So I'm driving down the road and as I hit between 45-55 mph I hear a short grinding noise, only for one second, like I'm going over a median(like ones with those little linesacross them.) I've been driving it this way for a while now. It's not getting worse but it is still happening. I love my truck and this has been my only complaint. Any idea of what this could be?

 

Does it sound/feel like more of a 'shudder'? If you cancel the OD does the problem go away?

 

Yes, to both questions.

 

Whats the mileage on the trans/truck? Last time the transwas serviced?..

Torque converter 'shudder' occurs generally when the unit locks the TCC (Torque Converter Clutch) at lower speed and/or during initial lock up, and usually is or noticed during moderate acceleration like entering the highway ect without kick down and torque application is reasonably high. High mileage units are affected more, and 'can' at times break the clutch loose or slip/shudder without a lot of power being put through the clutch/trans.. Sometimes servicing the unit will help with the condition as fluid over time/heat/mileage will break down the fluids viscosity with fluid shear, as well as loosing friction properties.. There are additiveslike 'shudder guard' that may help 'some' as would a service if its well overdue..

 

It's got 95000 and I have not serviced the transmission for the 2 1/2 years that I have owned the vehicle. So I will be taking it in and will have them check it out. I have a warranty good for another 6 months so hopefully that will take care of anything major. I just wanted to know if anyone else had this problem and what it may cost to fix. I also was concerned if it would affect towing this summer. Thanks for your help.

 

Service intervals are 30K for Normal Conditions...15K for Severe Duty....