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: tranny speed sensor question. kimagine 09-06-2005, 11:42 PM Just an off the wall question, What kind of symtoms would the 4l80e tranny speed sensors cause if they were going bad but not throwing any codes? Thanks ahead. Mark Mike L. 09-07-2005, 11:30 AM Just an off the wall question, What kind of symtoms would the 4l80e tranny speed sensors cause if they were going bad but not throwing any codes? Thanks ahead. Mark Mark You would have shifting issues big time. You can watch the speed sensors on a data stream with a scanner. What you will be concerned with while youare watching is 3rd gear. Both sensors should be reading the same numbers. mike kimagine 09-07-2005, 08:32 PM Thanks Mike, What would one be looking for when one does not have access to a scanner of that sort. My issues have been intermittent and 3rd and OD were showing the most symptoms of slippage and over-revving and occasionally hard shifting. I have ordered both sensors and will change them out this weekend. They were inexpensive and hopefully will cure the problem(praying it is not a re-build issue). It only happens once in a while, but not like the TPS problem of last year which I changed out and it remidied that. Thanks again, Mark | ||