Search  for anything...

ACDelco GM Genuine Parts 20881337 Alternator

  • Based on 317 reviews
Condition: New
Checking for the best price...
$170.50 Why this price?
Save $109.99 was $280.49

Buy Now, Pay Later


As low as $28.42 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund / replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: 12 left in stock
Fulfilled by Amazon

Arrives Thursday, Jul 2
Order within 10 hours and 48 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Features

  • Newly manufactured as an exact replacement for your GM vehicle's original alternator
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle

Description

GM Genuine Parts Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These alternators provide power to the vehicle's electrical systems and charge the battery while the engine is running. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Manufacturer: ‎ACDelco


Brand: ‎GM GENUINE PARTS


Model: ‎Alternator


Item Weight: ‎14.55 pounds


Product Dimensions: ‎8.7 x 7.7 x 7 inches


Item model number: ‎20881337


Is Discontinued By Manufacturer: ‎Yes


Exterior: ‎Machined


Manufacturer Part Number: ‎20881337


OEM Part Number: ‎20881337


Date First Available: October 30, 2010


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Genuine OEM Part in an OEM Box!
Genuine OEM part for my Avalanche with free shipping for @ a better price than an aftermarket part from my local auto parts store! Perfect fit and works great!!
Reviewed in the United States on May 3, 2026 by Jeff S.

  • Quality.
OEM part.
Reviewed in the United States on May 3, 2026 by Amazon Customer

  • You get what you pay for.
This works better than the cheap Chinese crap. It was very easy to install and corrected the generator error I was receiving.
Reviewed in the United States on May 2, 2026 by David M. Ritz

  • Great fit
Worked and fit well. Cheaper than going to the auto parts store.
Reviewed in the United States on May 11, 2026 by Donald Wolcott

  • Good product
Perfect exact match for my Chevy express . Works great
Reviewed in the United States on December 30, 2025 by Uncle dicky

  • Ok
As expected
Reviewed in the United States on January 15, 2026 by Tony Demarco

  • New alternator New alternator
Installation was quick and easy
Reviewed in the United States on March 23, 2026 Reviewed in the United States on March 23, 2026 by K.Ran

  • OE PARTS ARE NO THE BEST
Great quality !!! Awesome value, fit like a glove
Reviewed in the United States on June 2, 2026 by MJP wrenchman

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...