s13 rear end help...

[GL Chrillz]

this problem started when i went up to 15psi the other night (normally im at 10, manual boost controller for 10 or 15) and i put the pedal to the floor, and then got some clunking in the rear and now it doesnt want to go. it gets better in 4th and 5th. theres also a noise under the shift knob/tranny area. i have some videos. theres a mix of the welded diff tire gripping and the noise, but im sure you guys know what to pick out

YouTube - ‪rear end noise‬‏ (http://www.youtube.com/watch?v=UhUS67jw_R8)

YouTube - ‪rear end noise‬‏ (http://www.youtube.com/watch?v=-m0ydRyJLdY)

YouTube - ‪sr20det trans noise‬‏ (http://www.youtube.com/watch?v=7dBcThj62TA)

[ZilviaKid]

cant listen to the clips at work but maybe you ripped up your bushings

[GL Chrillz]

what bushings would it be? i checked the boots on the axle, they didn't look ripped at all from what i saw so i imagine the cv joints are fine. could it be the u joints maybe?