Silverado Sierra 1500 LM2 LZ0 3.0L Duramax Engine Timing Chain OEM GM 55515943

This Genuine GM 55515943 timing chain is the updated design, compatible with all LM2 and LZ0 engines and a must-have upgrade for 2020 models prone to failure.

The 3.0L Duramax, introduced in 2020, is a strong performer — but early engines came with a critical flaw: an under-lubricated timing chain that wore out prematurely. Many 2020 owners experienced excessive chain slack, throwing off engine timing and causing major repairs upwards of $10,000.

GM listened. By early 2021, a new updated timing chain design was introduced.

What's Different About This Chain?
Oil Flow Holes – Between each link to improve lubrication
Updated Link Pins – For longer life and higher durability
Improved Lubrication – Reduces heat buildup at the rear of the engine
Backed by GM – Factory-tested and approved replacement chain

What’s Included:
(1) Genuine GM Timing Chain – Part #55515943
Factory-sealed GM packaging

Specs:
OEM GM Part #: 55515943
Replaces Older Part #: 55489217
UPC: 193468720655
Condition: Brand New, Updated OEM Design
Material: Hardened Steel
Position: Rear of engine (timing side)
Warranty: 1-Year Manufacturer Warranty

Fitment:
2020–2025 Chevrolet Silverado 1500 3.0L LM2 / LZ0 Duramax Diesel
2020–2025 GMC Sierra 1500 3.0L LM2 / LZ0 Duramax Diesel
2021-2024 GM SUV's 3.0L LM2 Duramax Diesel