Is it mechanical or electrical
 

I am new to the site GUYS I WOULD APPRECIATE YOUR INPUT,

Its a 1993 j spec auto supra

recently did a Engine,transmission and diff conversion(from an aristo) on my supra

the transmission was working fine.. changed fluids and installed a transmission cooler.

Was working great for around 600Km

About 1 week later after driving hard it could only go foward and not reverse. I let the car cool overnight and bam it started back working.

A week later( about 80km put on ) now i can reverse but cant get fwd gear D,1, and L. its not engaging at all.

the fluids levels are fine and does not smell burnt.



IS IT MECHANICAL OR ELECTRICAL??

.

Please help me out