3rd gen rear end in 4th gen

[mmikeman]

Thank for the response, going to order some 1.5" ones now and cross my fingers this will work and well, started out making a grinding noise from the right rear tire only in 4th gear that progressively got louder, thought it was a wheel bearing so had someone check the diff out and they told me bearings were fine but said the fluid was pretty burnt and that my crown and pinion are likely really worn down found half a tooth in the case as well, kept driving anyways because I was tight on money and now the transmission is hitting 3rd and 4th gear and reving up high after it hits the gear, I thought maybe it was slipping those gears but it seems to hit them when I'm wot its almost like its struggling to move the back wheels in those 2 gears needs to rev high just to go anywhere, 1st gear and 2nd are fine, checked the tranny which is only a year old with a deep pan and cooler and found no shaving in the pan and the fluid is still pink, is there a chance this is the tranny to or can a bad rear also affect some behaviour with the transmisson, someone was telling me a noise in the tranny can travel up to the rear somehow, tranny is an a4 not manual which I know is a weak point to