Pancar Compatible Geardiff Upper Case - Arrowmax AM-931008 AM  [AM-931008]

Upper case function and fit

The Arrowmax AM-931008 AM Pancar Geardiff Case Upper serves as a replacement upper housing for Pancar-style geardiff assemblies in 1/12 and 1/10 scale models. The text explains expected fit, refitting advice, and the role the upper shell plays in diff servicing and handling.

Use and fit: designed for Pancar geardiff sets and F1-type arrangements in the 1/12 and 1/10 classes. Before finalising the build verify that the upper case aligns with your lower case, internal gears and bearings so that gear mesh and preload are preserved.

Installation notes: take the diff from the chassis, drain lubricant and open the old case carefully to avoid losing shims or gear orientation. On reassembly ensure bearing seats are clean, confirm gear backlash, and progressively torque fasteners while checking free rotation to spot any misalignment.

Tuning role: the upper case defines the location of gears and bearings, so its accuracy affects mesh, preload and ultimately diff behaviour under acceleration and cornering. Installing a correct upper housing returns geometry to spec and helps maintain predictable diff action for setup work.