Need help with my transmission problem on my G35 sedan

Bentee10

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My name is Benjamin I need help diagnosing what the problem is it's going code 1754 all I know is it won't shift into 4th and 5th gear I changed all the fluids put a new filter in it tranny filter that is shifts fine reverse first second and third are good also when I engage The slap shifter it has 4 m like it's starting in 4th gear at a standstill
 
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