ZF 8 speed rpm goes up and down until warm?

1187 Views 5 Replies 5 Participants Last post by  Bennyb4200
Ever since I've bought the truck over 25k miles ago, my 2014 Ram 1500 rpm varies up and down until warm while in low rpm. As soon as the trans is warm it drives normal and have no issues. Never gets any worse but some days it really pisses me off. It seems like a tuning issue. Any info? I'd pay to have it disabled. I've tried to research this issue multiple times but have never seen anybody ask the same question. Don't believe it to be the torque converter because it seems like if it were bad, it wouldn't go away when warm. 140k miles on it currently. Again, has done it since I've bought it and never got worse or better.
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I have a 2014 ram that does the same thing put new torque converter in change megatronic sleeve o-rings I think that's what it was. An a tune up that was the first thing I did and now it's getting so bad I can't even handle driving it the truck actually jerks on the RPM bounce and it doesn't go away no more once it warms up motor. And some days it seems like it's could be the motor but then it could be the tranny just so hard to pinpoint what one's doing it
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