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2018 Ram 1500 Hemi - Transmission Shudder & Fluid Change Interval

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Tom H. · rep 0 · May 22, 3:36 AM · 1 replies · solved · Question

Vehicle: 2018 Ram 1500 Laramie

My 2018 Ram 1500 Laramie with the 5.7L Hemi and 8HP70 transmission has developed a slight shudder, especially noticeable between 30-45 mph under light acceleration. It's got about 75,000 miles on it now. I'm wondering if it's time for a transmission fluid and filter change.

I've heard different things about the service interval for these transmissions. Some say "lifetime fluid," others recommend changing it around 60k-80k miles. What's the consensus here? Is this shudder a common symptom of old fluid, or could it be something more serious?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:36 AM

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ClearTheCode admin answer:

A shudder in your 2018 Ram 1500's 8HP70 transmission at 75,000 miles is a common concern, and old fluid can certainly be a contributing factor. While some manufacturers label transmission fluid as 'lifetime,' for optimal longevity and performance, especially under towing or heavy use, a fluid and filter change around 60,000 to 80,000 miles is generally recommended.

Here's what you should consider:

  1. Fluid & Filter Change: This is often the first step. Over time, transmission fluid degrades and loses its lubricating properties, and the filter can become clogged. Fresh fluid can resolve minor shudders caused by fluid breakdown.
  2. ZF 8HP70 Specifics: The ZF 8HP70 transmission is robust, but it's sensitive to fluid quality. Ensure that if you perform a DIY change, you use the correct ZF LifeguardFluid 8 or an equivalent fluid that meets the ZF TE-ML 11 specification. Using the wrong fluid can cause more problems.
  3. Common Causes of Shudder:
    • Degraded Transmission Fluid: As mentioned, this is a primary suspect.
    • Torque Converter Issues: A failing torque converter can cause shudders, especially under light load. This is a more involved repair.
    • Transmission Solenoids: Sticking or failing solenoids can lead to erratic shifting and shudders.
    • Engine Misfires: Sometimes, an engine misfire can feel like a transmission shudder. Check for any stored engine codes (P030x).

When to See a Shop:

  • If the shudder persists or worsens after a fluid and filter change.
  • If you notice any other symptoms like delayed engagement, harsh shifts, or warning lights on the dash.
  • If you're uncomfortable with the complexity of a ZF 8HP70 transmission fluid change, as it often requires specific temperature monitoring and fill procedures. A professional shop with experience in these transmissions can properly diagnose and service it.
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