Addition Kit Information:
In the 4L60E/65E/70E-700R4 type transmission the 3-4 clutch is contained in the input drum. The clutch is applied when hydraulic fluid moves the 3-4 piston
causing the 3-4 apply ring to engage the clutch. Over the years all these parts have been updated by General Motors. In an automatic
transmission it has been proven if you increase the number of frictions in a clutch set up you can increase the torque handling capability
of that particular clutch. One issue with this theory, to increase the number of frictions the steels must be thinner to get proper clearance.
The 3-4 clutch in this transmission does not work well with thin steels because it is a shifting clutch and the thin
steels have an inability to dissipate heat causing the steels to warp, especially in high performance applications. General Motors went from a
five friction setup in 1982 to a seven friction set up with six .097" thick steels in the later model 4L65/70E heavy duty transmissions. However,
in the standard 700R4/4L60E transmission up to 2010 model year GM used a six friction setup. This Trutech Performance Module contains the Raybestos
Stage One seven friction, six .097" thick steel clutch components. To install this clutch correctly we have included all the additional factory
parts necessary to achieve proper clutch clearance. All OEM parts included in our Overhaul Module are high quality and meet or exceed factory
At Trutech Performance Transmission we have found the Raybestos Blue Plate frictions to be an excellent high performance friction. When using
a high performance low slip friction it is necessary to calibrate the shift times to engage the shifting clutches quickly. Because this is
necessary we highly recommend one of our shift modules.
To ensure hydraulic intregrity our Overhaul Module contains the updated steel molded 3-4 pistons. There are two check valves that are very
important to 3-4 clutch life. These check valves are the 3-4 exhaust check valve in the input drum and the 3rd accumulator check valve. Both
these valves have a direct effect on 3-4 clutch operation. We include these check valves in all our kits, we consider this low cost
In this General Motors transmission bushings play a large part in hydraulic intregrity. In a lot of rebuilds, the bushings are not replaced
if they "look" good. Our recommendation is replace all bushings in your Overhaul. In the 4L60E/65E/70E type transmission the band is applied to move
the vehicle forward in the 2nd and 4th gear range. In our High Performance Build Modules we use the Alto extra wide carbon band with heavy
When using this extra wide band we strongly recommend replacing the reverse input drum to give the band a new wear surface. However, the drum
can be reused if it has no signs of wear. Replacing the drum is always a good idea but not always necessary when using the stock width band.
Do not reuse the drum if it is discolored from heat or is warped in the band apply area.