Pancar Geardiff Upper Housing Upgrade - Arrowmax AM-931008 AM  [AM-931008]

Upper housing notes

The Arrowmax AM-931008 AM Pancar Geardiff Case Upper is offered as a replacement upper housing for Pancar-style geardiff units in 1/12 and 1/10 scale models. The copy covers expected fit, installation pointers, and how the upper housing affects serviceability and diff performance.

Use and fit: intended to work with Pancar geardiff sets and F1-inspired assemblies across the 1/12 and 1/10 categories. When replacing the top shell check alignment with your existing lower case, the internal gear train and bearings to keep mesh and preload correct.

Installation notes: remove the differential from the chassis, drain the fluid and disassemble carefully to keep shims and gear orientation intact. During reassembly clean bearing seats, verify gear backlash, and tighten mounting screws stepwise while confirming the diff spins freely under simulated load.

Tuning role: the upper housing secures gears and bearings so its tolerances influence mesh, bearing preload and how the diff responds during acceleration and cornering. Replacing a damaged upper shell restores the original geometry and helps preserve predictable diff characteristics for setup tuning.