Metal front and rear differential kit

Parts & installation

Manufacturer documented

One sold kit; see the route for assembly coverage

Part	Qty
ARA210007ARRMA Front & Rear Metal Differential Upgrade Set: BOOST BOX	1

Requires ARA210003: ARRMA 4X2 to 4X4 Transmission Conversion Upgrade Set: BOOST BOX.
Required only if the BOOST is still rear-wheel drive. The two-axle metal-differential route assumes the separate 4WD conversion is already fitted; do not buy that conversion twice.

ARRMA documents this option for this edition. Check the installed parts before ordering.

Use this kit when replacing worn axle differentials or preparing a supported drivetrain build. One package supplies two assembled metal-gear differentials, two yokes and installation hardware.
The two assemblies cover front and rear, not the center differential. Use the matched kit rather than assuming individual ring gears fit an unrelated housing.
This front-and-rear route is for a BOOST already converted to 4WD. A factory 2WD BOOST does not have two driven axle differentials. Fit the correct short center shaft for Granite/Vorteks or long shaft for Senton.
Check input-gear engagement, shimming and free rotation during installation. Follow the package instructions and reuse only serviceable compatible mounting parts.
Sharing components with 4S models does not change the motor, ESC or battery rating. Keep the electrical system within its existing limits.
Complete-module alternatives use two sold modules, one per axle, with matched input/ring gears and yokes. ARA311156 is the current steel-gear module; legacy ARA311072 is explicitly CNC steel and discontinued. Do not infer that the successor is CNC machined.

Maker instructions and assembly diagrams for the stated parts and configuration.