Standard Harness Length, Includes fuse/relay box and plugs for necessary operation in an LS swap
GM LT L86/L83 Engine And Standard Transmission Wiring Harness Speedway Motors
GM LT L86/L83 Engine And Standard Transmission Wiring Harness
Sku # 28912200-MANUAL
Mfr. Part # 28912200-MANUAL
Condition
New
Brand
Speedway Motors
Sold
Each
Details

An LT engine swap is a no-brainer when it comes to adding some affordable horsepower to a project car, but any swap comes with its share of headaches, including wiring. That's where the engine and transmission wiring harness comes in. It is designed for 2014 and later L86 and L83 LT engines.

  • Drive-by-Wire Throttle
  • Standard Harness Length
  • Includes fuse/relay box and plugs for necessary operation in an LS swap
Specs
MFG. Part #
28912200-MANUAL
Sold in Quantity
Each
Reviews

Nice wiring harness

Rated
Product Rating
by Smdgene on April 07, 2026

Summary: Appears to be high quality. It's not installed yet but I'm looking forward to getting it on line.

Yes, I recommend this product.

Tech Support
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.