Is Lucas transmission fix ok to use?

From what you have said i would save your ten bucks and put it towards a rebuild and put your energy towards finding a good shop. Ask around or visit a few tranny shops and see if you can find a shop that is reliable and fair. If you take it to a general repair shop the chances are they are just going to send it out and mark your bill up a few bucks for their effort. Word of mouth is best but sometimes you just can’t get a good referal and you need your car fixed quickly. Look for a good warrantee.