Is mercon sp an acceptable synthetic for use in the transfer case of an 06 superduty psd4X4, or would an aftermarket synthetic, substitute like Mobil, or Amsoil ATF be a better choice for the transfer case? I thought it would be easy to service with the mercon sp because I service the transfer case at the same time I service the transmission (Torqueshift).
2006 F-350 PSD FX4 CC LB SRW 4X4
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