The Nations SP Series AD-275SP alternator was designed to fit ALL GM Trucks and SUV's with the 4.3L V6 and 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L, and 8.1L V-8 Gas engines as well as 6.6L Duramax Diesel engines from 1996-2006 in all GM Trucks and SUV's. It fits vehicles such as Chevy Tahoe, Chevy Suburban, Chevy S-10 & Blazer, Cadillac Escalade, Hummer H2, Chevy Silverado, GMC Sierra, and GMC Yukon Denali.

At Nations Starter Alternator, we are THE GM High Output alternator specialists, and we know the answer to getting you the alternator you need for your GM truck or SUV! The OEM alternators on most GM trucks and SUV's were rated at either 100-105 Amps, or 145 Amps, and the small case alternators only made 70 amps at idle! The AD275SP will make more output at idle, 185 Amps,plus at crusing speeds! than ANY of the stock alternators used on GM trucks and SUV's make at full output! With this High Output alternator you are gaining an incredible 100 amps of extra output, at idle, AND 140 amps

If your looking for the best overall performing High Output alternator available ANYWHERE, this is it!! Simply put, there isn't another alternator that will match the 275SP for output under all conditions!

These alternators are NOT just overwound stock alternators with low or zero output at idle like the competition sells that just dont work, The Nations AD 275SP series alternator is a specially designed Large Case alternator that weighs over 4lbs more than the stock GM large case alternator, and is capable of producing the large amounts of output that other alternators are just not capable of! Don't be fooled by other manufacturers claims of their so-called high output alternators, their supposed "high output" alternators are no match for our AD-275SP Nations alternator.

All of our SP series alternators have our exclusive USA made and special hand wound, heavy duty stator windings that gives our alternators their incredible low speed output and also lets the alternator run much cooler than other stator windings and deliver unmatched performance!

With this alternator you have our guarantee that it will:

• Be a Direct Bolt on OEM fit with no modifications necessary which means easy installation!
• Give you super high performance at idle, 180 Amps so your vehicle will always have the power it needs.
• Is compatible with the vehicles computer for worry free, NO trouble code installation.
• Built from 100% BRAND-NEW USA made parts!
• Comes standard with our custom hard anodized billet aluminum pulley for MAXIMUM output at idle! Other companies charge as much as $60 extra for these pulleys!
• Comes with super heavy duty rectifiers that feature six, 75 amp diodes in Solid Copper heat sinks for optimal current transfer and optimum heat dissipation.
• Uses premium double sealed high temperature rated bearings from NTN and NSK on precision computer balanced rotors for maximum bearing life even under heavy loads.
• All of this adds up to be the best High- Amp replacement alternator available anywhere, sold at a competitive price and backed up with a full two year replacement warranty!