synchro rings ride on the cone portion of the gears, to gently bind to the "free spinning" gear, to match speedds so the slider sleeves can engage the true gear. if a synchro is bad, often it will feel like a blocked shift, as you will have difficulty getting it into gear, or it grinds a little getting it into gear. once in gear, i donl;t think the synchro does anything else.
if you hear/feel a grinding while in gear, then it may be a bearing / bearing shaft issue, or the shifter fork is out of adjustment rubbing on the slider sleeves. if you manipulate the shifter, while in gear making the noise under load, and the sound changes, it may be an adjustment issue. if the sound doesn't change, then it may be a bearing / bearing shaft issue.
i guess make sure your oil is full. maybe switch to a slightly higher viscosity ? and give it a try ?
1995 RT10 , 1999 GTS ACR Heffner TT
1999 GTS ACR Roe SC, 2004 RT10 TT
Last edited by davy442; December 23rd, 2019 at 08:57 AM.
Reason: didn't take my medicine this morning yet