I put the car in gear this morning and the abs service vehicle and trac off light came on and won't go off I also fixed a small leak on the tranny

Have vehicle scanned for trouble code and may have a damaged abs sensor/ abs circuit or a hub failing

may be the fault codes still exist in your service system.
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Diagnose the ABS Braking System, based on the codes you have

The ABS and traction off lights usually indicate a bad wheel speed sensor. I can't remember if the service light came on the three times mine went. The most common one to fail is the left front.

Try this cheap fix first.

Remove the left front wheel speed sensor, clean and reinstall it. They are magnetic and some times road debris will block the sensor. If that was the problem the ABS and traction lights will go off when you start the car.

Your second option is to have the shop scan the vehicle trouble codes, usually this costs an hours labor.

Hope this helps

bad wiring to the wheel sensors which were indicated to be replaced by the ABS Brake Scan tool.

or

A faulty ABS Brake Module.

I just put in new fron pads in my 2000 buick century and the track off and the anti lock brake light and the service engine soon stays on

The steering wheel position, wheel speed sensors, and ABS systems are all used to provide traction control. You likely have a failure of one or more systems. Scan the ABS system and it will provide codes to help the diagnosis. Wheel speed sensors fail often, and it is likely one or more of these is contributing to the problem.

Look up above your brake pedal and you should see a switch that is connected to it. This switch controls your brakes and in some vehicles, is tied in to the safety system. Change this and see if your van goes into gear ($10 part)

YOU HAVE A PROBLEM WITH THE ABS SYSTEM.CAR SHOULD BE SAFE TO DRIVE YOU WILL NOT HAVE TRACTION CONTROL OR ABS BRAKING

I have this same problem and had it checked. It is the wheel sensor. Mine is the passenger front right wheel sensor. According to the mechanic I take it to the GrandAm's are known for this. The part is about $40.