so I have a non Y-BLOCK question involving the c-4 in my 57 f100.A few months back I had my c-4 rebuilt by a shop.It lasted 5000 miles when the main seal behind the torque converter started squirting fluid out.I tore it all down and found the main bushing to be fried.The torque converter is also fried ,has gouge marks indicating it was woppling. My flex plate isnt bent,and had everything tightened down correctly.Checked to see if the torque converter stud extensions were all the same length[the c-4 adapter has stud extensions].Everything seems to be true.I even bolted the torque converter back up to the flex plate to check to see if everything is true.I used a dial indicater to check while I turned the engine by hand ,and it seems fine.What could have caused this?The c-4 is still under warranty,but I dont want to tear this down again after another 5000 miles.I might just switch back to a manual trans,as this is the third time I had to take this trans out.Has anybody else had this problem?

55 fairlane gasser 312 /c4, 57 f100 292/c4, 52 mainline gasser 302/t10 4speed

Barring external alignment or centering issues, I think it would be one of the following

1. The shop may not have replaced the front bushing during the rebuild and it had too much play.  Or damaged it putting it in.

2. Torque converter hub was not true or the converter was out of balance slightly.  Bad converter out of the box is too common in my experience.

My vote would be the converter.

Hey Guys;   Have the same adaptor in my 55 Bird.   Sounds like a Flat-o-matic kit.  There is a spacer between the crank and the flexplate, Did they forget to put it in???     Hope this helps     Good Luck    God Bless   Eddie

Eddie

Lake Forest, Ca. 92630

Yes,I have the bushing in .Thanx for the replys,I was thinking that it could be the converter,but wasnt sure.Im taking the thing back and having it redone.Thanx!

55 fairlane gasser 312 /c4, 57 f100 292/c4, 52 mainline gasser 302/t10 4speed