just bought a b16 i was driving it on the interstate in 4th gear at 3500 rpm and outta nowhere it downshifted its self i guess slowed down fast now it will go in a gear but not move the tires like the brakes are locked it stalls out

 

Sounds like a bearing is seized. Could be diff bearings. Did you have any fluid in the transmission?

 

I HAD just bought it i didnt check the fluid i jaced it up and put it in gear it acts like its confused whether it in 1st or reverse if i dont stay in the gas the tire rotates in rev. with a sound in the trans like somethin is loose