The General Motors 4L60E is a 4 speed automatic transmission with overdrive and torque convertor. The 4L60E transmission was the electronic transmission that replaced the GM Turbo Hydromatic 700R4. It fully replaced the 700R4 by 1993 for trucks, SUV's and vans and in 1994 for rear wheel passenger cars. It is essentially the same transmission as a GM 700R4 but adds the electronics.
The TH 700R4 was renamed the 4L60 and by 1992 it became electronically controlled with a Vehicle Speed Sensor (VSS) and was renamed the 4L60E. Though not mechanically similar, it is a descendant of the original Turbo-Hydromatic transmission from GM and Buick in the 1930's.
The oil pan has a rectangle shape with it longer than it is wide. The oil pan and gasket to the housing are a 16 bolt pattern. 3 bolts front and rear and 5 on either side of the oil pan.
The following are example clips from the "4L60E Automatic Transmission Rebuilding" video
Click the thumbnail images on the right of the player to select a video.
Before you get started rebuilding your transmission, you'll need a few parts and tools. You'll need the appropriate transmission rebuild kit for your 4L60E. Depending on what type of kit you buy, it should come with at least new steels and frictions. Usually included are all the bands, clutches, seals, sealing rings, gaskets and a filter and drain plug. Most higher end rebuild kits will include a new shift kit as well. An automatic transmission shift kit is only needed if you want the gears to shift sooner, but it can also reduce transmission wear by reducing or eliminating shift overlap. The better kits will also include new valves and valve springs for the valve body.
A transmission repair manual is a must. We recommend one for your specific model from ATSG (Automatic Transmission Service Group). Every automatic transmission will need a universal clutch spring compressor as well as snap ring pliers and pic sets for removing valve guides.
Of course you will need to remove the transmission from the motor and chassis. If you're not familiar with this, the first part of the BoxWrench 'Basic Engine Building' video covers this. All of the automatic transmission rebuilding video's out there start off with the transmission already out. So be aware if you aren't familiar with removing the transmission. You will also need a good work space and transmission stand. It's best to have it able to rotate around for removing and installing components.
As you disassemble your transmission, make note of any obvious wear to parts that may need replacing. Keep the internal parts in the order they were removed to keep track of everything. Most of your worn out pieces like frictions & steels should come in your rebuild kit.