Have a 98 gmc put old school carb and choke motor back in it but the electric transmission won't shift

SOURCE: carb choke

yes ground and hot
youur hot wire needs to hook into ignition circuit so it is hot with key on

SOURCE: GMC 1500 Auto, will not shift back into park?

Climb under your pickup and look where the cable connects to the side of the transmission and make sure there is not any mud around the cable or around the shift linkage hookup. If so clean it off and see if it will shift. We have found many of these with mud caked around the shift linkage or a lot of ice buildup and wont allow it to shift into park.

SOURCE: What can cause my 98 olds intrigue to shift

your torque converter maybe to blame here. a simple fluid pressure test will tell you that. if the pressure is good, your valve bod might be due for a change.

SOURCE: transmission will shift, but car won't move.

there is a linkage inside the transmission that came off or lose so you might have to take it to a mechanic to get in there and repair so do not start car no more and you might have to have the car towed to a mechanic to look at it.

SOURCE: Replaced motor in 98 toyota tacoma prerunner 2.7 l put it back together and now it won't shift into gear. Can you help please

Do you have the torque convertor bolted to the flex plate? I hope you made sure the convertor was fully seated on the input shaft before dropping in the engine. After the engine and trans. was bolted together, did you have a gap between the convertor and flex plate, or were they pressed together? If there was no gap, and the conv. and flex pressing against each other and you started the truck, you probably just ate up the trans.oil pump drive tangs and the convertor itself too.