Car will start fine, brakes work but once in drive or reverse will not move, think its the transmission. Car has 350k km.

It may just need servicing/adjusting.

Your reverse gear is actually first gear ... when you select reverse another 'cog' fits into the toothed wheels to change the direction of first gear ... to give you reverse...

It may be a sticky valve or just a bit of adjustment (workshop job..) that is required.

What you can try ..

Start the car ... move the lever through all the positions several times (foot on brake..). Keep your foot on the brake and then put it in reverse and rev the car. Hard!

Try doing it several times.

An auto transmission works on valves opening and closing. Reverse gear - in comparison with the forward gears - is seldom used. The reverse valve can 'stick'. Try forcing it to open ... frighten it ... but keep your foot on the brake...

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

www.cargurus.com > Questions > GMC > Sierra 1500

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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30 Common 4L60E Transmission Problems & Repair ...

Transmission may now be toast since you continued to drive it when maybe low on fluid or torque converter had failed. How long since last fluid and filter change? Ever?

Your problem is a bad CV axle and outer carrier bearing failure. The grinding is coming from brake rotor on that side due to the bearing failure. the brake rotor and bearing is causing the lock down. Do not attempt to drive or further damage will occur. Transmission is probably OK. Replace both sides (CV axels and Carrier bearings, 150,000 is time) Check brake components for damage and replace pads while you are there.

sounds like you have a brake pad hanging up your shoes probably need to have brake shoes checked and adjusted

Well..., then just sit in the driver's seat and make noises like as if you're really driving it (ha,ha)sorry,just needed to put a smile on your face. Anyways,when/IF transmission converter is emptied,it needs to refill fully as it makes mechanisms(valves,so on)work to make the car move;now that is IF it was drained from also there. If you drained the fluid from the transmission pan(drain plug),changed the filter PROPERLY INSTALLED,refilled 2 thirds while engine off then running safely in PARK (parking brake on)fill to recommended amount checking with dipstick ,while in the car with brake pedal on,put in drive-neutral-reverse to make transmission's mechanisms make operation until car starts making a movement, then it should be okay. Are you sure you didn't nock something out of place,like linkage for gear changes??. Does the car make any noises when shifting gears??make a clunk noise??does it try to move??;need to know more details for someone to understand and find problem.

You have a failed automatic transmission. You will need to remove and replace it or have it rebuilt.

I think you need to bring that thing to a transmission shop. it is a bit surprising that a 5 y'old car would have a bad trans but maybe a transmission shop can save it. GL

CLUTCH!

First thing is check your transmission fluid level. 2nd thing is, if you haven't changed filter & fluid in transmission in a while, spend the money & do it, or have it done.