Re: GM 4L60E Transmission Adapted for 1955 Packard 400

Posted by Gerard O'Keefe On 2011/9/15 18:40:45

I have no idea why you would change over.The Ultramatic and Twin Ultramatic is a pretty good transmission. It is far better than GMs Power glide or Chryslers Power flite. I have owned both and the Packard trans is superior.