It only slips when l have been driving for about 10 min. and once it start slipping the RPM on my car goes up but the car doesnt speed up so im asking wut should l do cause l really cant afford a new trans.

The transmission needs rebuilt or go to a ''pull your own part'' junkyard, get one and replace it.

unfortunatly there isnt anything u can do aside from having it rebuilt (which does not always have good longterm results) or replace it either with a new one (recommnded depending on the vehicle, or one out of a junkyard (not recommended as u will not know its ondition until after it has been installed in ur vehicle. If u bring it to a transmission facility, they may recommend flushing saying that the TP l sensor is stuck due to small particles & buildup, DO NOT ok this, this will most likely cause the tranny to blow completely as if one of ur problems is the tpi sensor, then the sludge is whats actually keeping it working. good luck

l would check the transmission fluid level first, and if it is low, put some in, but if it still slips it will need to get serviced.