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Easy Ford C-Max 4″ to 8″ Sync 3 Upgrade Harness

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NaviUpgrade’s Ford Transit Connect 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!

$229.00

4" to 8" Sync to Sync 2/3 Base Upgrade Harness
1 × 4" to 8" Sync to Sync 2/3 Base Upgrade Harness

Out of stock

$229.00

Out of stock

The NaviUpgrade Ford C-Max 4″ to Sync 3 Upgrade harness is perfect for the DIY-er who is looking to add Sync 3 to his or her vehicle!

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
Model Year

2011-2020

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Easy Ford C-Max 4" to 8" Sync 3 Upgrade Harness

Update – May 15th, 2025

Hi everyone,

Good news — the NaviUpgrade 4″ to 8″ Sync 2 and Sync 3 harnesses will be coming back in stock.

After the initial announcement of a 145% tariff on Chinese imports by President Trump, I had to pause production due to the immense impact on cost. However, with the tariff now reduced to 30%, I’ve decided to move forward with a new production order through my vetted overseas factory. Estimated in-stock date will likely be early July.

There will be a small price adjustment. The new price for the harnesses will be $249, which brings it in line with U.S.-based competitors I previously undercut at $229. That said, I’m still committed to offering free programming files, customizations for edge cases, and of course, instructional videos with top-tier customer support.

Thank you for your patience and continued support — I’m excited to make these available again soon.

– Brian
Founder, NaviUpgrade

Originally posted: April 13th, 2025
Updated: May 15th, 2025