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Manual Transmission Number - Decipher?

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Hello! This 1992 900S convertible is fairly new to me, and I am happily sorting things out! It is clearly a 5 M/T but I learned the VIN says it was 3-A/T per the VIN. YS3AK76E1N7xxxxxx (7 = 2-door Convertible (CV); 6 = 3-speed Automatic; E = Fuel Injection, B212 (2.1 liter 16v)). Here is the number on the manual transmission. Does the "06" mean is was manufactured in 2006, therefore could only have been installed/converted in 2006 or later? I am trying to pin down the age of the transformation, and learn how many miles are possibly on it. thx for any guidance!

G 457 06
494786


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Discussion Starter · #3 ·
thanks for the info! I was hoping of course I would hear it was a 'newer' transmission added to the car. How is the model/number read to see that it is from early '80s? I'm interested in learning details like this.

I guess the positive thoughts I have on this is that the transmission transformation hopefully included finding a quality donor MT, and that good care was taken to refurbish everything during the installation! That is what I going with!

Again, thank you for your ongoing help!
 

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The FSM has the key to decoding the G or GM number... should be in the stickies in the c900 forum. In this case, the fact that it's a G and not a GM means pre '86, so that's small drivers/pinion/synchros. Of course, 30 years later, it's impossible to know what parts may have been swapped or changed or replaced, but in my experience when it comes to c900 transmissions most people just find one that works and put it in.
 

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I bought its brother earlier this fall, exact same number, and my car started life as an auto also.
One thing I've found, the earlier trans cases are less likely to be cracked around the oil drain, the later case alloy was stiffer but more likely to get cracked from over torqued drain.
Guy I bought mine from had 3 or more trans, all the later model trans had cracked drains, and the one I bought G45706, the drain was fine.
 

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The brittle cases were '90-'91 only, we replaced a few under warranty. There's a Service Bulletin detailing exact VIN and/or transmission numbers affected.
 

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18-22 lb ft on an M14 should never crack a transmission, either direction. And, at least for me, it never has. But you you those Jiffy Lube people who would rather put another 10 or 20 on it to stop leaks because they don't have the right sealing washer or are too cheap to use it or whatever. Actually, to be fair, it's probably NOT Jiffy Lube but lazy owners etc. My '85 came to me with a cracked case, so now I just never remove the drain.

 

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I agree, it is never a problem once I get them out the 1st time, it is "johnny overtorque" who has been there before me that I worried about. I've never had a plug back out, but if I was worried about it, I would do like they do on aircraft and drill the head and safetywire it.
While your fix does solve the problem, it also lowers the drain a bit making it a little more susceptible to a hit, damned if you do, damned if you don't.
I installed the 1/4 turn FOMOTO valves on my trucks to keep those "pit pros" from cracking the sump on my diesels. They all drained from the side, so didn't stick down.
The one on my "new" transmission had be hit and rounded off a bit, Got a new one to replace it. No sense fighting with the old one.
Trans drain was also in tight, but got it out as well.
 

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Discussion Starter · #14 ·
The FSM has the key to decoding the G or GM number... should be in the stickies in the c900 forum. In this case, the fact that it's a G and not a GM means pre '86, so that's small drivers/pinion/synchros. Of course, 30 years later, it's impossible to know what parts may have been swapped or changed or replaced, but in my experience when it comes to c900 transmissions most people just find one that works and put it in.
do you have a direct link to this content by chance?
 

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Service manual in the sticky's at the top of the forum. Some of the links no longer work, but if you try them all you'll find the ones that work.
My car had 1985 ML drivetrain dropped in, it has a the correct GM45608 trans under it. SO GM started at least in 1985, it may indicate large inner drivers.
It really doesn't matter, parts for these 30+ year old cars are getting hard to find, so you find what is good and use it, rather than look for the latest and greatest, or at least I do.
My G45706 will be going in this winter. If I can find the parts to fix the GM45608 I will, but a useable car is more important than driver size or internal centering at least to me. (to be clear, I am not saying the GM45608 has internal centering, just I wouldn't pass on a good older model looking for the last model put in the 900's)
 
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