I have a chevy trailblazer 2004 during winter i had it in a4wd after i got stuck one day in the snow the service a4wd came on then a few months i am driving and my engine reaves up the rpm and jerks forward but i tried changing into the gears and its stuck at 4h not changing into no other gear

Marvin

• 85242 Answers
• Posted on Jan 02, 2009

SOURCE: The gear shift lever on

check the brake light circuit (do the brake lights work), this is what provides power to unlock the shifter, it is called the brake park interlock and is one of the new DOT safety devices..

SOURCE: chevy avalanche transmission problems

Hello;
Are you getting the check engine light? If so the electronics may have gone out. You may not need a rebuild but you won't know till you pull the oil pan on the transmission and inspect the contents. You may also have lost the neutral safety switch. It is mounted on the drivers side of the transmission. Check those out first and let me know what codes you get.
For Ponchoboy; the clunking and hissing you hear are teminal root causes. Drop the oil pan and if it has a lot of filings and metal it is time for a rebuild.
Hope this helps; Rate me highly;
Rich
RPM Northwest

SOURCE: 2006 Chevy Trailblazer - winding noise

I went to the dealer to check on the price for the idle pulley and they said that was waht the problem was. The quote from them was $99 for Labor and $38 for the pulley..Solution $18.00 at the parts store and 20 min from my hubby and it is fixed. The only problem with the pulley form the auto parts is that the original washer won't fit in the hole so we had to but a seperate washer. Runs great now I just have to find a solution to the gas gauge and fuel sensor.

SOURCE: My 2001 Ford Expedition wont go forward....

Do you have a check engine light? When it wouldn't start, was it cranking over? Sounds like it could be a transmission range switch.

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.