cart stopped

[jman69]

Hello guys
I was driving my golf cart home when I pulled in the driveway I stopped, then put it in reverse and heard a small bang and now when I push the peddle I hear a grinding sound and wont move at all I took the motor off thought I snapped the key off in the motor but it was all good so now I'm thinking It's in the rear end I look in there with a flash light while the motor was out what I could see looked good, no ware, no metal that I could see, maybe there is a cotter key in the rear end ? I have a 1986 ezgo marathon 36 volt.