Godawful clunking

[Trump8MyKids]

Had to miss school and work last Monday due to me having to drain my diff oil because my diff ate up my abs sensor (probably should have been a sign from the start). Something as of earlier today is making a terrible clunk inside of there. originally it happened whenever I’d let off the gas but now it happens regardless of my accelerator pedal position. I was told by somebody on here to check for play in my rear differential (wanted to check carrier bearings) but I later found out the parking brake was set by my girlfriend seeing I was on ramps and I didn’t set it. Not sure if that would affect the results. The noise only happens over 25 mph. Any ideas on what the noise could be? Everybody I have talked to about it is baffled, as am I. Any help would be appreciated!

 

[Dirtman]

Do you have a 1 piece or two piece driveshaft?

 

[ericbphoto]

Check for play in your drive shaft u-joints as Dirtman is alluding to. And carrier bearing if you have 2-piece drive shaft.

I'm not convinced that your differential is OK. I don't recall you actually identifying and correcting a root cause for the destroyed speed sensor. I would check for play in your pinion shaft. That by itself would not destroy the speed sensor. But it can cause some clunking.

Chock the front wheels to keep the truck from moving. Get the rear axle up on jack stands. Make sure transmission is in neutral and parking brake is off. Then crawl under and start trying to move things looking for play in the u-joints and pinion shaft.

 

[sgtsandman]

Since you have a manual, there will be some clunking between the pinion and the ring gear when the truck is engine braking then you press the gas pedal due to back lash play. If it's doing it any other time, there is a problem. Automatics tend to not do that from what I've seen due to power constantly being pushed to the back wheels through the transmission.

 

[Trump8MyKids]

Do you have a 1 piece or two piece driveshaft?

One piece

 

[Trump8MyKids]

Check for play in your drive shaft u-joints as Dirtman is alluding to. And carrier bearing if you have 2-piece drive shaft.

I'm not convinced that your differential is OK. I don't recall you actually identifying and correcting a root cause for the destroyed speed sensor. I would check for play in your pinion shaft. That by itself would not destroy the speed sensor. But it can cause some clunking.

Chock the front wheels to keep the truck from moving. Get the rear axle up on jack stands. Make sure transmission is in neutral and parking brake is off. Then crawl under and start trying to move things looking for play in the u-joints and pinion shaft.

I will do that now thank you. I will post my results along with a video of what is happening if my phones mic will pick it up.

 

[Trump8MyKids]

Okay update: decided to go buy new jack stands and on the way there it clunked twice in the first mile and hasn’t done it since. The drive to get the stands was about ten miles one way so I think it’s safe to say I’m okay for now. However in the case it’s temperature related or just an off an on thing I’ll let you know.

Also when I got back I got it up on the jack stands but didn’t find any play in any u-joints or the differential. Only play I found was the usual play in the transmission.