Re: ultramatic to chrysler 727

Posted by Peter Packard On 2007/9/20 3:27:41

Hi all, It took 5 removal/replaces on my 56 Patrician (yes with the PB auto) to sort out that the main problem was around 0.010 wear on the input shaft where the rear pump pressure goes in. The Packard Ultramatic is a very good box when it is working properly. The unfortunate thing is that most automatic gearbox repairers have no knowledge of converters which "lock-up" or of rear pumps shutting down front pumps.
The problem with any of the modern transmissions and a Packard transmission that does not change over to the rear pump and engage the converter contemporaneously (at the same time) is that the converter overheats and cooks the gearbox. The modern gearboxes get over it with very low stall and lightweight cars. With a Packard Ultra or twin-Ultra you had excellent engine braking and it runs very cool, even towing very heavy trailers. I have had a Torqueflite V8 trans ready to install since 1978, but I cannot convince myself that it is an improvement.
I have tried to second guess Packard engineering on a few occasions without success so I guess that I am either truly brainwashed or a genuine Packard Nut. Peter Toet
P.S. Get the Ultramatic box repaired/ overhauled