Core Parameters​ U-Joint Series: 1350 Heavy-Duty Standard Spline System: 31 Based on 32 | Major Diameter 1.378" (35mm) Joint Dimensions: Bearing Diameter: 1.188" (30.15mm) Overall Width: 3.875" (98.4mm) Centerline-to-Spline Length: 5.5" (140mm) Hub Specification: Ground Diameter: 1.885" (47.9mm) ±0.002" Tolerance Class: JIS Grade 12 Performance Advantages​ √ Dual-row roller bearing construction increases load capacity by 40% √ Dynamic balance for stable operation up to 3,500 RPM Compatibility Guide​ ※ Fits GM transmissions including TH400, 4L80E, and Turbo Hydromatic 400 ※ Designed for Muncie M20/M21 manual transmissions ※ Recommended for Borg Warner Super T10 applications ※ Requires matching 1350 series drive shaft components Quality Assurance​ √ 18-month warranty on critical components √ 100% hydrostatic pressure testing **Disclaimer Notice:**​ Specific vehicle compatibility requires professional verification. This aftermarket component is not manufactured or endorsed by original equipment manufacturers. （All dimensions include ±0.02" manufacturing tolerance. Critical surfaces achieve HRC58-62 hardness through heat treatment.）