Is it possible

I have a leak on a rusted transmission cooling line and wondered if you can replace it all with rubber instead of the steel lines that are there? Is there any down side to that. It appears a replacement part is $82 and the hose is about $8. I just don't wish to bugger up the transmission. Any views would be appreciated.

Yes, they make tranny cooling hose- done it many times. rubber does not corrode.

Make sure it is a rubber that can handle tranny fluid. Some will allow tranny fluid to penetrate in and soften as well as expand the rubber. Then it will just blow apart if it has any pressure in it. That is why brcidd said "they make tranny cooling hose". I can't remember which rubber hose is an absolute no, no when it comes to that. I know I've used anything just to get home in an emergency, then immediately bought the correct hose material.

These guys are right. It must be a neoprene lined hose like power steering hose. Any other rubber hose will soften,swell,leak and burst under pressure... in that order. Like 65comet said any hose can be used temporarily in an emergency. But ya need to change it soon before you forget about it.

Thank you all for your responses. I was able to get transmission rubber , disconnected the line, did a clean cut, flared the end and put in the rubber tube with a brass hose connector. Worked great, thank you all that responded.