Hi All,
My transmission has recently developed a light scraping sound. It is present in all gears, forward & reverse, as well as neutral.
If the truck is stationary, it is only present when the engine is on, clutch is released, and the transmission is in neutral.
On the other hand, if the truck is moving, the only combinations where the noise <u>isn't</u> present is when the engine is off and the transmission is neutral (clutch in or out - it doesn't make the sound either way). See attached chart for breakdown.
I noticed the problem after flushing the transmission fluid. I did this with a new clean transfer pump (did not remove the shifter) and filled until the fluid trickled back out of the fill port. I used Valvoline Mercon V (not the Dex/Merc stuff - see attached photo) as I saw it recommended in a couple other locations. Of course, I was also listening for problems after flushing the fluid, so perhaps it was present before. I can't definitely say either way. I also changed the diff fluid at the same time - but I wouldn't expect this to cause it as the noise can be heard when the truck is stationary - diff not doing anything.
Looking at other threads, this one describes a similar sound (but occurring at different times, as mine is audible in all gears).
5MOD scraping sound in neutral 1st 2nd and 5th The shifter doesn't feel sloppy or loose in any way.
Has anyone had a similar issue? I'm hoping for some direction as to where to look, as well as whether or not it's likely a 'critical' problem. I'm not as familiar with the internals of 'what moves when' in the transmission as I would like, so I'm lost as to where to begin. Thanks for your help!