Re: Packard ultramatic slugish when it sits for a long period

Posted by HH56 On 2020/8/2 12:46:04

The converter fluid drains back into the pan within a few minutes after the engine is shut off. When starting the engine again fluid has to be pumped back into the converter before much can happen. You didn't mention a year or whether this is something new so it could be a normal delay or possibly something like a clogged inlet screen or sticking valve is restricting the flow of fluid and it is taking longer than normal to refill the converter.

Another possibility is a sticking valve or a low pressure delaying the application of the high range clutch discs in a regular Ultra or the discs and/or the low range band in a Twin Ultra. Either delay would let the engine race with nothing happening until the clutch or band had a tight hold.