13 speed issue.

Edited:

I bought a Truck a while back 9 speed original converted it to a 13speed via lines and shifter head. After I split around and come up and push the red button forward it sticks won’t shift until you jerk the fuel pedal a little.
if I put it in neutral put the high low up and then flip the red button forward. You can’t hear the trans doing anything but as I type this I’m driving it around and getting it to half split up and down in some gears
Trans is a rtoc- 16909A
thoughts?

 

Nah it’s the 909a and 913a

 

It is a rtoc sorry didn’t see that I missed it

 

Edited the original post.

Just drove the truck around a little more playing with the shifter. I was able to get other gears to upshift and down but not after I go from lo to hi then pre select red button it lags I gotta jerk the fuelpedal a little eventually kicks in

sticking?