dayradebaugh Posted January 7, 2017 Share Posted January 7, 2017 Hopped in my B81SX with a quad the other day. Temp was about 20 deg. F. Main box shifted fine, but back box (4 speed) would not shift, at least easily, for about 5 miles. Would it be safe to put synthetic in this transmission? If so, what weight? Any brand recommendations? Would I need to flush out the old fluid before switching to synthetic? As you can see, am in the process of installing a Holmes 750 on the unit. Will be hooking up a PTO to the transmission, so now is the time to change the fluid, if possible. Also in the process of installing fenders on the wrecker bed, as below. Thanks for your help. Day Radebaugh 2 Quote Link to comment Share on other sites More sharing options...
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