Good day pals.
My car is a honda accord 2001 4cyl.
I recently changed my transmission with a used one, but on the new one, the countershaft speed sensor and mainshaft sensor had three pins while the ones on my old transmission had 2 pins. The mech guy had to transfer the sensors from the old one to the new gearbox.

I then noticed that while driving, the transmission upshifts well, but when I slow down, it seems it doesn't downshift to 1, therefore the car will move slowly and gradually speed up no matter how I step on it. This is worse when going uphill.

I also noticed that if I step down to accelerate fast, the car normally downshifts to pick speed, but there is an abnormal 3-4 seconds of drag b4 it downshifts and picks speed.
No blinking D4 and no code on scanning.

Could this be because of the swapped sensors? Or is the gearbox bad?

Oil is DW-1


Please I need advice. Thanks

 

What speed are you at when it does not DS to 1st?

 

The only time it downshifts to one is when I slow down to a halt and stand for some seconds-minutes. if I stop and try to move off immediately, it will push off slowly (gear 2). I noticed it downshifts faster when the engine is cold at which point I don't have to stop b4 it downshifts but it's still markedly delayed.