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4L60-E, 4L65-E and 4L70-E Versions Any versions (2wd or 4wd) and year of the HydraMatic transmission can be adapted to these transfer cases. There are no inherent advantages to the 2wd vs. 4wd transmission. We'll refer to all three versions as the 4L60-E from here going forward. These kits are for the hexagonal, six-bolt tailhousing 4L60-E, typically made starting in 1996. Some 1997 and earlier versions have a four-bolt pattern tailhousing and non-removable bellhousing. Click here for this kit.
Transmission Output Shaft Replacement Every kit comes with a new output shaft for the 4L60-E, whether for 2wd or 4wd transmissions. 2wd versions work equally well as 4wd versions. The Novak output shaft is of an alloy steel, precision splined and hardened for a superior interchange. This shaft connects the 4L60-E output directly to the existing 23 spline NP / NVG input shaft for the strongest combination available. Installation requires disassembly of the transmission main assembly, and we recommend the services of a transmission professional, though good work is within reach of the home mechanic. The basic installation is 3-4 hour bench job and may include simple gasket and seal replacements. Some choose this as the time for a more thorough master rebuild and update if necessary.
Transfer Case Input Gears The included transmission output shaft splines in directly into the OEM Jeep input gears, and transfer case disassembly is not typically required.
Vehicle Speed Sensor The Novak adapter assembly integrates the Vehicle Speed Sensor (VSS) necessary for the operation of the 4L60-E's computer. This greatly simplifies the installation process and eliminates the need for a transfer case range switch circuit and logic, making all GM 2wd and 4wd engines, transmissions and their PCM's great candidates for the installer. The Jeep speedometer cable or VSS can then be connected to the Jeep speedometer or gauge panel as per factory.