hi so im having an issue pinpointing where the noise is coming from but heres whats going on. when i get over 30ish its starts making a loud wamp wamp wamp kinda like an old dryer machine. when im decelerating it starts shaking the car feels like from the rear end. haven't had a chance to start looking at it but just trying to get an idea where it might be coming from so i can start looking into it

 

Probably wheel bearings

 

so thats what im guessing. on the drive home found some more info. it only does really while its in gear. when im taking a sharp left it will clank once or twice super loud

 

Check your driveshaft u-joints and pinion bearing while you're under there too.

 

is there a good way to figure out what side i should look at? im guessing its the left side because it makes a horrible clunking sound when i turn left. but the rear is welded so wouldn't it do the same thing turning right too?

 

Check both sides. Go on youtube and check out how to check wheel bearings and u joints, theres some pretty good stuff there. You might wanna look into the front axle shaft ujoints also

 

after pulling the diff cover looks like theres a HUGE crack along the differential case and also took acouple teeth with it :/

 

so im trying to figure out the cheapest way to fix this issue, it did exaclty what is in this pic http://www.fordf150.net/photos/data/500/broken.jpg / i could replace the whole axle for about 250-300 from junk yards in the area. was also looking into replace the internals but i don't think i would be able to install them ----- im very new when it comes to the internals of a diff :/