When I put my truck into drive it will immediately go into drive and start to pull forward as it should. After the truck rolls forward about a foot I feel a clunk and the truck will pull harder. It feels as if it is going into drive twice. It does this everytime and has done this for awhile but I don't remember it doing this when I bought it. It is not getting worse. Is this anything to be concerned about?

 

Well to be honest your trans might be going out, but the thing to do is just check the fluid level and stuff. I wouldnt do a flush or anything on it, just add some fluid if it is low. I know when I put my truck in drive, it doesnt like to "catch" and it finally does after a little bit of revving and the transition to 2-3 is really rough. But like i said, add fluid if it is low.

 

I don't think that the transmission is going out because it has been doing this for a long time and has not gotten worse. It does everything else flawlessly. It has fluid. If anything it's slightly overfilled.

 

See if this helps -
FORD:
1998-2004 F-150 ISSUE:

Some 1998-2004 F-150 4X4 vehicles with a one piece drive shaft may exhibit a clunking or grunting noise and/or a shudder sensation from the driveline. The condition will typically occur during light to moderate acceleration from a stop and/or braking. This may be caused by the slip yoke not sliding smoothly on the transfer case output shaft splines.
ACTION:

To service, lubricate the slip yoke with Teflon Grease (D2AZ-19590-A). Refer to the following Service Procedure.
SERVICE PROCEDURE

1. Road test the vehicle to verify the condition.
2. Remove the driveshaft per Section 205-01 of the Workshop Manual. NOTE:INDEX (MARK) THE DRIVESHAFT YOKE TO AXLE FLANGE FOR REASSEMBLY.
   
3. Lubricate the slip yoke with 7-13 grams (0.25-0.46 oz.) of Teflon Grease (D2AZ-19590-A).
4. Re-index and reinstall the driveshaft per Workshop Manual.
5. Check the transfer case fluid level and add MERCON Automatic Transmission Fluid XT-2-QDX if necessary.
6. Road test to verify the condition is corrected.