I just bought a 97 cummins with a 500hp rated torque converter recently installed. when i put truck in drive or reverse it jerks for a second. then when im driving around 40-50 it will go in overdrive and then the rpms will randomly go up for a quick second. They only go up about 200 really quick but it happens when going constant speed..doesnt seem like trans is slipping... Any ideas on the problems ????

 

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