehicle both inside and out.