Ring swellers are a very short term fix. Usually used after a tranny has been overheated, and the Orings have become brittle, cracked, and allow fluid to pass under pressure. If left untreated, the damage is more severe to the tranny, as slippage causes clutch and band wear.Doctor Zoidburg said:I would prefer to use a commercial ring sweller and only resort to using brake fluid only if I had no other choice.

