2990-1839B – CV Double Joints Heads – 29×52 ISR 1510 SER’ – Blank Flange for Toyota 1.810M Pilot DKTHB | 1.142 x 2.047

The 2990-1839B CV double joint head is the flange-side assembly for constant velocity driveshafts operating at steep angles — SAS builds, long travel suspensions, transfer case drop kits. It provides the ball socket centering mechanism that prevents velocity variation through the joint's full operating range. The 2990-1839B CV double joint head requires exact pilot diameter and bolt circle to seat correctly on the axle or diff flange.

2990-1839B Cv Double Joint Head — Series: 1510. Bolt Circle & Pilot Specs

Series: 1510. The 2990-1839B CV double joint head specs: Blank bolt circle | 1.808 pilot | 2.440" butt dia | 5.75" end-to-weld. Toyota 1510 SERIES. Pilot diameter is critical for the centering ball mechanism — a loose pilot allows the CV head to walk off-center at high angles, which defeats the entire purpose of the CV design. End-to-weld factors into compressed driveshaft length calculations.

Before ordering the 2990-1839B CV double joint head, measure your existing flange bolt circle and pilot in millimeters or decimal inches. European and Toyota flanges vary by year and application — spec sheet data isn't always reliable on swapped or modified vehicles. Measure the actual flange.

Key Features

• Series: 1510
• Bolt circle: Blank — must match flange bolt pattern exactly
• Pilot dia: 1.808 — centers CV head on flange, critical for CV function
• Butt dia: 2.440" — driveshaft tube connection point
• End-to-weld: 5.75" — factors into compressed shaft length
• Tube fit: 2.560 x 0.067
• CV double joint design — eliminates velocity variation at steep operating angles
• Note: Toyota 1510 SERIES

Specifications

• SKU: 2990-1839B
• Brand: UDS
• Series: 1510
• Bolt Circle: Blank
• Pilot Dia: 1.808
• Butt Dia: 2.440"
• End to Weld: 5.75"
• Tube Fit: 2.560 x 0.067
• Notes: Toyota 1510 SERIES