My 99 chevy tahoe transmission will not shift into any gear. i checked the fluid and is fine. I did just change out my flexplate. Everything that is suppose to be hooked up, is hooked up. Im lost at what the problem can be. Any solutions?

check fluid level and condition ---have scanned for any trouble codes -----can be anything from tcm --to 4wd problems need to have diagnosed not just guess about a part

I put my truck into drive or reverse n it will not move at all ...

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CarGurusJan 27, 2014 - Alright well normally I can feel my truck shift into drive or reavers but it's not but .... running while won't move,I mean it moves but won't change gear,fluids good ... I have a 2002 Mercury Stabler Car starts up fine but will not move ... I hear a pop and my tahoe stops pulling and no reverse either it just revs up.

Chevy Tahoe Transmission Problems - Car Forums at Edmunds.com

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Dec 16, 2009 - 30 posts - ‎22 authors
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30 Common 4L60E Transmission Problems & Repair ...

fix shift solenoid b

For car not changing gears it can be shifter assembly issue, or it can also be transmission issue. Get the shifter assembly inspected with ignition OFF.

For more troubleshooting, I suggest you to get the Following help link checked, its complete step by step procedure to inspect gear shift issues: -----

GEAR SHIFT ISSUES

http://alltypesofpartsreplacing.blogspot.com/2012/11/gear-shift-issues.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html
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These will help.
Thanks.

make sure your transmission fluid level not low if fluid level okay. other possible causes for transmission wont shift out of second could have stuck or faulty first and second shift valve.code scan for faulty VSS SPEED SENSOR.

Sounds like the transmission is due for an overhaul. We just had one in a Chevy truck doing the same thing. Transmission was on the way out.

could be modulator

I would say you should re check if you have 2nd and 4th. If not you need to have the sun shell replaced in the transmission. this is a comon problem. I hope this helps.
Thank You,
Roy

Try servicing the tranny fluid if not changing the fluid, if the problem has existed too long it may be time for a new tranny.