12-01-2014, 05:11 PM
Join Date: Sep 2014
Location: New Zealand
Without driving it myself. it does sound like either the rear bearing in the gearbox is loose allowing things to float, or a worn centre bush in the mainshaft. Either way its only apparent in the 2 top gears suggesting its in the "output" half of the gearbox, which suggests the rear half of the mainshaft and / or output bearings. Might be time to drop the box and strip it down and take a look.
The 6.5:1 gears won't be helping things on the over run either as things will be spinning a bit faster. Its always possible its the transfer case thats causing it, but there again, hard to tell without driving it.
2015 5 dr Grand Vitara 2.4 (daily driver)
2008 Swift M15A
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy
"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."