I have an 04 Silverado 2500HD gas. It has the floor shifter for the 4DW. I have always been able to go into 4WD while driving, I’ve always kept it under 40 and let off the gas then pull the shifter into 4WD HI. I haven’t used the 4WD for almost 6 months so yesterday I decided to try it. I let off the throttle pull the shifter down and it started to grind. I came to a stop at the next town pulled down on the shifter and it went into 4WD. I was going about 25 MPH and shifted into 2WD no problem. Tried to go back to 4WD when moving and it started to grind. Any idea as to why now I have to be stopped to go into 4WD?

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Factory Stock
The way God intended it to be.

4 WD is electrically done in the front axel pumpkin, the solenoid may be gone you can check it by removing the solenoid and have someone else put it in 4 WD with the ignition on and watch the solenoid. They do all the time and are expensive parts at the dealers, parts stores are cheaper and some places even sell a mechanical cable to fix it so the electronic part is never a problem again.

Steve

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Technology is great when it works,
and one big pain in the ass when it doesn't



Detroit iron rules all the rest are just toys.

[This message has been edited by 84fiero123 (edited 11-17-2014).]

I never try on the fly 4wd even if its supposed to be able to. But then I dont have a vehicle that new, maybe things have improved?

Sounds like the servo could be hanging up. They can go out too but for now you may want to consider full stop shifts.