nightflyer767
New member
"My 3GM30 will run smooth for
"My 3GM30 will run smooth for hours then randomly start a loud clanking vibration in fwd gear only. Sometimes it will smooth out after going back into neutral then fwd again. Smooth in neutral and reverse. Sometimes accompanied by delay in fwd gear engagement after shift lever is moved into fwd position. Diver says shaft and prop are ok. Couldn't get it to act up for mechanic who didn't think it was the transmission, but it sounds similar to a previous post about an intermediate shaft thrust washer problem. Any troubleshooting ideas?"
"My 3GM30 will run smooth for hours then randomly start a loud clanking vibration in fwd gear only. Sometimes it will smooth out after going back into neutral then fwd again. Smooth in neutral and reverse. Sometimes accompanied by delay in fwd gear engagement after shift lever is moved into fwd position. Diver says shaft and prop are ok. Couldn't get it to act up for mechanic who didn't think it was the transmission, but it sounds similar to a previous post about an intermediate shaft thrust washer problem. Any troubleshooting ideas?"