4L65E converted to 4L70E
11-26-2014, 08:40 PM
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4L65E converted to 4L70E Need a little help here guys... I recently just had a 4L65E rebuilt to go behind a crate LS3. Well little did I now that the transmission will need to be converted to use a internal speed sensor which is a 15pin rather than the standard 13 pin my current transmission is. I just would like to verify that this IS possible or if I should just bite the bullet and look for a different(newer) transmission. I have already been talking with my transmission guy and he assured me that this is able to be fixed with what I currently have. Any help would be great. Thanks!
11-26-2014, 10:46 PM
#2
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To convert from non-ISS to ISS (Input Speed Sensor), you will need a new pump and a new input drum (really just the input shaft, but they are attached). Also the ISS sensor/harness on the pump and the internal harness that connects to the ISS and has the 15 pin connector.
I don't know if the newest TCM will support pre-'09 transmission that still have the 3-2 downshift solenoid and the pressure manifold switch. The '09+ 4L70E has a different valve body without the 3-2 downshift solenoid and the pressure manifold switch is replaced with a physical switch on the internal part of the shift shaft. The connector has has a very different pinout.
I don't know if the newest TCM will support pre-'09 transmission that still have the 3-2 downshift solenoid and the pressure manifold switch. The '09+ 4L70E has a different valve body without the 3-2 downshift solenoid and the pressure manifold switch is replaced with a physical switch on the internal part of the shift shaft. The connector has has a very different pinout.