transmission

I have 2000 pontiac gran prix and the transmission didn't slip at all but today i was driving it and was goin down a hill went to step on the gas and all it did was rev the rpms couldn't get it to go into any gear got told i need new transmission is there anything i can try before goin that route

Check the fluid, and maybe do a flush. Has it ever been done before?

Just bought car 4months ago not sure has high mileage also should i change filter and do flush not really automotive smart can do things just don't know how to out the problem

Well be very carefully with it those tranys are junk and little abuse will mess them up how many miles are on it? Any power adder? Is it the 65e or 60 (gt or GTP)

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Power fine and its a gt 210000

Dang they normally start doing what your talking about at around 160 its been babied that's a good sign.. honestly I would just recommend babying it as much as you can .. not so sure a flush will help the slip

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It hasn't slipped it just stopped all together and none of the gears will work

Drop the trans pan and clean it out. Look for metal shavings and such. I it is not too bad, replace the filter, clean down the evalve body with brake clean and then bolt the pan back up. When filling the trans use 1 qt. of Lucas trans fix then fill with trans fluid that is called for on the dip stick. Warm up the vehicle and drive. Good luck