Clunk sound when taking off from a stop...

[My9373]

Hey guys, lately, I've noticed when I'm sitting at a red light, and go to accelerate, really at any speed, fast or slow, I notice a quick clunk when the truck starts to move forward. This is the only time it does it, when I take off from a stop, just wondering what is causing this and how can I fix it? Just don't want to do any unnecessary damage to the truck. Thanks all,

Derek

 

[pt_Ranger_v8]

check your driveshaft u-joints. Put the tranny in gear, crawl under the truck (with it off, obviously!), and wiggle the d-shaft. You'll find the culprit pretty quickly.

 

[My9373]

Cool, so wherever the wiggle is, just replace that joint? That was easy! Thanks, too btw, that was a fast response haha

 

[jonathan]

i would replace all of the u joints if money will allow you to

 

[My9373]

How much do good U-joints cost roughly for these trucks, and how many are there total?

 

[My9373]

I really need to do all of it soon anyways, U-joints, ball joints, tie rods, grease everything, tighten everything, the works, the front end of this truck is bumpy, noisy and loose, it needs a thorough going through.

 

[pt_Ranger_v8]

for the rear driveshaft, you could have 2 or 3 or 4 or more. Depends on the truck. Go look.


As for cost, well, how much do you want to spend?

 

[Dsl_Dog_Treat]

Check the pinion nut for the rear axle. My shiny dime bet is that the nut has backed off causing the clunk. If so, drop the driveshaft, take the pinion nut off, clean the threads and locktite the snot out of it and retorque to 160 ftlbs.
Seen it too many times and check all my customers trucks when they come thru the shop.

 

[My9373]

Check the pinion nut for the rear axle. My shiny dime bet is that the nut has backed off causing the clunk. If so, drop the driveshaft, take the pinion nut off, clean the threads and locktite the snot out of it and retorque to 160 ftlbs.
Seen it too many times and check all my customers trucks when they come thru the shop.

Thanks for that info, never thought of that, I will double check that when I check the joints to see if that's an issue. After 262k miles, lots of things have worn, loosened up and tired out haha.




As for how much to spend, idrc, I usually like mid-grade to premium parts, and as much as I love this truck and want it to last and how hard I work it, I prefer all premium parts for it.

 

[jonathan]

u joints are about 15 bucks at azone

 

[BigRigTech]

2wd or 4wd? I've seen some Fords that have an issue with the slip joint entering the t-case binding for a second on acceleration....There was a TSB from Ford on this sympton in the mid 90's...They recommended a special teflon based lube for the splines...My 96 F150 4x4 did the same thing - drove me nuts until I found the TSB online.

 

[icanfixall]

It would be great to know if your truck is a cc or extra cab. 4x4... Standard oe auto. Year..... These questions will help giving you answers. All the above posting are really good ideas. You might want to check the tran tail shaft mount. Look to see if any bolts show movement where they bolt thru the frame or mounts. The sound you hear is when the engine is torqueing the driveline. That makes things climb up on things because its a twisting motion.

 

[jperecko]

judging by his handle, I would guess it is a 93... now as far as 2WD, 4WD or cab config... no idea

 

[Cucamongan]

u joints are about 15 bucks at azone

do you recommend idiotZone parts though?

 

[My9373]

Sorry guys gonna get a sig made up asap to resolve this. Its a 1993 F250 xlt 7.3l 4WD w/e4OD auto ext. cab w/8' bed. Trucks has over 262k so im sure lots of parts are tired and loose, I've got a ridiculous laundry list of things I want/need to go through with it this summer so it can handle my daily driving and I can sell my jeep.