N2-83-599X – Cv Flange Yoke – Ball Stud Dia 0.5″ – Bolt Circle Dia 3″ – Bolt Hole Dia 0.370 TH

N2-83-599X Neapco 1310 Series CV Flange Yoke — GM Auto-Trac

The N2-83-599X is a Neapco 1310 series CV flange yoke designed as the GM Auto-Trac transfer case CV flange, mating with the N2-81-1181 stub shaft. It features a 3.0" bolt circle diameter with a 2.0" pilot diameter (type F), a 0.5" ball stud diameter, and threaded bolt holes. The CL-to-face dimension is 1.625". Lube port: none.

Specifications

• Part Number: N2-83-599X
• Brand: NEAPCO
• Series: 1310
• Class: LD
• Bolt Circle Diameter: 3.0"
• Pilot Diameter: 2.0" (Type F)
• Ball Stud Diameter: 0.5"
• Bolt Hole Diameter: 0.370 TH (threaded)
• CL to Face: 1.625"
• Lube: No
• Notes: CV flange for GM Auto-Trac; mates with N2-81-1181 stub shaft. Threaded holes.

When fitting the N2-83-599X, verify the GM Auto-Trac transfer case output bolt circle is 3.0" and the pilot bore is 2.0". This flange uses threaded (0.370 TH) bolt holes rather than clearance holes — the mounting hardware threads into the flange body. Confirm mating hardware thread specification before assembly. The companion stub shaft is the Neapco N2-81-1181.

The GM Auto-Trac transfer case is found in several General Motors full-size truck and SUV platforms. The N2-83-599X replaces the OEM CV flange at the transfer case output. The 3.0" bolt circle is specific to this GM application and is smaller than the 3.5" bolt circle used on the standard P211229X (also 1310 series) — do not interchange.

Confirm the mating stub shaft is the N2-81-1181 before ordering the N2-83-599X. The threaded hole specification (0.370 TH) means the flange bolts thread directly into the yoke — verify this against the hardware on your transfer case output. The 2.0" pilot and 3.0" bolt circle are the primary fitment specs.