honda accord lx 90 shift D4 D3 car very slow to pick up speed?

i think is the speed sensor??thank you
my honda accord lx 90 automatic... shifted D4,D3 car very slow to pick up speed,..R,1st,2nd gear is good..we try in the freeway the car is not shifting.. it feels like its already on 4th gear, i know my transmission is ok..it happen after we install the head gasket..
 
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