GM SM465 Transmission Spline Shaft
GM and CHEVY SM465 4 SPEEDS 1968 and UP:
The SM465 is a robust, heavy-duty manual transmission known for its durability and reliability in various applications, including trucks and off-road vehicles. It features a case length of 12 inches, making it relatively compact for its strength. The casting numbers on the case-GM465452, 6273212, or 3901127-are crucial for proper identification. Additionally, the top shift cover should have the casting number GM3901131.
The P.T.O. opening is available on both sides of the main case. This allows for versatile configurations depending on your specific needs, whether it's for agricultural equipment or other machinery requiring auxiliary power. This transmission has a non-synchro first gear, with the gear ratios as follows:
- First Gear 6.46
- Second Gear 3.58
- Third Gear 1.70
- Fourth Gear Direct
- Reverse 6.09
Installation Tips:
We highly recommend using a manual transmission shop for installing the output shaft in the transmission.
If you attempt the installation on the SM465 shaft on your own, please be careful with the sleeves as they are a press fit and can shatter during installation. The sleeves are a very close tolerance. Heating the sleeves in an oven at 250 degrees Fahrenheit for about 10 minutes can expand them slightly, making installation easier. (Be sure to use eye and face protection when pressing, and leather gloves when handling the heated bushing.)
You will need to retain the stock rear bearing, thrust washer and locking nut from your old output shaft. On GM 2WD transmissions, a new washer and nut must be purchased from a transmission shop if the original ones are old or damaged.
This output shaft is a universal length, it may require to be shorted depending on the adapter casting that you are using. If used with an Atlas transfer case please refer to the input section of the Atlas manual to verify the stick out length. Do not force the transmission and transfer case together.
The SM465 stands out as a dependable choice for those needing a transmission that can handle tough conditions and heavy loads. Its strong cast iron construction and versatile features, including dual P.T.O. openings and non-synchro first gear, make it well-suited for a variety of applications. Regular maintenance, careful installation and proper identification of casting numbers will ensure optimal performance and longevity for those looking to enhance their vehicle's drivetrain.
Bill Of Materials
