I have a problem with 4th gear or overdrive. I have a strong1,2,3 but when I got to overdrive it feels like it still in third but if I don't give it gas while its in 3rd apperently its in 4th because if u shift down from 4th to third u feel it shift down but u don't feel it shift when u shift from 3 to 4.

 

If your car has a tach, take a look at the RPM. The RPM should drop as you shift to a higher gear. If the revs go up, then something is slipping.

 

sounds like its not locking up in 4th. what year. check your trans wiring underneath and make sure there not damaged.

 

You should be able to feel 1-2-3-4, those are defined gears. Once in 4th, the torque converter locks up and you might feel it, you might not. I never could notice or feel a difference in lockup with mine, and i really doubt that's what you're not feeling. Shift speed and firmness is related to your gas pedal (throttle) position, so it's quite possible you're not feeling the gentler 3-4 shift because you're not "getting on it" at that point like you may be when it's shifting 1-2-3.