Transmission doesnt shift abs & brake light on speedometer doesnt work

It all depends on what kind of vehicle you are talking about. You must post the generals of the vehicle

My ABS and Brake light goes on alot. Also sometimes my gages will go up and down for no reason. That is what they call the GM shuffel. It happens to alot of GM vehicles.
I never had a problem with loosing power or the tranny stuck in second gear. Sounds electrical, if no one can help here, get that thing to a garage before your hurt.

Fuse # 20 or 21 gets power through ignition. This fuse controls PRNDL indicator, speedometer, tach, & will cause transmission to not shift gears correctly. Ours took off in 3rd gear when put in Overdrive & only ran in 3rd gear. If we tried to manually shift thru gears (auto trans), it had 1st, 3rd, reverse. No 2nd or over drive. Replaced ignition. Fixed problem. Root problem was Electric motor that engaged 4 wheel low side was bad. Every time we used 4 Low side it threw power surge through ignition & blew ignition out. Good Luck.

Is the break pedal stiff? with the ABS light on and the break light on sounds like your breaks might be locked or locking up which could be why the transmission isn't shifting

SPEEDOMETER TROUBLESHOOTING

Can be loose speedo wiring connectors under instrument panel or its issue with speed sensor on transmission.

I suggest you to go through help links mentioned below with appropriate solutions to confirm the problem :------

How to trouble shoot speedometer?

http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html

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1996 fiat bravo speedometer not working?

http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
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Speedometer works but odometer not working?

http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html

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Speedometer runs backward?

http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html

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Warning lights on and speedometer died?

http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.ht

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Speedometer not working on 1993 Ford F350?

http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html

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ABS & Brake lights warning indicator steady on dash and speedometer not working for Dodge Ram?

http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html

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Vehicles Cluster panel Not reading Miles?

http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html

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Odometer works properly but speedometer works intermittently?

http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html

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These will help.

Thanks.

Check fuses. The speedometer works off electronic signals, it is common for several indicators, like the brake light and abs signal to work off the same fuse. Check your owners manual for fuse panel location and fuse identification. Don't be surprised if you experience strange transmission shifting while this fuse is out as well. Without the speedometer signal the transmission doesn't know when to shift properly.

Follow the speedometer cable from the firewall, down to the transmission. It should bolt in the transmission, remove the cable from the transmission, and turn the gear to check to see if speedometer is working, if not, it's most like the speedometer head unit.

Change the speed sensor in the top of the rear differential

sounds like your vehicle speed sensor is going out. it's the modern equivilent of a speedometer cable. it tells the computer how fast your going which the computer uses to determine shift points, abs function, and speedometer readings. they usually act up a bit before they go out. it confuses the computer. normally located in the extension housing at the rear of the transmission where the spedometer cable would be on an older vehicle

Rear Sensor replacement 44.95 retail
Shop Labor 60.00
This will fix the ABS and Brake lights, will fix the speedometer isue and smooth out the erratic shifting.