Have Transmission Questions? Ask a Mechanic for Answers ASAP
If certain these components worked before replacement, first and obviously check connections, if okay, remove connector on Allison transmission, and look for pushed out pins/ then bent pins on transmission bulkhead.
if both okay, there is likely a problem wih the transmission internally such as a speedo ring, or not connected/ tr sensor internally.
please let me know if I can help further.