Traxxas heavy duty half shafts (short) for the T-Maxx 2.5 (2) Black nylon. Heavy-Duty Half Shafts (short) for the 2.5 T-Maxx. These come out of either side of the transmission. INCLUDED: Two heavy-duty short half-shafts external-splined. Two heavy-duty short half-shafts internal-splined and Four metal U-joints Will not fit original T-Maxx with .15 engine