I just wanted to say thank you all for the insight.... the diff I installed did not have the thrust buttons installed. I did remove the button from the old diff and problem solved! That being said..... I will hold off for the moment on a bearing change but I did opt to order 3 inch studs, my Weld draglites do not like the short studs even with the weld racing lugs and proper torque sequencing I tend to tweak the studs pretty frequently. Tired of cutting off lug nuts.