I took my car for its first real highway drive last weekend, taken it for some short 40km trips round trip, so I decided to take it to edmonton about 350km round trip, on my way to edmonton I made it about 60km there travelling about 75 mph, when the car felt like it down shifted, (guessing loss of tranny pressure) I pulled over to the side of the road and you could see the tranny fluid running out of the pan gasket. I towed the car back to my garage and fixed the pan gasket. Now when I drive the car it will not shift into 3rd gear( it did shift into 3rd once in about 5 drives), I have not changed anything except the gasket, I do not have a kick down cable hooked up, tranny has less than 200km on it since rebuild. I would take it in to where it was rebuilt but the weather here has been rain and snow all week. Any ideas would be appreciated

68 fastback, 289 C-4auto

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Strongly advice you take it the guys who rebuilt it. Even if it means having it towed in.
They can make what ever adjustments are necessary, and you don't have to worry about ruining your warranty. Might be as simple as the vacuum line came off, or a possible internal problem.
The C4 is a very good and simple transmission. I'm sure it won't take them long to figure out what happened.

Good luck,

 

Scott is right. I was going to suggest modulator.