Any ideal why my tranny cuts in and out if I cruise between 45-55 mph?

 

What do you mean by cuts in and out?

 

The RPM' s will jump up and down like crazy until I speed up then it stops

 

sounds like you need a new sensor.. there is one hiding out under the pan that engages the torque converter lock-up function.. me bets that is your huckleberry..

 

i have to second the sensor, I wouldn't drive too much with it like that, you might damage the overdrive gear... (assuming you have O/D)....

Any DTCs?

 

That sounds about my luck guess ill start there

 

Auto or stick? I found a sensor at ROCKAUTO.com
they are much cheaper than parts stores or dealerships with the same brand.

 

Yes I do I've been planning on putting the HD tourqe converter in very soon anyways

 

It's auto

 

Get you the cheap sensor at Rockauto or where ever you choose and let us know how that goes.



http://www.rockauto.com/catalog/raframecatalog.php?ck[viewcurrency]=USD&ck[ID]=a1a428171d67ff8beb26626c536f9e83&ck[idlist]=a1a428171d67ff8beb26626c536f9e83


Heck in this link the part they are already talking about is in the shopping cart, with a discount that they sent me.