Lately when have been driving on the highway i have had a problem and im not sure what it is. I will be just cruising along about 65 or so with the cruise control on and if i come to a hill of any kind the car will kind of jerk. The RPM's dont change just not sure if its transmission or what, hopefully not, but if anybody could help or give their opinion i would appreciate it.

 

I had a car (another brand I don't want to mention here!) that did that and it was the transmission. It would shift from OD to third and back and forth extremely rapidly while going up any kind of incline. I changed the filter and fluid and that fixed it. It shifted back and forth so quickly it didn't change RPM's, and the car vibrated like it was running over the reflector bumps on the highway. Hope this helps.

 

I have had the problem with it shifting rapidly between 3 and OD in a few cars already. 87 Buick Lesabre, and a 95 pontiac bonneville. In both cases the cars were taken in for a "Tune Up" and the problem went away. Now I can't remember what exactly was done in the "tune-up" but it worked. Maybe check the plugs.

 

I would put some TransX in it and drive it for about 500 miles and then change the fluid and filter.
I have used TransX to save many a trannys.