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: no reverse
there should be a vacuum tube on the pas side of the trans. its either diconnected or broken. or the bans are bad. also check the filter. mine went bad and all I did was change the filter and used synthetic fluid.
when the pan and filter is down see if there is a heavy spring in one of the corners. if its casing is broke then it wont allow fluid to travel to and fro.
SOURCE: 2005 chevy silverado 1500, service 4 wheel drive, gears
Sounds like a bent fork in the transfer case. It is a common problem with your truck. The transfer case is a np236. If it just recently started doing this, the rebuild will cost around $800. If the 4wd has been acting up for a while, the planetary will probably need changed, which is another $200.
SOURCE: Silverado Starting
have you changed the fuel filter recently?. fuel pressure regulator could be starting to get tired, the truck is 7 yrs old
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