Hi, I have recently completed a 6 Speed STI gearbox conversion on my wrx. Everything seems to be fine apart from one thing. I accidentally put the two rear axles in the wrong side left and right so one axel was sticking out of the diff about 10mm but not enough to lose any oil. I swapped them around and fixed them but;

Upon driving in first gear between 1500-2500 rpm there is a vibration that seems to be coming from the left wheel/axel/diff area. It is not present in any other gear or at any other engine speeds. It is nothing severe but is still concerning me. Could the diff have been damaged because of using the shorter axel for a short period of time? Is there any chance the diff is the wrong ratio for the gearbox? Is it just a coincidence that my wheel bearing could have failed at the same time I put these parts in my car? Could it be the r160 is somehow not compatible with my 2006 WRX axels? Specifications:

- 2006 Subaru WRX sedan
- 2007 Subaru WRX STI JDM 6MT transmission
- WRX GD 5 speed pull style clutch
- STI tailshaft
- R160 diff apparently with matching ratios to suit the gearbox.
-2006 WRX axels
-DCCD controller NOT currently installed
- Wheel alignment completed