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Hi Jordan, My name is***** will be glad to try to help. With someone under the truck move the shifter with the brake on for safety to see if the shift lever is moving on the transmission. If not take a close look at the linkage and shift cable that it is either broken or became disconnected. Let me know
Thanks for the update, Check for burnt and discolored oil indicating internal problems. Also check the filter and bottom of the transmission pan for metal.friction material and debris.
If this was present only immediately after the reflash then the problem is very likely related to the software issues unless there is a harness or module problem. Are there any fault codes or communication troubles with the modules?
Possibility of a faulty speed sensor since you are having speedo problems and this is related to the proper shift points etc. TCM and ECM read speed signal
Let me know
Thanks for the update. That is actually the procedure that will uncover an ECM that has internal hardware problems if it will not take a successful reflash. The ECM and TCM need to communicate, Did you replace the ECM yet?
Sounds like the ECM due to an incomplete reflash is not communicating all the Data between the TCM and is what is causing your problems unfortunately
The two modules need to pass information between each other for engine speed, road speed, gear position, etc
Can you get ahold of a test ECM from a salvage yard?