Gearbox Id help please

[Steve Nau]

I am not sure which gearbox I have in my 56 coupe.
Can anyone tell me if it is a 519 or 644 from the attached photos?
I am told the serial number should be on the bottom spine but all that is there is 5622H4.

[RSTOAD]

it is early for sure, 644 would be a an unbolted case, one piece thru the body, so 519. Others will likely give you more detail

[Vic Skirmants]

5622 H4 is the trans number. The early 356A cars used that 519 housing with a dual-mount nose; incidentally Porsche referred to these transmissions as "644" due to the dual mounting. My records are spotty in that number range; most seem to be single-mount pre-As, but yours is in that range that begins to change to the dual-mount. When was your car built?

[James Davies]

5622H4 is a 1955 519 transaxle. Probably from a ~May 1955 car. Originally it would’ve had a single mount nose cone as Vic mentions. The last pre-A coupes and cabriolets had transmissions in the early 7xxx numbers, and of course all of these had single-mount nose cones. The 356A introduced the dual mount.

Vic, I suspect the first dual mount transaxles would’ve been in the 7xxx range? But there would have been a number of single-mount ones in this range as the last pre-A Speedsters were produced alongside the first 356A coupes and cabriolets in late 1955. Does that sound right with your data Vic?

[Vic Skirmants]

James'; that's pretty much what my records show.

[Jon Bunin]

The 356A introduced the dual mount.

The A series also introduced larger rear mounts with three fastener points, and a clutch shaft that extended to the RH side of the case.
This transmission doesn't have either of those A features.

[Vic Skirmants]

The 356A introduced the dual mount.

The A series also introduced larger rear mounts with three fastener points, and a clutch shaft that extended to the RH side of the case.
This transmission doesn't have either of those A features.

Good eye, Jon! So we can assume it is an earlier case with a dual-mount nose added. The "27" and 113 part number would be from August 1954 til about March 1955. Too early to be a "644" style.