Where is the location of the speed sensor?

SOURCE: slight miss in engine, hard shift from 1st to 2nd long 2nd gear

Check both O2 sensor(s) and catalytic coverter.. P0420 means catalyst below threshold. Also check the sensor at the transmission and solenoid.

SOURCE: vehical stuck in limp mode

This only applies if you have an allison transmission, which based on the problem you are reporting I would guess that you do.

It sounds like your vehicle is stuck in limp mode. This is probably due to a bad NSBU switch(Neutral, saftey, back up) (if you have an allison transmission. Prior to 2002 the NSBU switches had a very poor seal which resulted in water intrusion into the NSBU switch causing corrosion. If the switch is corroded it is likley confusing your transmission. Unfortunatly you cannot repair the bad switch, it needs to be replaced. If you order one through Chevy it will cost around 200 dollars. I found one at merchant Automotive for 91 dollars. ( http://www.merchant-automotive.com/allisonnsbuswitch2001-2004.aspx ).

The switch is relativly easy to replace. the electrical connections are the hardest part as they are glued into the switch. A little heat from a butane torch should soften it up and make the connectors slide off more easily. Other wise you may have to break the NSBU switch appart to remove the connectors.

I replaced the switch for the first time and it took me 15 minutes.

SOURCE: 2006 Malibu Maxx ss hard shifting/Check engine light

There is no dip stick. Its most likely not the fluid. These malibu's use the first generation GM LAN system. Check the data cord comming from the transmission near the mechanical shifting linkage. Alot of these shifting issues and errors are from a break in the wiring causing bad data to be sent/rvcd to/from the computer control module- these cars are electronically controled shifted, not mechanical.

SOURCE: 2006 Chevy HHR Traction Control Light and Check engine

i fixed mine by pulling each and every fuse in all the fuse boxes and replacing them with new ones. the hhr fuses have a tendency to work loose and cause all kinds of little problems. i searched the forums for the answer to the traction control light problem and never found an answer that worked until i talked to a "shade tree" mechanic in my area and he told me to do the fuse thing. been a month now and no more problems.

Testimonial: "The comments I left are the solution. The fuse thing does not do anything. It's a red herring. I replaced only the one that's associated with P0010 and It's been months."

SOURCE: wheres the speed sensor located on a 1998 chevy

The speed sensor is in the tailhousing of the transfer case. Do you have a check engine light on?

Testimonial: "thanks for the help... Allen "