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Show your support with a Thoroughbred Diesel t-shirt, sweatshirt, or sticker decal.
Thoroughbred Sku #: DSTALTP65 Manufacturer Sku #: ALTP65
Year/Make/Model: {{year}} {{make.Name}} {{model.Name}} Edit
$42.00
1985 - 2004 Chevy C/K Series 1500
1985 - 2004 Chevy C/K Series 2500
1985 - 2004 Chevy C/K Series 3500
1985 - 2004 GMC C/K Series 1500
1985 - 2004 GMC C/K Series 2500
1985 - 2004 GMC C/K Series 3500
Product Name: DieselSite 6.5L Chevy/GMC Alternator Pulley Manufacturer: Diesel Site Manufacturer Part #: ALTP65 Thoroughbred Diesel Part #: DSTALTP65 Fitment Notes: 6.5L Chevy/GMC Alternator Pulley
The 6.5L diesel utilizes a pulley diameter unique to the diesel from all the GM gasoline engine counterparts. The 6.5L diesel uses the alternator RPM for the tachometer. The problem comes in to play when you buy a new or reman alternator. The rebuilders almost exclusively use the gas alternator pulley which is readily available. The diesel pulley is no longer available.
When this gasoline version is used, the rpms on the dash are no longer correct. The 2nd, even larger issue, is the belt tensioner falls out of range and the belt is too long causing a squeaky belt and shorter belt life. Changing to this pulley fixes the dash rpms, brings the belt tensioner back to center and provides proper belt tension for maximum life.
This pulley is made of 6061 aluminum anodized for corrosion resistance.
How to tell if you have the wrong pulley on your vehicle? Measure the outside diameter of the pulley flange. You do not need to pull the belt off measuring this way. If your pulley is approximately 2.36" OD, you have the wrong one and need ours.
DieselSite 6.5L Chevy/GMC Alternator Pulley Features: