Dodge Viper, ZB (USA / CAN)

Additional Notes

• The Dodge Viper ZB rear limited slip differential carries three distinct total fluid capacities across the covered model years: 1.35 liters for the Phase I 2003-2004 configuration, 1.70 liters for the Phase I 2004-2007 configuration, and 1.30 liters for the Phase II 2008-2010 configuration.
• The Phase I ZB 2003-2004 rear differential specifies a separate limited slip additive quantity of 0.10 liter, which is added alongside the 1.35-liter total fill. The LS additive is a friction modifier required by limited slip differentials to control clutch pack behavior and prevent chatter.
• The Phase I ZB 2004-2007 rear differential carries a slightly larger LS additive requirement of 0.12 liter, paired with the higher 1.70-liter total capacity. The increase in both values relative to the 2003-2004 Phase I specification reflects a physically larger differential unit.
• The Phase II ZB 2008-2010 rear differential specification lists only a total capacity of 1.30 liters, with no separate LS additive quantity stated alongside it, unlike both Phase I configurations.
• Across all three configurations, the normal-use service interval is 18,000 miles or 18 months, whichever comes first. The dual-trigger format means a time-based threshold applies even when mileage accumulation is low.
• Under severe use conditions, all three configurations share a shortened change interval of 12,000 miles, with no accompanying time-based threshold stated. The absence of a time component in the severe-use rows contrasts with the dual-trigger format applied under normal use.
• The 6,000-mile reduction between the normal and severe service intervals applies uniformly across the Phase I 2003-2004, Phase I 2004-2007, and Phase II 2008-2010 configurations, despite the differences in their respective fluid capacities.