Big 8000 series Spicer 5 speed is what I remember from the one I had, same as the few a friend of mine has.

Thought I had a picture of the tag in the glove box, but can't find it right now...

Here's one of the transmission.
http://rides.webshots.com/photo/2071861450080251109GtWGtI

I assume there were other options, but seems like the Spicer was common.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-