NLazy

I was talked into buying my buddys 1998 gs300 for the wife must have recently did a transmission fluid change because the dip stick is red doesn't smell burnt eather. I replaced throttle body and censors, stI'll hates shifting into 4th esp when warm and going up hills. Have no code for the L except for an ABS code for the back rotors,think there warped...?it's not throwimg a code for my transmission..either so not sure exactly why it's slipping and having a hard time going up hills. Cld it possibly be a filter problem? Or should I get a transmission rebuild kit? Anyone else have similar problem? 200k miles on engine.

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