NW-99SS Posted July 11, 2013 Report Share Posted July 11, 2013 So my trans just suddenly started acting up. At first I noticed it attempt to shift down while going 70% throttle up a high and quickly free rev to the limiter. A little uneasy, I try a few different things and note the following: When manually shifting 1 - 2 at light load <30% throttle, rpms hold at 1st gear range for at least 1 second, then shifts to 2nd. 2 - 3, same scenario, engines free revs until I back out of the throttle, then shifts to 3rd. 3 - 4, same scenario, hard, solid shift into gear. Next scenario, get truck into 3rd, apply progressively more throttle, from 30% up to 80%, at around 4500rpm, trans lets go of 3rd or tries to downshift into 2nd and freely revs engine, immediate back out of throttle. Hoping its something simply like solenoids, truck still pulls well in 1st but haven't tried WOT since it began acting up. Might be looking for a new 4L80E Quote Link to comment Share on other sites More sharing options...
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