Finally got the 67 Satellite up and running. I ordered a new kickdown cable setup because I dont have the linkage for it. I wanted to take it for a shakedown in the meantime so I tied the kickdown arm about 3/4 of the way back. Part throttle as the RPMS come up the trans starts to slip pretty bad. This is at slow speeds going around the block. I had the trans which had unknown history rebuilt at a local rebuilder but it sat probably 2 years between being rebuilt and actually in the car and running. Any easy stuff I can check in regards to the slipping?