Kicking in and out of overdrive

[doyle95]

Ey everybody well the title pretty much says it all ill be cruising down the road and it will be in fourth and about the time it should be shifting into over drive it doesn't and then if you blip the throttle it will shift into o/d and then immediately kick back to fourth anyideas I was thinking maybe its my tc but its only been actin up since I did the efuel on my truck so Idk Wtf lol thanks for your help guys

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[toad]

Fourth is OD.

[doyle95]

Well it kicks in and out I don't think my torque converters locking because if I step on it at 70 it still kicks in and out of gear

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[madpogue]

That's probably the torque converter _un_locking. Check all your brake lights, including the one in the cab roof.

Have you noticed, by any chance, if the cruise control kicks out at the same time?

[kramarj]

Have you installed any LED tail lights recently? Those will do it too.

[doyle95]

It actually ended up being the fuse lol Idk Wtf happened to it though