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I am staring at 5 transmissions with the casting number 590822, trying to decide which one is likely the original. Some are top shifters, one has a Canadian top plate column shifter and one has the remains of a vacumm shift. Of course the top plates are all loose so have possibly (likely) been swapped around and the top plates are completely interchangeable so almost irrelevant.
My understanding is that this casting # 590822 was only used for a few years but the date codes put some of the transmissions as "new" as 1942.
1) Date Code: A78 Ser# pad is blank (top shift)
2) Date Code: J77 Stamped Ser# SE5ii42 7 (top shifter)
3) Date Code: A31 Stamped Ser# C18735 (top shifter)
4) Date Code: A12 Stamped Ser# N1958X (Pontiac column shift)
5) Date Code: 319 Ser# Plate blank (Remains of Vacuum shift)
#3 and #4 have an extra bolt boss sticking out on the left (drivers side), front of the transmission at the very front and very top, but otherwise look the same as the others.
The dates J77 and 319 seem the closest for my 1938 though the J77 - Oct 7 , 1937 seems the most correct as a match for my December 1937 block casting and head casting?
Do the serial#'s mean anything?
It's nice to have spares but I sure wish they were not mixed together...
Last edited by canadiantim; 06/21/08 10:56 PM.
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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All 1937-39 cars had the 590822 case. The "top plate column shifter" is a 1939 for sure. Can be converted to a floor shift by changing the cover.
My info states that 1938 units made in Saginaw have the SE prefix and the Muncie units have the MV prefix.(date numbers follow)
For 1939 it states
SG-79135 and MY-28428
There mays also be a date code near the casting number (just for the casting).
Gene Schneider
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Joined: Jun 2007
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Thanks Gene,
I thought they were just used 37-39 as well so that's why I listed the date codes from the castings. Some appear to be in the 40's...
I think the J77 or A78 dates are the closest to my Dec 1937 engine production date?
Below are the 5 different cast date codes from the transmissions. The casting numbers are all the same.
1) Date Code: A78
2) Date Code: J77
3) Date Code: A31
4) Date Code: A12
5) Date Code: 319
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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