Re: Fluid for Twin Ultramatic

Posted by Tim Cole On 2010/9/5 14:25:03

Somewhere I found a letter from Packard authorizing the newly introduced Dexron (friction modified fluid) for the Twin Ultramatic (and I assume Gear Start).

I assume this was to aid the synchronous shift from L to H when in D.

However, I only use H when driving any Ultramatic because synchronous shifts are the first point of failure in most automatic transmissions.