HelloCustomer and welcome to Just Answer, it sounds pretty straight forward. If you had not properly re-assembled the rear yoke you would likely experience a clunking on and off of accelleration as the torque affects rear pinion preload. How many miles are on the Trailblazer? Usually I would not expect excess wear on the yoke without miles to justify it. I am going to send the removal and installation instructions. Just to put your mind at ease, I would suggest checking the pre-load as described in these instructions. If it is too tight, you need to replace the crush ring. If it is okay I would look closely at the yoke for wear as it is the actual sealing area. Hope this will help. Please let me know if you need further info. Steve T.
Drive Pinion Flange/Yoke and/or Oil Seal Replacement Tools Required