The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Ram 1500 Hemi Transmission Fluid & Filter Change Interval?

0

Mike T. · rep 0 · May 24, 1:28 PM · 1 replies · solved · Question

Vehicle: 2018 Ram 1500 Big Horn 5.7L Hemi

Hey everyone,

I've got a 2018 Ram 1500 Big Horn with the 5.7L Hemi and the 8-speed automatic transmission. I'm coming up on 70,000 miles and I'm starting to think about transmission maintenance. I do a fair bit of towing with my travel trailer, probably a few times a month during the warmer seasons.

I've heard conflicting advice on when to change the transmission fluid and filter. Some say it's a 'lifetime' fluid, others say 60k, some say 100k. What's the general consensus for a truck like mine, especially with the towing? Also, is this something a reasonably handy DIYer can tackle, or is it best left to the dealership or a specialized shop? I've done oil changes and differential fluid before, but transmissions feel a bit more intimidating.

Any advice or experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:28 PM

0

ClearTheCode admin answer: Understanding the correct transmission fluid and filter change interval for your 2018 Ram 1500 with the 5.7L Hemi and 8-speed ZF transmission is crucial for longevity, especially with towing.

  1. Recommended Intervals:

    • Normal Duty: For most driving conditions without heavy towing or extreme temperatures, Ram generally recommends inspecting the transmission fluid at 60,000 miles and changing it at 120,000 miles.
    • Severe Duty: If you frequently tow heavy loads, drive in mountainous terrain, or experience extensive stop-and-go traffic, it's highly recommended to perform the service much sooner, typically between 60,000 and 80,000 miles. Considering you do some towing, aiming for the lower end of this range (around 70,000 miles) is a wise decision for your truck.

  2. Fluid and Filter Type:

    • Your 2018 Ram 1500 with the 8-speed ZF 8HP70 transmission requires a very specific fluid, typically ZF Lifeguard 8 fluid or an approved equivalent (e.g., Mopar 8&9 Speed ATF). Using the wrong fluid can cause severe and costly damage to the transmission.
    • The transmission filter for this ZF unit is often integrated into the transmission pan itself. This means replacing the filter requires replacing the entire pan assembly.

  3. DIY vs. Professional Service:

    • Changing the fluid and filter (pan) on a ZF 8HP transmission can be a complex DIY job. It involves:
      • Draining the old fluid.
      • Removing the transmission pan/filter assembly.
      • Installing a new pan/filter with a new gasket.
      • Refilling with the correct, expensive fluid.
      • Crucially, performing a precise fluid level check at a specific transmission temperature using a diagnostic tool (like an OBD scanner with live data capability) to monitor the transmission temperature. This "hot fill" procedure is critical to avoid over or under-filling, which can lead to shifting issues or damage.
    • When to See a Shop: If you're not comfortable with precise temperature monitoring, working with expensive specialized fluid, or don't have the necessary tools (like a diagnostic scanner for temperature), it's highly recommended to have a qualified mechanic or dealership perform this service. Improper fluid levels or types can lead to premature transmission failure.

There are no specific OBD codes directly associated with routine transmission fluid changes, but if the fluid level is incorrect after a service, you might eventually see codes related to transmission performance or slipping (e.g., P0700 - Transmission Control System Malfunction, or specific gear ratio errors).

Menu

Help & account