I have a EF 5 speed and a J3 chip with a 6000 rev limter and a 255 speed limter as soon as I rev the car it goses to 6K but the will die after doin that twice now won't go into gear and there is a vibration from 1200 to 2300 then clears?????? any help would be good thanks.

Sounds like the gearbox has had it?????