Re: Twin Ultramatic problem

Posted by BH On 2009/6/14 9:51:44

Since you experienced a grinding noise on an upshift, it isn't likely a problem with the planetary gear train since that's only turning in low range or reverse.

That you're hearing the noise when it shifts into direct drive certainly suggest the problem is within the converter - though that clutch is controlled from within the transmission.

A moan or groan could be due to a glazed lining (but why all of the sudden?). That condition might be alleviated by alternate fluids or additives.

However, finding the source of some other noise involving the DD clutch will likely require removal of the converter and inspection of its internal workings. Yet, since I've only ever had one of these apart just once, and that was decades ago, I wouldn't even want to venture a guess what it may be.