car likes to pop out of second gear, sometimes doesnt even like to go into it. . .and its making rattling noises all the time now. . .whats the problem?

its a d-series. . .worth fixing? just get a new tranny? or what

 

like new synchros yo..its worn u need to replace them..i say get a new one..d series tranny are not that expensive...heck i got a dx one for like 80$