4″ to 8″ Sync to Sync 2/3 Base Upgrade Harness

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NaviUpgrade’s Ford Base Sync 3 Upgrade Harness is designed to make upgrading your base model Transit Connect to have Sync 3 an absolute breeze. Plug & Play, your install can be finished in as little as 45 minutes!


In stock (can be backordered)


Our ‘base’ 4″ to 8″ is a harness is the base of a modular harness system that can be used on many vehicle when paired with our other harnesses, sold as combinations on our site. By itself, this harness can be used to upgrade a number of vehicles, like the C-MAX, Kuga, Escape, B-MAX, Fiesta, Transit, Transit Connect, and more.

We also offer FREE programming files with your purchase, something no other online store does. This allows you to get up and running quickly using an OBDII dongle, without messing around with a bunch of settings or hex codes in FORScan.

Please feel free to check out our Guides tab for more information on what other hardware you’ll need to complete your upgrade.

We pride ourselves in providing the most value out of any online store when it comes to Sync 3 Upgrades. NaviUpgrade is constantly working on building out resources for our customers and fans to use on their own vehicles. Our goal is to empower all vehicle owners to feel comfortable upgrading their own vehicles.


Weight9 oz

  1. Michael (verified owner)

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  3. Shawn Raft (verified owner)

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  5. Sean Stage (verified owner)

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  6. David G. (verified owner)

    Excellent quality. Exceeded expectations because leads were labelled, greatly easing the installation!

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  7. Guy Hahn (verified owner)

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