I have just purchased a 1988 subaru GL wagon dual range 5 speed transmission SPFI ea-85 with 162,xxx for $500 little to no rust. everything works except when you switch into four wheel high or low the car will drive but once you start accelerating a nasty shake / shudders start shaking the whole car and when you try and turn the whole car locks up completely. It drives in 2 wheel perfectly fine except at high speeds (50+) the car will vibrate from the rear differential a little bit. My guess is that the rear differential is not functioning properly somehow. I also have a 92 legacy that has 140,xxx that I want to swap the ej22 into the gl. If someone could help me diagnose the problem with the four wheel that would be much appreciated and if someone could point me towards a how to ej swap thread and tell what all I might need that would also be beyond helpful.