Ive got my pel-lok bolt kit for my 020.My diff is on the table and im ready to drill the rivets out.The engine was used as a generator and the diff. was locked.(forced)It was overheated and started to protest(clutch started sticking,didnt want to dissengage),soon after it was dissassembled(by me)The spider gears show signs of wear .Do these gears need to be in constant contact(no play)?Im afraid they have machined clearances out between them causing unwanted outcome,can this be bad?how bad?Im buyin a 81 rabbit w/cis for the td con. it has a 5 spd.can i swap in this diff.?