Packard Forum Index » V-8 (1955-56)

You installed the old fluid after rebuilding it?

Ha! Negative.

I don't tend to clarify properly anymore.

I started with STP type F after the trans rebuild.

I typically run fresh fluids for only a handful of heat cycles after rebuilds then change it out.

Supershift will go in tomorrow for the long duration of daily driving.

Gotcha. However I don't see any reason to replace the fluid so soon. Unlike in an engine rebuild where you have to break in new rings and honed cylinders, which creates much metallic debris, there is no equivalent occurrence in a rebuilt transmission. As you probably know, worn clutch or seal material will not damage anything, and there is more of that by far in an old unit than new. Bushings are comparable to the engine bearings.

Likewise, Type F should be adequate, but if you change it, we would appreciate hearing about any perceptible difference in feel or operation.

It's mainly piece of mind as far as changing oils from my racing years!

I will maintain updates