Packard Forum Index » Post-War (1946-54)

I need the big end bore spec for the connecting rods " with out the bearing installed but the cap is torqued" I have the Packard service manual and the section in the back with all the specs it does not say. Also still looking for a good lower tank for the radiator it measures 20 1/4 x 2 inchs One from a manual transmission would best even though mine is a ultramatic I will be using a external trans cooler.

Using an external transmission cooler alone is not a good idea as it will cool only when in motion. Stopped or in slow traffic, you'll likely damage the Ultramatic. At least put in an inline cooler that was introduced later in the year which uses coolant circulation to help keep the transmission temperatures down.

I would tend to agree with Packard Don.

In my way of thinking it's best to have your engine's coolant system controlling the temperature of your transmission. Although no harm in adding additional cooling capacity by way of an external cooler as well. I think it's just as important to have a well maintained cooling system and engine because if your engine is running hot, so is your transmission.

It's valuable information for maintaining the Ultramatic transmission system in the Packard.