If I remember correctly the 3-speed synchro was introduced from the get-go on 9th Series Light Eight, Eight and Twin Six; on the other models it was introduced as production capacity caught up with demand, a 4-speed synchro being used in the interim.

But regardless of what might have been OEM and what trans might be in the car today, hypoid gear oils aren't the best choice to be used in synchro gearboxes.

The 9th Series introduced synchromesh transmissions. Using a hypoid gear oil in a synchromesh transmission is counter-productive, the slip additives inhibit the function of the synchronizers.

Was I in error, was the hypoid Angleset differential gearing not introduced until the 9th Series? If so my advice on an extreme pressure gear oil such as GL-4 or 5 being essential for an 8th Series was incorrect.

SAE 50 motor oil is quite adequate for the Bijur chassis oiler.

A GL-1 simple gear oil (typically straight mineral gear oil plus a defoamer) of appropriate viscosity for the transmission. Higher viscosity will supress gear spin a bit and make summer gear-changes a little easier; perhaps a SAE 120 year-round.

You have a hypoid rear axle so an extreme pressure gear oil such as a GL-4 or 5 is required. It might also be suitable for the transmission as you don't have any yellow metal synchronizers to be concerned about, yet were it mine I'd stick to a GL-1 for the trans just to be on the safe side.

As to viscosities, old time recommendations were typically SAE 90 for the winter, 140 for the summer; you could use a multi-vis that comes close in range to these values.

Yes, A. O. Smith was a supplier of frames to Packard from as early as the late 1920s (and perhaps earlier) thru 1956. They later sold off that business and are currently a major maker of hot water heaters and other similar appliances. A while back a friend was able to contact them and obtain their engineering prints for a particular 6th series frame but more recently I have been advised that they no longer have these archives.

And probably of lesser benefit on those Packard engines with a fully submerged oil pump.

Gunther Hoyt in VA had the rearward tilt hardware package for the senior car trunk racks reproduced some years back. Be may still have it available. Contact info in the CCCA and PAC directories.

Highest in my database is D59097 which is a 1955 400, VN 5587-7320.

Edited.

It almost certainly a "D". 55 and 56 theft proof numbers are in large part without logic, mostly an orderless jumble. Some 56s are "C" and some 55s are "D". Some are blank, and some reuse numbers from the late '30s without an alpha prefix. Another indication of the lack of the old internal order of things that followed the switch to Conner, the nice, neat progression on theft-proof numbers ceased with the end of assembly at the old plant.

PPG Almond Green

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