ARA311031 Differential input gear
ARRMA HD Input Gear 13T
Compatible with: ARRMA Big Rock 3S V3 (ARA4312V3)
What it replaces
OEM replacement. No specific OEM part number is listed in the source.
Why it fits
V3 differential diagram specifies it; ARRMA requires ARA310872 or ARA310956. Source also lists: Granite 3S; Senton 3S; Typhon 3S.
Confidence: High
Source explicitly names this model or the replaced part.
Important fitment notes
Matched 1.35-module part. Supporting parts: ARA310872 or ARA310956.
Vehicle scope in source
ARRMA Big Rock 4X4 V3 3S BLX (ARA4312V3) only. V3 evidence; not V4/223S.
Only models named here by the source are covered. We don't extend fitment to other models or revisions.
Where to buy
Last seen: $9.99
Price and availability may have changed.
Verification source
www.arrma-rc.comLast verified Sep 28, 2026 · Seed verified
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