Hong Nor Ft/Rr Torsen Diff for X1-CR 7.7 777 Sacker Hyper 7 RC Differential - X1S-31

The Hong Nor X1S-31 is a Torsen-style front and rear differential designed as a direct-fit replacement for the Hong Nor X1-CR, 7.7, 777, Sacker, and Hyper 7 RC car platforms. Unlike standard ball differentials, a Torsen diff distributes torque mechanically based on wheel resistance, offering more consistent and predictable power delivery across varying surfaces. If your existing diff is worn, damaged, or you simply need a like-for-like spare to keep your rig running, the X1S-31 is the correct part for these Hong Nor models.

Key Features

• Torsen-type differential provides mechanical torque distribution without relying on fluid or friction discs
• Designed to fit both front and rear differential positions on compatible Hong Nor platforms
• Direct replacement part — matches the original specification of the X1-CR, 7.7, 777, Sacker, and Hyper 7
• Suitable for restoring a worn or failed diff back to factory operating condition
• Part number X1S-31 for straightforward identification when ordering

Compatible With

• Hong Nor X1-CR
• Hong Nor 7.7
• Hong Nor 777
• Hong Nor Sacker
• Hyper 7

What's Included

• 1x Hong Nor X1S-31 Torsen Differential unit

What You Need

• Appropriate tools for differential removal and installation on your Hong Nor model
• Differential oil or grease if required during reassembly (check your model's manual for specification)