TRANS GRINDING IN NEUTRAL MANUAL TRANS

Sounds like you are low on fluid. Tow it to a shop because you are potentially doing damage to the transmission because it is probably in gear but doesnt have enough fluid to fully engage the clutches and is just sitting there slipping. Have you noticed any kind of leak on the driveway?

Automatic or manual trans? Manual trans could be throwout bearing. Other moving parts at idle that have bearings - alternator, a/c compressor, water pump. Auto parts store or harbor freight sells stethoscope to listen to stuff like that. Use it to determine where sound comes from. Careful when using near moving parts.

The local trans shop has no experience with a VW Standard
Trans & they mostly do just automatics,so they don't want the job

I would find a shop that will repair yours

the throw out bearing is bad ,so change bearing and clutch

shift solenoids and timing solenoids in the transmission

i would say the fine grinding was when you put it in park the output shaft was turning and the parking paw was trying to engage into park then the paw engaged into park but you say it rolled i am thinking that your problem is in the transfercase

You say 'new' truck, 09? or new used? I have had 3 Fords, 3 w/ manual trans. case, if you go into 4x4 Low range, you must come to a complete stop before shifting the trans. case to 4x4 mode, and I always put trans (automatic) in neutral before slipping into 4x4, it engages smoothly, no grinding. 4x4 high range can be put in while moving, but I would let off the gas pedal, shift to 4x4 high range, then resume accelerating. If there is any grinding going on doing it as above, something isn't right. Check the trans. case fluid level also, to make sure that's not an issue.

Sounds like the trans imput shaft bearing. They tend to wear and cause shifting problems. It also could be synchronizers. Marlin Crawler makes aftermarket trans bearings for these transmisions.
www.marlincrawler.com
I hope this helps. Also check tranny fluid and clutch. a worn or bad clutch will also cause this.

I have the same problem in my 1991 Integra LS Sedan Automatic, when i put it in reverse it makes a grinding noise and won't engage...i've been told the "reverse fork" or something is probably bent which can be common from rocking a car from "D" to "R" to get unstuck from mud or snow and to fix this the tranny needs to be taken apart and fixed, or if any cheaper then replace the transmission. Could also do an auto to manual trans conversion, but those are the only options. Fixing the specific reverse problem would be cheaper than rebuilding the whole trans which a lot of ppl say is the solution

When the car is sitting idling,and the clutch is not depressed,it makes a grinding noise because the input shaft of the transmission is being forced to turn by the clutch,which is engaged,and even though the trans is in neutral,the input shaft is still turning,and this is called "neutral roll over" noise,and some of the assemblies inside the trans are freewheeling around.The noise goes away when the clutch pedal is being depressed down,because the input shaft of the transmission is no longer turning.So it does sound like an internal transmission problem.It is still possible for the throwout bearing to be bad,and it can be checked when the trans is removed from the vehicle,Remove the throwout bearing from the trans input sleeve,and press down on the bearing flange and turn it at the same time.It should feel smooth and free.If it catches or feels gravelly,then the bearing is bad and that could be your noise.Also,turn the input shaft of the trans and same thing,if it's smooth and free or if gravelly feeling......Good luck.