The trans in my motor home has made a growling or slight grinding metallic noise after it shifts into 3rd gear. It only does it for maybe 3 seconds and it doesnt seem to affect the operation. Only way I can describe it is that it grinds, and shudders then goes away. I have towed my race car all this year and it has not caused any issues at all. I am planning on driving out west next year and would like to figure out what the deal is before I hit the road. Anyone familiar with this issue? Also if a rebuild was in order what improvements can be made during a rebuild?

 

Often new ATF will fix this. Changing ATF Fluid in a E4OD and 4R100 transmission .: Articles