Code P2767, turbine speed sensor?

I'm still getting that code p2767. Fluid is right 180* at 70mm. Changed fluid and filter. Drives fine for a day or 2 then limp mold with the p2767 code. Is it possible that the rear end yoke with the play it has in it? Can that cause the sensor to send the wrong speed info? I didn't change all the fluid, just what was in the pan. Could that be what's kicking on the code. Because I remember before I was getting the incorrect gear ratio for gear 1and 2. Now it's just the one code p2767? With it going as long as it does before throwing the code made some dirt or debris is building up?