GMC Sonoma, GMT325 (USA / CAN)

Transfer case fluid capacity & service interval

GMC Sonoma, GMT325 (USA / CAN) requires transfer case fluid with a capacity of 1 liter. Service intervals include checks at 3000 miles and 7500 miles, and fluid changes at 15000 miles. The data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Sonoma 4.3 4WD (2004-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 7500 miles
Sonoma 4.3 4WD (2004-2004)
  • Use: Severe
  • Capacity 1 liter
  • Check 3000 miles
  • Change 15000 miles
Sonoma 4.3 4WD (1996-1999)
  • Use: Normal
  • Capacity 1 liter
  • Check 7500 miles

Additional Notes

  • The GMC Sonoma GMT325 4.3 4WD transfer case holds 1 liter of fluid across all listed configurations, a figure consistent with a service fill rather than a full overhaul capacity.
  • For the 4.3 4WD in model years 1996-1999, the transfer case fluid check interval under normal use is set at 7,500 miles, with no separate change interval listed for that condition.
  • The 2004 4.3 4WD carries two distinct service schedules depending on operating conditions, with normal use calling for a fluid check at 7,500 miles and severe use reducing that check interval to 3,000 miles.
  • Under severe use for the 2004 4.3 4WD, a dedicated fluid change interval of 15,000 miles is specified, a figure that does not appear in the normal-use row for the same engine and drivetrain.
  • The 1996-1999 and 2004 4.3 4WD configurations share an identical 1-liter capacity and a 7,500-mile check interval under normal use, indicating no change in those particular specifications across that span of model years.

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