i was driving my car the other day on the freeway and had it in 5th its a JDM GSR w/LSD and 4.7 final drive and it just POPPED out i tired to put it back in and as soon as i gave it gas it popped out again all my other gears are just fine its only my 5th... does anyone know what it would be???? plz and thanks

 

check your trans fluid level. and work from there.

 

level is good

 

outer mainshaft bearing is likely bad, time for a teardown and inspection.