Nissan engines for the Hardbody, Pathfinder, Frontier, Titan, Paladin, and YES the Xterra. Nissan VG Engines: VG30i - 3.0L 1986-1989 Hardbody Truck 1986-1989 Pathfinder VG30E - 3.0L 1990–1995 Hardbody Truck 1990–1995 Pathfinder VG33E - 3.3 L 1996–2000 Pathfinder 1999–2004 Frontier 2000–2004 Xterra 200?–200? Paladin VG33ER - 3.3 L 2001–2004 Frontier SC 2002–2004 Xterra SC Nissan VQ Engines: VQ35 - 3.5 L 2001–2004 Pathfinder (240hp /265 rpm) VQ40DE - 4.0 L 2005–present Frontier (261 hp @5600 rpm; 281 ftÂ·lbf (381 NÂ·m) @4000 rpm) 2005–present Xterra (261 hp @5600 rpm; 281 ftÂ·lbf (381 NÂ·m) @4000 rpm) 2005–present Pathfinder (270 hp @5600 rpm; 291 ftÂ·lbf (395 NÂ·m) @4000 rpm) Misc: WD21 1987-1995 Pathfinder WD22 2000-2004 Xterra N50 2005-present Xterra R50 1996-2004 Pathfinder R51 2005-up Pathfinder D21 1986-1997 Hardbody D22 1998-up Frontier H233B Hitachi 233 B large 3rd member type axle found in most V6 and a few 4 banger 4x4's, Desert Runners, and 2wd Pathy's and 2wd Xterra V6's. R200A V6 Pathfinder front differential Hardbody and Frontier -- R200A and C200 Gears ARE INTERCHANGEABLE. Yes, the same part numbers are used for the same ratios in the Nismo catalog for both diffs. M226 2005-present Xterra Dana 44 variant rear differential TD27T (Turbo charged) 1991 Nissan 2.7l diesel engine VK56 2004-2009 Titan VK56DERRTT VK series 5.6L DOHC direct injection SC'd, oversized twin turbos Cars and vans were purposely omitted.