Hi, hope there is someone who has actually rebuilt this box who can help.
I am trying to identify which gearbox rebuild kit to buy before I take the box out. I have narrowed it down to a couple of Getrag kits but the various descriptions online don't really give me enough confidence to push the button. As I have a trip to the US shortly I am collecting up parts. I have already ordered a new clutch, but don't think this is the issue. So considering doing a rebuild of the box at the same time as changing the clutch.
Its the 5sp NV3550 box, vehicle was built June 2004.
The difference between the kits seems to be the countershaft journal diameter.
Kit BK235GWS is described as 97 up sync reverse, 3 piece 1-2 syncro 30mm
Kit BK235FWS is described as 00-02 sync reverse, 3 piece 1-2 syncro 32mm
Apart from the characteristic clunk into 2nd (already changed the Oil to Redline), the main reason for the speculative kit buying is "whirring grumble" when at idle which stops completely when the clutch is fully pressed, still in "N". Also if you drive up a short steep hill i.e. a driveway at engine lugging speeds with 1st fully engaged it sounds like a loud rattle from the box. I suspect the input shaft bearings.
Any thoughts or guidance will be much appreciated..