Re: Twin Ultramatic Lifespan.

Posted by Ross On 2022/10/12 19:56:37

The throttle pressure adjustment on the valve body was only to set the baseline idle pressure so that Packard could give standardized instructions for setting up the trans. In practice it is utterly unimportant as you can do everything you need to do with the adjustment next to the carb.

I recall seeing a few cars where adjusting the throttle pressure had an erratic effect. That was caused by operating levers being loose on shafts and binding linkage--usually the throttle rod being bent and rubbing on the bell housing. At this late date and with a lot of ham handed mechanics involved in the past, everything has to be looked at closely.

I prefer an air cooler. A water cooler is nice if the car is being operated in sub-zero temps and needs something to actually warm the trans when ice cold. That is not usually the case these days.

Mileage to failure is not predictable--there are too many factors involved. But here in the 21st century I never get cars with virgin TUs anymore. They have all been diddled to some degree. That is not remotely surprising------how is any elastomer seal supposed to last 67 years?