Take a look at the HiTec HS-322 more torque than the futaba 3004 also has the karbonite gear train.

HS-322HD deluxe servo with preinstalled round servo horn

Four (4) each: brass eyelets, rubber grommets, servo mount screws

Three (3) Additional Horns: 2-arm, 4-arm, adjustable 1 arm

Specifications:copyright (c) 2004 by TTi, Inc. All Rights Reserved

Speed: copyright (c) 2004 by TTi, Inc. All Rights Reserved

0.19 sec/60 degrees at 4.8V

0.15 sec/60 degrees at 6.0V

Torque: copyright (c) 2004 by TTi, Inc. All Rights Reserved

42 ounces-inches (3.0kg-cm) at 4.8V

51 ounces-inches (3.7kg-cm) at 6.0V

Size: LxWxH (1.6x0.8x1.4) inches (41x20x37)mm

Weight: 1.50 ounce (43 grams)

Universal Connector: Futaba, Hitec, JR, Airtronics Z with approx. 12" wire.copyright (c) 2004 by TTi, Inc. All Rights Reserved
An ultra strong, high impact, composite material that is at the heart of Hitec's revolutionary new geartrain. The new KARBONITE composite gear train has eliminated lash and slop forever. They are less likely to strip under the shock and loads that would usually break standard gears.

Found in all the "HD" (Heavy-Duty) and "HB" (Heavy-Duty Ball Bearing) servos. "Karbonite" gears are four times stronger than standard nylons gears and offer virtually ZERO wear even after 250,000 when tested! The result, you get better control with Hitec�s new KARBONITE gear technology.