I have used both BG syncroshifts and both work great. I currently use Redline MT-90 which is recommened by Shep and TRE (TRE built my trans) As far as the transfer case I was warned by TRE that the wax particles in the Redline Shockproof series can clog up the passages in the case over time and cause damage. Diaqueen was highly recommended for daily driving.
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