i just put a b16 in my civic and i took it for a spin for the first time and i was driving once i put it in to second i heard a snap and it dont catch gear anymore and when i put it into gear the speedometer goes to 20 but the car dont move help?

 

axel snap or it come out

if thats not it
drain the tranny oil and see if theres any metal shaving

 

and if there is shaving then what am i supose to do? what if there isnt any shaving and the axle didnt break u think its the linkage?