hi guy I'm a new member an i have a 99 mazda 626, it has the check engine light on with a p1744 code torque clutch selenoid circuit, the speedometer starts shaking sometimes, and today the o/d starts flashing in the freeway at 80 miles.

I heard, if the speedometer doesn't work good can cause problems with the transmission and also make the o/d flashing, can somebody help me with this

 

oh right, i had a broken transfluid-line very bad, i replaced and filled the trans and the o/d light stopped flashing, the check engine still on and the speedo shakes sometimes, and it makes the first shift hard and out of time