3-spd transmission original? - Impala Tech
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post #1 of 5 (permalink) Old 11-03-2011, 06:37 PM Thread Starter
Join Date: Jul 2011
Location: Hungary
Posts: 48
3-spd transmission original?

The previous owner of my 1966 Impala just stopped by today and dropped off the transmission that was "in the car when he bought it" (that was over 20 years ago). I was hoping for some help to see if maybe it was the original transmission.

The car: European 1966 Impala, 4.1L, 3-spd. "Made in Antwerp"

The transmission in question:


On the left side of the transmission case, near the shift arm I see the numbers "GM 4 3858992"
Under that is "K245"

I took the "3858992" to be a casting number but didn't know much else about it. I also looked on "oldride.com" and couldn't really tell if the "K" number was the number I was looking for. If it is, then I have a McKinnon 3-spd, made in February, and that would make the 45 the "day" but I don't think February has 45 days... maybe 45th day of the year?


On the right side of the case, there is a D and an N, with an arrow pointing to the "D". I assumed that to mean that it was made on "Day" shift.

Under that is "GM2"
Under that is "3858986"
Under which is "M8 5"

I hope I wrote this so people could follow. If needed I could always take pictures (after all, a picture is worth how many words?) but any help would be greatly appreciated.

Thanks guys!
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post #2 of 5 (permalink) Old 11-03-2011, 08:37 PM
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There should be a code stamped into it (instead of cast) that starts with an S like S123 or S1020. That will be the assembly date of the trans.

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post #3 of 5 (permalink) Old 11-04-2011, 07:10 AM
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I have a 3 speed in my 66 caprice that is original, I got the Warner Gear (BW) Heavy Duty 3 Speed since mine was a big block 6.5 litre 396. Sounds like yours is a 3 speed Saginaw and I believe the K245 is a date code which I think decodes to something like 10-24-1965 day shift. K is just the months and I think they skipped I. Do you have the build date on you trim tag you could verify that it is latter than this date.
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post #4 of 5 (permalink) Old 11-05-2011, 05:22 PM Thread Starter
Join Date: Jul 2011
Location: Hungary
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Warren: I cant, for the life of me, find any stamped numbers on the transmission. Can you point me in the right direction? I'll be the first to admit that its not the cleanest thing in the entire world, but so far I've come up with nothing. Maybe when I get a free day I'll get out the soap, scrapers, and scrubbies.

Wogman: Here's the numbers from the tag on the firewall.

General Motors Continental Antwerp
Make: Chev Model 16339
Chassis no: CA-6163393020
Release 6-3307-6 Paint 478
Trim 866
Engine # 09 6218718

The numbers stamped on the engine match those on the firewall tag. I tried finding the numbers on the rear axle too, but so far I'm not having much luck. I'm thinking they might have a thick coat of paint covering them.

Thanks guys
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post #5 of 5 (permalink) Old 11-25-2011, 12:03 PM
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date code

K - 11th month (November)
24 - 24th day
5 - year (1965/1975/1985)
believe cast iron Saginaw three speed trans production ceased at end of 86' model year. Base C-10's switched to 4.3 iron V-6 with an aluminum
five speed.
Don't know if Julian date codes were used on transmissions. Have seen
them on Saginaw cast iron steering box housings.
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