ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck
ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck
What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality. 99-04 4.8, 5.3, 6.0 25% Harmonic Dampner
ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck, ASP Underdrive Pulley 25% Underdrive / 23% alt 4.8, 5.3, 6.0 Truck
ASP Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. Auto mechanics use ASP underdrive pulleys as a replacement pulley that contains a different ratio and material specifications that free up lost horsepower. By using an ASP underdrive pulley, you are increasing the diameter of each accessory pulley and decreasing the ratio of the crank pulley. The speed at which the accessories are turning relative to the engine's rpm's decrease.
By installing a resized Auto Specialties Performance pulley, the accessories are slowed. This results in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG.
Why should you buy a Auto Specialties Performance underdrive pulley? Auto Specialties Performance has been in operation since 1988. All ASP pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality. ASP pulleys start out as as a solid bar of either 6061-T6 Alum or 1045-carbon steel.
If you were able to tour the Auto Specialties Performance factory you would be able to see for yourself how intricate and exacting the production process is from the beginning where all of the solid bars have to be cut to size using an automatic saw that can cut within .010 of an inch. Next they are machine lathed with specifications that can be tweaked to as little as .0003 thousandths of an inch for a perfect fit and then any necessary millwork takes place. And for the most important part, quality control procedures are tantamount at the facility safeguards are in place at all stages of the total operation to assure that the customer gets a product that is manufactured to perfection. From this visit it would be easy to see why Auto Specialties Performance (ASP) has been the leader in the underdrive pulley market for twenty years and why they should be trusted with you are in the market for and underdrive part .
The ASP UNDERDRIVE CRANK AND UNDERDRIVE ALTERNATOR PULLEY that is SFI approved racing for your 1998-02 Firebird V8 can give you back some of the much needed horsepower that is stolen by your water pump, A/C compressor and power steering when powered by a factory installed pulley and as a plus you can see up to a 15 percent increase in horsepower with the underdrive pulley system. And for better performance in your Corvette consider the ASP Underdrive Pulley SFI Approved 25% Harmonic DAMPNER Crank for a reduction in crankshaft torsional vibration, greater valve train and timing efficiency and a reduction in wear to the car’s main bearings, oil pump and crankshaft. And if you are on the racing circuit with your Camaro you might be interested in the ASP LT-1 pulley 23% Crank 'Nitride' Camaro 1993-97 V8 with its nitride coating that diffuses nitrogen into the surface creating a much harder surface and more durable product so important considering the rigors of racing. If you're looking for a performance exhaust, check out our Borla Exhaust Systems here!
IMAGES: Images may be a representation and may not reflect the actual product.
California Residents: Prop 65 WARNING: This product MAY contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov
California Residents: TIRE WARNING: LMPerformance will not ship Tires to California.
Legal: Some or all of these parts may not comply with Federal, State, Province, and/or Local laws, ordinances, and regulations. Buyer takes all responsibility to ensure that any modifications or upgrades that have done conform to all applicable laws and regulations for road use, especially pertaining to safety and emissions. LMPerformance is not responsible for buyer not complying with Federal, State, Province, and/or Local laws, ordinances, and regulations. This policy shall be in force for all past, current, and future purchases from LMPerformance, Inc. LMPerformance will not ship ANY non-CARB compliant products to California where California requires products to be CARB certified such as Catalytic Converters and Induction Kits.
FREE SHIPPING: Please note FREE Shipping refers to shipping within the contiguous continental US only. All other locations extra. Some items that require Truck Freight Delivery will require a Truck Freight surcharge. This surcharge is still a discounted shipping amount that is lower then the actual truck freight shipping charge that is charged to LMP. LMP will try to still give the lowest price possible for truck freight items.
IMAGES: Images may be a representation and may not reflect the actual product. Examples would be SPEC stage 3 clutch kits which all use the same photo.
TYPOS: LMPerformance tries to present the best most accurate information on our website. Sometimes we get mistakes in product information sent from vendors such as typos. We can not be responsible for these typos, if you see something that does not look right please let us know before ordering so we can double check for you first. LMPerformance will not pay for typos in any way, monetarily or otherwise.
SPECIAL ORDER ITEMS: Some items are special ordered and may not be returnable, or even cancellable as they are going into production specifically because you ordered them. Special ordered items can have a 5-35% cancelation fee.
Cancellations: Instock orders cannot be canceled due to our automated ordering & fast shipping system. To keep our prices low, all cancelations are subject to a 5% cancelation fee to cover transaction processing fees. We reserve the right to charge up to a 10% cancellation fee for cancelled orders due to merchant fees, special order fees and the cost of processing and shipping orders.When you request a cancellation of an order or a part, please note that it may take time for a manufacturer to cancel an order if the order is drop-shipped. We also have to confirm that the product has not shipped. If the product has shipped then this must be processed as a return.Also note that sometimes products ship more quickly than expected, so we recommend that you do not purchase alternative products until receiving final confirmation of the cancellation.
Returns:We cannot accept returns on parts that have been used or installed. No returns will be accepted after 30 days. All Returns must be in original packaging. Prior authorization must be given before any return can be made. Up to a 25% Restocking Fee may apply. Special orders may be subject to Additional Manufacturer Restock Fees as well. Shipping cost will not be refunded.Hoods as well as PCM Programmers may not be returned unless defective and only for replacement. ALL returns must be first filed using our online form found here: https://www.lmperformance.com/returns.
Lost Order ClaimsAll lost order/package claims must be made within 5 days of the shipping date or tracking information delivery date. All claimes made after this date will not be accepted due to Shipping companies policies of filing loss claims.
Damaged Items or Incorrect Items: Please contact us right away if your item has been damaged in shipping or are incorrect. Please note that we will ship replacement items the same method of shipping the order was originally placed for. LMPerformance can not ship packages overnight at our cost if the original shipping was not also overnight. Claims must be filed in order for replacement parts to be shipped.
Warranties:Any warranty claims must be placed with the manufacturer. All of the products sold by LMPerformance, regardless of the manufacturer, are designed for Racing and Performance applications. Many of our manufacturers offer NO WARRANTY on their products, either stated or implied, due to the unusual stresses placed on the parts and because we have no control over how they are installed and used. Many of these products are designed for off-road use only and are not legal for use on public highways. If you have a question about the warranty on a specific product, please e-mail or call us. Buyer assumes all risk and liability associated with these products.
Installation:We are not responsible for or any costs associated with the installation or the improper installation of any products. Purchaser assumes the risk associated with the installation of products. We, along with the manufacturer of each product are not responsible for any direct or indirect damage to the vehicle, personal, or costs incurred from the use of products.
Starting at 0% Order Now, Pay Later Learn More.
