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2018 F-150 10R80 Transmission Shudder - Fluid Change Needed?

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Chris P. · rep 0 · May 22, 2:28 AM · 1 replies · solved · Question

Vehicle: 2018 Ford F-150 Lariat

Hey everyone, I've got a 2018 Ford F-150 Lariat with the 3.5L EcoBoost and the 10-speed automatic transmission (10R80). It's got about 85,000 miles on it now.

Lately, I've been noticing a slight shudder, especially when accelerating gently between 30-50 mph, and sometimes during light throttle shifts. It feels like a vibration through the floor and seat, not super aggressive but definitely noticeable. It's not consistent, but it's happening more often.

I've read online that the 10R80 can have issues with the transmission fluid, and a fluid change might help. Is this something I should tackle myself, or is it best left to a shop? What kind of fluid does it take, and is there a specific procedure for these transmissions? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:28 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common issue with the 10R80 transmission in your 2018 F-150, often referred to as a 'shudder' or 'vibration.' This is frequently related to the transmission fluid and torque converter.

Here's what you should know and consider:

  1. Fluid Type is Critical: The 10R80 transmission requires Motorcraft MERCON ULV (Ultra Low Viscosity) automatic transmission fluid. Using any other type of fluid can cause further issues or worsen the problem. This is not a standard MERCON LV fluid.
  2. Fluid Change Procedure: A simple drain and fill might not be sufficient. Many owners and technicians recommend a full fluid exchange (flush) to replace as much of the old fluid as possible. This often involves using specialized equipment to cycle new fluid through the system.
  3. Technical Service Bulletins (TSBs): Ford has released TSBs (e.g., TSB 21-2315, TSB 22-2079) addressing 10R80 shudder issues, often recommending a fluid exchange with the updated MERCON ULV fluid and sometimes a Powertrain Control Module (PCM) reflash to update the transmission's adaptive learning.
  4. DIY vs. Shop: While a drain and fill can be done by an experienced DIYer, a full fluid exchange is typically best performed by a shop with the correct equipment. The PCM reflash also requires dealership-level tools. Given the specific fluid and potential software update, a professional diagnosis and service are often recommended.
  5. Potential Causes: The shudder is often attributed to moisture absorption in the original fluid, leading to friction material degradation in the torque converter clutch. The updated ULV fluid is designed to mitigate this.
  6. When to See a Shop: If the shudder is severe, accompanied by hard shifts, delayed engagement, or if your check engine light comes on (potentially with codes like P0741 for Torque Converter Clutch Stuck Off), it's crucial to see a qualified Ford technician immediately. They can perform a diagnostic scan, check for relevant TSBs, and ensure the correct fluid and software updates are applied.
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