nrcgsx67

i have a 94 civic with 220000 miles would shift hard on cold days and when it first started up, now after driving it on a long trip the transmssion the car slip in and out of gear while accellerating then pop in to neutral. if a turn the car off for a while it will work then slip out of gear again. i check the fluid be for hand and it looks to be clean and no funny smells like burnt of clutch or disks, i am new to this site and am only asking for some help full advise, i read some older post about a shift, linear solenoid is this on the out side of the case or is it internal. would consider doing a manual swap but i alread have a project car cant afford 2 at the same time. thanks for you time