JENZ34

I am new to the cherokee forums and have a couple of problems on my 2000 Cherokee sport with no lift and 115K on the body. I recently blew my engine and had a new long block put in. Recently there has been some thumping right under my feet and seems to happen when I start taking off or when I hit a certain speed roughly around 30-45mph and cant figure out what can be causing that. About 2 weeks ago my jeep started pulling to the left as I am driving on the highway or at a speed of 45-50 mph it does not pull to hard but enough for me to notice. I have recently changed the brakes in the front and bleeded the brake system. Any help would be great before I take it to a 4x4 shop.