1998 GMC Sonoma not driving over 25 MPH

Hdwebmaster

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I have a 1998 GMC Sonoma 4.2 and it does not go over 25 mph without extending the RPM on high. I cleaned the transmission pan and added Lucas transmission in it and it still not going. I checked the shift cable and it's shifting.
I don't know anything about cars so can someone please help me on this.
 


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