Definitely check the connection on the TC. It would also be worthwhile to pull the sensor out and inspect the speedo gear. If you recently had tranny work done, they may have chipped some teeth on the speedo gear. It's only plastic. If you can't find the problem and you think your actual speedo is broken, I have my old one from when I did the guage cluster swap. It has about 175K miles on it and worked fine, but there's no trip meter. (PM me if you or anyone else is interested-I have the complete guage assembly with idiot lights or if you just want the speedo). I would bet the speedo isn't getting a signal though.
'00 TJ Sahara (RC 4" LA kit)
'06 Grand Cherokee Limited
'07 Ram 1500 quad cab
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