I have cracked yet another TC hub. This time it is not as bad as last time. I have talked to Dave(great guy to deal with) at Yank and he told me what he believes can cause it. It is being shipped to me even as I write this. I do not think it can be high pump pressure the pump drive has no damage and the teeth are not shearing off. We talked about possibly being the flexplate and I agreed to get another one. We talked about an alignment issue and that will be checked in depth when the shop has the car back on the lift. Is there anything else that should be checked out while my car is on the lift and the flexplate is being replaced.

This is in no way bashing Yank Performance. I think that they have a wonderful product and I have to figure out what is going on, on my car. I had a cheaper converter installed before my tranny rebuild and it had a very bad vibration and shaked very bad. Could it possibly have damaged something or caused something to be misaligned that I may need to look at.

Please give me some help this is getting expensive and depressing not having my car to drive around.

 

I also want to add that I still have the stock Factory Torque Arm mounted to the trans.

 

Do you notice any peculiar vibration, like if you free-rev
it slowly? There has to be some consistent thing that
stresses the hub. Maybe your trans is manufactured
off-axis or something. I would not expect shaft load
(pump etc.) to do this, but something that fatigues
the metal.

 

That is just the thing I feel no vibrations with the Yank converter. I never had this problem until I got my trans rebuilt and changed converters. The first converter really shaked bad.

 

Anyone else want to chime in with a suggestion on what I need to check. The torque converter and UMI Torque Arm are going to be here this week.

 

Which Converter from yank do you have?

Mike.

 

SS4000

 

I've seen any problems with the hubs on that style converter. Is the hub physically cracking or is the weld around the hub cracking? did you have to use spacers between the flexplate and the converter?

Mike.

 

The hub is cracking starting at the corner of the pump drive and going toward the center.

 

Check the pilot size on the crank with a caliper and measure the converter hub. Make sure something isnt off there.