![]() ![]() If too loose or too tight, a problem is indicated. Using either method, the desired outcome will be about 0.020″ to 0.030″, which indicates the stackup is correct. ![]() A dial indicator or feeler gauge can now be used to check the bench endplay ( F igures 5 & 6). Position the complete assembly with the sun shell face down on the workbench. Set up all the planetary components and bearings onto the output shaft in their correct position and order, then install the snap ring inside the front planet to retain the components on the shaft. It is easy to verify correct assembly on a 4L60E prior to installing the components in the case. The devil is in these details, and he’ll ruin your day if you let him. Note that some of the dimensions match from carrier to carrier, while others do not ( Figure 4). This is a very common issue, and inspecting/measuring the components prior to installation is an important step to prevent it. No problems will arise as long as all three components are matched as a set, but if the different designs are mixed, incorrect endplay will result and the output shaft snap ring will not install properly. Many builders don’t appreciate that these revisions include both the four- and five-pinion carrier designs ( Figure 4). The reaction carrier bearing was upgraded to a thicker design, and the reaction carrier and shaft were changed to accommodate the new bearing ( Figures 2 & 3). Some parts will interchange while others will not, and installing incorrect components often leads to the creation of other problems, such as the one mentioned above.Ī good example of this is the design update that GM made in March 2007. The late-production 4L60E family of transmissions has undergone a number of component updates and changes. Keep in mind that replacement parts are not all the same, even though they may seem to fit. The technician tears the unit back down to inspect for an (assumed) assembly problem, but cannot seem to figure out why the stack-up is not working. During assembly of the transmission, the technician has difficulty installing the output shaft snap ring ( Figure 1), or while checking the input shaft endplay finds that it is too tight or too loose (spec is 0.005″ to 0. Let’s take a look at a common 4L60/65/70E scenario. ![]()
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