1999 Tahoe 4 door tranny shifting problems

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Jaime Davila

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Help! I cut the catalytics and took the thermostat off first of all. This was 2 months ago, ran great! Now my problem is my transmission shifts 1st, 2nd, and when it gets to 3rd it feels like if in neutral. I replaced the tranny with a used one and still have the exact same problem. Could it be the rear o2 sensors causing this? Or was it the thermostat? Ive been trying everything, i am on budget and im almost ruined. I have no more money and still havent been able to fix the problem. I live in l.a. and alot of these tranny shops just want my money and they say just get another tranny. Could it be a sensor, or maybe a ripped cable or something please help me i love this truck!!!!!!!
 

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