I have a 2003 Ford F150 Supercrew with the 5.4L V8. Now when I engage the 4wheel drive into 4L you can hear and feel a hell of a clunking sound like the transmission fell out or something, and when you engage it back into 2wd it does it. What could be the problem?

 

Don't get mad at me but .....Do you got the trans in Neutrtral

 

When shifting into 4 wheel drive or when taking off? When engaging it into 4 wheel drive I had it in park. Never used 4 wheel drive before.

 

When shifting into 4 wheel drive ........Thats when you hear it right??

 

Yeah when I shifted it into 4 low it did it, and when I shifted it back into 2wd I heard it. Both times I stopped, and put the truck in park.

 

I shift my tuck in to 4 wheel drive with the trans in neutral...Some times if you are not in neutral It will do that but...... Other than that i'm lost with out hearing it my self. sorry and good luck!

 

Thanks I appreciate the help. I read the manual just now, and it says you can engage 4H while driving down the road but not over 45 mph. Then when shifting into 4L you have to put it in neutral. Thanks, and hopefully next time I use it I will do it right, and hope for no big clunking.

 

you keep saying 4 wheel low... don't you have to be in neutral to go into 4 low?

My truck you can go into 4 high in park, drive or whenever you want (on the fly) but you have to shift into neutral to go into 4 low.

does it make noise going into 4 high? or possibly the noise is because you are not in neutral.

 

Yeah you are suppose to be in neutral when shifting it into 4L, but I've never used 4 wheel drive before so I wasn't sure. I'm not sure if it makes the noise going into 4H, because after hearing it I didn't even try the 4H. I am thinking the noise was because I didn't put it in neutral when I shifted into 4L

 

Your truck must be basically stopped, put in neutral, then into to 4L (low range)!!
4H (high range) is your usual day to day slippery, snowy going down the road condition driving, when you need 4 wheel drive,,when dry road is encountered,,,then back into 2H.

 

Thanks y'all for all your input. It's helped out a lot