Yesterday we left home for a ten hour drive down to Croatia . I have put lots of miles on my 55 Chevy 210 with 235/3 speed OD , but yesterday it developed a brandnew noise: Coasting in any gear will sometimes result in a screeching or howling noise, until the OD goes out and into freewheeling at about 20 mph. Sometimes it is quiet in deceleration just as usual. I had a feeling it could be the sprag or freewheeling thingy in the BW OD . But cruising the Croatian coast I heard the noise even with the OD lever pulled out. My plan is to find a shop with a lift down here and see what I find... I will check fluid levels,look for back lash on pinion and wiggle the u-joints... What else do you think I could do?