Re: Towing a 1951 Ultramatic

Posted by HH56 On 2019/8/1 19:19:33

Fluid from the drain hole in an otherwise undamaged trans is typically coming from the front seal. Transmissions that have sat for years generally have seals that are dry, hard and possibly cracked. When the engine starts turning, the dry converter pump shaft rotating against a dry and possibly hard neoprene seal doesn't need much time for a leak to develop. Once pressure is present and oil starts flowing into the converter it can get worse if the pump shaft bushings are worn. Instead of trying to hold back a few drops of fluid that might get past the bushing it needs to hold back considerably more fluid that is under pressure. Front seal leaks can really lose a lot in a short time.