I don't know how much spline is need to transmit the power. I would contact your axle mfg. and ask them. They should be able to answer that based on their axle matl., heat treat, etc.. In you haven't yet, i would verify actual engagement vs total length. What I mean is, will there be enough spline left to allow the axle to fully engage the carrier? We had this trouble on our race cars. You could shorten them enough for length, but the axle spline would bottom out on the carrier before the axle was all the way in. Good luck!
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