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4L80E Erratic Shift, Speedo Bounce, ABS Light On
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Question
lute
'96 C3500 454 2WD with 4L80E.
Intermittent problem with trans/speedo. Speedo starts bouncing at about 40mph and trans shifts up and down.
Had a similar problem 18 months ago due to low voltage at trans fuse. Replaced the ignition switch and problem solved. This time voltage was normal but replaced the ignition switch again anyway. Didn't help.
Then replaced input/output sensors and throttle position sensor. No change. Checked VSS ground at manifold.
Over the past few weeks problem has gone from very intermittent (every few days) to somewhat regular. ABS light is on, checked wheel sensors and they are good.
Don't want to detonate my trans. What should I look for next?
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