What size U-joints do I need?
Documented on the 1965 Ford Mustang build
Published June 14, 2026
You need U-joints that match the yoke dimensions used on the modified shaft and the vehicle's companion flange.
Full Answer
You need U-joints that match the yoke dimensions used on the modified shaft and the vehicle's companion flange. The video recommends measuring the yoke width and bearing cap diameter and sourcing the correct U-joint size (commonly 1310 or 1350 sizes on classic Fords), but verify before purchase.
Documented In This Build
Related Knowledge
Can I use an F100 driveshaft in my '65 Mustang?How do I determine the correct driveshaft length?Is welding on the driveshaft safe?What torque should I use on the driveshaft flange bolts?What safety steps should I take before starting?How should I protect and organize the new wiring?Can I keep the original radio and still add Bluetooth?What does 'throwing curveballs' mean for the project?
Related Parts
Donor driveshaft (1981 F100)
$75
Universal joints (U-joints) - set
$40
Weld-on driveshaft flange / yoke
$60
Welding rod / filler metal
$10
Paint / rust inhibitor
$15
Wheel/store balancing service
$60
Hardware (bolts, retaining clips, grease)
$15
Related Tools
Torque wrench
Jack stands and floor jack
Angle grinder with cutoff wheel
MIG/ARC welder
Metal chop saw or band saw
Lathe (optional) / tube facing tool
Tape measure and calipers
Bench vise and C-clamp / U-joint press
