Anybody know whats the diff between a s20 and a s40 5 speed trans someone told me years 92-95 and 96-98 is there anything else different????im askin cause i got a 98 civic ex with trans trouble (reverse is slipping) and someone said i can use the s20 trans he gave me......ANY HELP WILL DO?????......ANY PROBLEMS,CONCERNS,WARNINGS???????? PLEEEEEASE HELP I BARELY GOT REVERSE