Ram Transmission is shifting "different" pattern?

My 99 Ram 1500 automatic transmission is shifting "different" now. Seems to change gears at different speeds than it used to.. In other words, if it used to go 1st to 2nd at 25mph, now its at 35mph (not actually, but trying to explain..) . It seems the speed has to be faster than before for it to shift to the next gear ratio. And at lower speeds, it seems to stay in 1st or 2nd MUCH longer, and if I lift my foot from the accelerator, it is almost like driving a stick shift, kinda slows the engine down cause it does not shift. Any ideas whats wrong? Thanks in advance for any help!

mine used to drag like that then stuck in first gear and wouldn't shift. Found to replace the speed sensor on the yoke of the tranny.

my 2000 started doing the same thing AFTER i got larger tires...went from 265/75/16 to 285/75/16 and the shift pattern seemed off...took it in, local shop said the computer needed reset to the larger tire size, take it to the dealer..so i did, they reset it for the speedo change (which was insignificant to me, nor did i care about that) and i got to talking to the mechanic who informed me that basically he sees this all the time with larger tires: the tranny/rearend are geared for the factory sized tires, when you put larger ones on, it throws off the "ratio" and causes the shift pattern to go up, it also wont go into overdrive when it should, and he said this will/can eventually KILL the tranny..i asked what to do?? he said nothing short of changing out the gears, going from say a 410 to a 390 would fix it.....i find this VERY hard to believe...has anyone else ever heard of this???

Changing the gears does not seem right at all. Maybe he's looking for some side work. :naughty:

i dont think it sounds right either...think about it...how many guys do you know who put bigger tires on their trucks with the factory tranny/rearend setup?? do they have problems like this with shift patterns being off?