T700 Main Gear Case for ALIGN T-Rex 550/600 Electric Series Helicopters

Product has been archived, and is no longer available for purchase. This page is for reference only.



The T700 Main Gear Case for the ALIGN T-Rex 550E/600E/600ESP electric series uses the stock ALIGN T-Rex 700 Main Gear (HN7019-1, must be purchased separately), which gives tremendous benefits to the 550/600 designs including: increased headspeed (164T versus 170T), increased gear teeth engagement, and significantly increased strength due to the taller gear and higher contact surfaces. This upgrade is a MUST HAVE for high-power, high-voltage setups to prevent stripping of the main gear during flight and hard 3D maneuvers. Please review the Installation Diagram (PDF) for critical information on proper press-fit installation and positioning of the one-way clutch bearing for optimal gear alignment.

The T700 Main Gear Case can be used in conjunction with the new KDE Direct T-Rex 550/600/700 Series Main Drive Gear, 115T, MOD1.0 or the KDE Direct T-Rex 550/600/700 Series Main Drive Gear, 164T, MOD0.7 (must be purchased separately) for significantly increased strength advantages, reduced noise/wear, and alternate gearing ratios. In addition, the new High-Performance One-Way Drawn Cup Clutch Bearing (HF1216) is also available for a strong, bind-free transmission of the power to the main shaft.

SAVE $0.95 when you purchase the Main Gear Case with the HF1216 Bearing.

Important Notice: The AT550/600-MGC design is compatible with the following ALIGN components (MOD0.7 Tail Gearing):

  • Bearing Shaft: H60139, TREX600 One-Way Bearing Shaft
  • Autorotation Gear: H60020, TREX600 M0.7 Autorotation Tail Drive Gear
  • Torque Tube Gear: H60121, TREX600 M0.7 Torque Tube Front Drive Gear
  • Belt Drive Gear: H60078, TREX600 Metal Tail Drive Gear Assembly


Material: Aluminum 6061-T6

Models: All ALIGN T-Rex 550 (V1) and 600 (E/CF/GF/ESP) series (replaces stock ALIGN part #HN6064).


  • One (1) T-Rex 550/600 Series Aluminum T700 Main Gear Case
  • Six (6) M3 x 0.5 x 6 mm Button Head Socket Head Cap Screws (Class 12.9)

Finish: Clear anodize, mirror-polish CNC gloss

Weight: 15 g (design is FEA optimized for maximum strength and minimum weight)


We Also Recommend