Packard Forum Index » V-8 (1955-56)

My '55 Clipper Super runs well, but as I accelerate from a stoplight it "slips out of gear" at about 15mph (in effect, shifts to Neutral). Happens in either the first or second Drive position on its Twin Ultramatic.

If I let off the accelerator while rolling, in a few seconds it will grab again and shift normally.

Seems it might just be an adjustment, but all suggestions appreciated.

Does your car have a Rochester carburetor?
packardinfo.com/xoops/html/downloads/SC/SC-VOL29NO3.pdf

Might want to look at this for help
packardinfo.com/xoops/html/modules/serviceinfo/seriesindex.php?series=1

Sounds like a low fluid of plugged filter issue (presuming it has one). Once you've checked the previous possibilities, that might be next to look at.