But over the last few decades and as automatic transmission technology has improved, the manual transmission has lost popularity. Only a very small number of vehicles produced today are still offered with a manual transmission and that number will only get smaller as vehicles move to electrification. Manual Transmission operation. Traditional Automatic Transmission The most common type of transmission that is available in vehicles today is the automatic transmission. Related Articles. Previous Post Next Post.
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Most transmissions will have a "source serial number" chassis vin usually found close to the transmission code. This number will contain division ID , model year, assembly plant and production sequence last 6 digits of the VIN stamped onto the transmission.
Example: 19N Location of source serial number On the THM, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission. On the THMR4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing.
From on, the ID number contained the transmission type or plant prefix, Date coded below and a shift code. The constants in decoding the trans ID number are the date the transmission was produced.
Modern 6-speeds are easy to spot, and 5-speeds are not difficult either, but when it comes to older 4-speeds and automatics, the increased variety can muddy the waters. So, whether you are heading out to check out a "For Sale" ad that could be your next project or trying to make heads or tails of a junkyard find, the following charts can be useful guides when it comes to GM transmission identification.
The easiest method of GM automatic transmission identification is to examine the transmission pan. New transmission designs came with new, unique pan shapes, and the general shape of the pan often paints a fairly clear picture of which automatic transmission you are dealing with. Once you identify the pan, count the number of transmission pan bolts for confirmation.
Here's a quick overview of the first model year for each transmission. Although they are no longer offered on new vehicles, rebuilt and aftermarket versions are still available for each of these models. You can find replacement parts for each of these transmissions here:.
As mentioned above, modern 5-speed and 6-speed manual transmissions are easy to identify, but older 4-speed transmissions have more variety.
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