TT-02B rear ball differential

Installation notes

• Use one complete 22046 pack for one rear axle. It supplies 39T ring gear and matched 15T bevel pinion, ball/thrust hardware, two joint cups, two 850 and two 1280 bearings, axle rings/pins and ball-diff grease. Replace the rear differential, not the center drive.
• Match the number on the 15T bevel pinion to the ring gear: 39 with 39. If the rear previously used the optional 40T gear, remove that matched pinion as well. Preserve front/rear ratio intent; an unequal 39/40 setup is a separate tuning choice.
• Apply ball-diff grease to the rings and balls, compress the spring once before fitting and use separately available molybdenum grease on the thrust assembly. Tighten while holding the long joint until the ring rotates with slight resistance, then check that the ring does not slip with both joints held.
• Insert universal swing shafts into the narrow openings of the supplied cups. Fit the 2x9.8 pins and seat axle rings in their grooves. The installed differential faces the same direction as the original; increased adjustment range also adds maintenance.
• Replace the joint cups supplied in 22046 with one 22063 pair. Its pack includes two steel gearbox joints, two needle pins and two axle rings; its complete instruction sheet shows these replacing the ball-diff cups.
• Standard TT-02B additionally needs one 53791 universal pair. The original pack image verifies two complete 70 mm assemblies, axles, joints, pins, grub screws and grease. Retain the rear gearbox housing, uprights and suspension.
• Do not transfer the standard TT-02 37 mm shaft route to this longer-arm buggy. The Type-S, MS and other unlisted edition scope is not inferred from common family names.

Sources