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Just brought home my 68' mustang coupe with a 289 that has a few performance upgrades home on friday and decided to see what it could do. I floored the throttle and revved the engine in first gear to about 3800 rpm and then took off shifting through 1 2 and d reaching a top speed of 85 mph. After, i did a gradual speed run on it using d and no heavy acceleration and reached 90. Upon turning onto the highway i noticed the tranny was acting funny and didnt like shifting into third. I pulled into a gas station in town and checked the fluid level and it was normal. When i left, i had no drive period, but i had 1, 2 and reverse. I brought the car home and started it up in the morning and noticed it had "morning sickness" in 1 and 2 but that went away in 5 minutes. Any ideas what could be going on here? I've heard it could be a vacuum problem or a sticky valve. I'm hoping it's nothing major. Can't really afford a tranny rebuild right now 