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4L60E/65/70E-700R4 Master Rebuild Kit Raybestos Blue Plate Level 4

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 of the inability to dissipate heat causing the steels to warp.
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 of the inability to dissipate heat causing the steels to warp. General Motors went from a five friction setup in 1982 to a seven friction set up with six thick steels in the later model 4L60E heavy duty transmissions. However, in the standard 4L60E transmission up to 2010 model year GM used a six friction setup. All Trutech/Procare Overhaul Modules contain the seven friction, six "thick" steel clutch components. To install this clutch correctly we have included all the additional factory and/or quality aftermarket parts necessary to achieve proper clutch clearance. One additional benefit to this Overhaul Module, we have included turbulator steels for low reverse and reverse input clutches. Turbulator steels are designed with holes strategically cut into the steel. The holes prevent a temporary fluid coupling in the reverse clutches that would cause the reverse and forward clutches to be engaged at the same time. All OEM parts included in our Overhaul Module are high quality and meet or exceed factory specification.
To ensure hydraulic integrity our Overhaul Module contains three updated steel molded input drum pistons. Because of changes to the overrun piston the overrun spring must be updated with the ACDelco spring included in the module. There is one check valves that are very important to 3-4 clutch life. This check valve is the 3rd accumulator check valve. This valve has a direct effect on 3-4 clutch operation. We include this check valve in all our kits, we consider this low cost insurance.
In this General Motors transmission bushings play a large part in hydraulic integrity. 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-700R4 type transmission the band is applied to move the vehicle forward in the 2nd and 4th gear range. There have been many improvements to this one component. In this High Performance Build Module we use the extra wide carbon band with heavy duty anchors. When using this extra wide band we strongly recommend replacing the reverse input drum to give the band a new wear surface. 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.