The house around the diff. The rear gearbox case leads a hard life on a 6S truck — it's the structure the wing mount hangs off, the anchor for the roll bar, and the crash structure behind every rear-first landing, which is why stripped threads and cracked cases eventually visit most hard-driven Kratons. This genuine Arrma HD set replaces the complete housing: main gearbox case, gearbox cover, the rear brace/wing mount holder and the anti-roll bar retainer — the full composite structure, so a tired case rebuilds properly rather than piecemeal.

Fitment

Fits the Arrma Kraton 6S BLX and Notorious 6S BLX — the current V6-generation part, listed by Arrma in these platforms' standard parts. Working from an older manual or an earlier 6S truck? This case set is cross-referenced against the previous AR310854 / ARAC5006 HD 6S case numbers — confirm against your vehicle's exploded view on Arrma's site before ordering, as gearbox revisions differ across the 6S generations. While the case is open: it's the natural moment to service the diff and check the input bearings, and fresh case screws thread best into fresh composite.

Specifications

Brand: Arrma
SKU: ARA-1520
Product: HD gearbox case set — complete housing
Contents: Main case, cover, rear brace/wing mount holder, anti-roll bar retainer
Fits: Kraton 6S BLX, Notorious 6S BLX (V6 generation)
Cross-Reference: Earlier numbers AR310854 / ARAC5006 — verify via exploded view
Material: Tough composite, HD specification