Twin Ultramatic Transmission oil pan bolts

Posted by jgrohn On 2023/4/11 6:29:10

Hello,
I have a 1956 Patrician. I had the transmission oil pan gasket replaced because it was leaking, however the leak continues. The mechanic said that someone has over tightened the bolts, so at least some of them are stripped, and no longer hold. He also said that oil was coming out directly from under the bolts.

It sounds like I will need to retap the bolt holes, but before doing that I was thinking that maybe there is some thread left farther in the bolt hole. Any chance that longer bolts would be able to hold the transmission oil plan in place? I do not have access to the car right now, so I am not able to access the bolts themselves. Does anyone know what the specs are for the bolts that come from the factory?

Thanks!
John