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2018 Pacifica Transmission Fluid Change Interval and Shuddering

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Sarah K. · rep 0 · May 25, 4:25 AM · 1 replies · solved · Question

Vehicle: 2018 Chrysler Pacifica Touring L

Hey everyone,

I have a 2018 Chrysler Pacifica Touring L with about 75,000 miles on it. Lately, I've noticed a slight shuddering, especially when accelerating from a stop or at lower speeds. It's not constant, but definitely noticeable. I'm wondering if it's time to change the transmission fluid.

I've heard different things about service intervals for these transmissions. Some say it's 'lifetime' fluid, others recommend changing it around 60k. What's the consensus for the ZF 9-speed in the Pacifica? Is this shuddering a common symptom of old fluid?

Any advice on DIY or what to look for if I take it to a shop would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:25 AM

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Hi Sarah,

That shuddering sensation you're describing in your 2018 Chrysler Pacifica Touring L could definitely be related to your transmission fluid, especially with 75,000 miles on the odometer. While some manufacturers label transmission fluid as 'lifetime,' it's generally understood in the automotive community that 'lifetime' often refers to the expected lifespan of the first owner, not the vehicle itself. For the ZF 9HP 9-speed automatic transmission in your Pacifica, many experts and independent shops recommend a fluid and filter service between 60,000 and 80,000 miles, especially under conditions like stop-and-go driving, towing, or hot climates.

Here's what you should consider:

  1. Fluid Type: It's crucial to use the correct Mopar ZF 8&9 Speed Automatic Transmission Fluid (part number 68157995AB or equivalent). Using the wrong fluid can cause significant transmission issues.
  2. Filter Replacement: The ZF 9HP transmission has an internal filter that should be replaced during a fluid service. This usually requires dropping the transmission pan.
  3. DIY vs. Shop: A transmission fluid and filter change on these units can be a bit more involved than a simple drain and fill. It often requires specific tools for proper fluid level checking (which is temperature-dependent) and ensuring all air is purged from the system. If you're not comfortable with this, a reputable shop specializing in transmissions or a Chrysler dealership would be your best bet.

Common Causes of Shuddering:

  • Degraded Transmission Fluid: Fluid loses its lubricating and cooling properties over time, leading to increased friction and shuddering.
  • Worn Torque Converter: Less common at your mileage but possible.
  • Engine Misfires: Though less likely to feel like a transmission shudder, it's worth ruling out.

When to See a Shop:

  • If the shuddering worsens or becomes more frequent.
  • If you notice any warning lights on your dashboard.
  • If you're not confident performing the service yourself due to the complexity of the ZF 9HP.
  • If, after a fluid change, the shuddering persists, as it could indicate a more serious internal transmission issue.
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