Help diagnosing a rhythmic thumping noise when driving.

[fatmonk8]

have you tried jacking it up and putting it in gear to see if you can find the source?
it can be done within reason I just wouldn't try to rev it up much usually with wheels off the ground it will spin up to a slow speed like 10mph or so without even applying any pedal.
that might be enough to determine if it is transmission, transfer case, rear diff, etc
if you don't hear it then it might only be doing it under a load
if is awd then all 4 wheels need to be up
i have done it with wheel chocks and jack stands or just jack stands if all wheels need to be up
and these trucks are tricksters, the sound can carry might sound like it is coming from one place and actually be coming from another......

Yes, I jacked up the back and put it in both neutral and in gear. In neutral I spun it myself.

Couldn't hear anything obvious.

As far as I am aware it's only 2wd as I never have it in 4wd, not even auto.

It's got to be something under load.

 

[Doubeleive]

Yes, I jacked up the back and put it in both neutral and in gear. In neutral I spun it myself.

Couldn't hear anything obvious.

As far as I am aware it's only 2wd as I never have it in 4wd, not even auto.

It's got to be something under load.

that makes it harder, you might need some chassis ears or take it to a shop that has some
generally the chassis ears are not cheap at least the last time I checked there might some chineseium on amazon or something

 

[Doubeleive]

Yes, I jacked up the back and put it in both neutral and in gear. In neutral I spun it myself.

Couldn't hear anything obvious.

As far as I am aware it's only 2wd as I never have it in 4wd, not even auto.

It's got to be something under load.

I see a kit on ebay for about $50

you attach it at various places, go drive then narrow it down based on the level detected

Chassis Ears Automotive Electronic Stethoscope Engine Noise Finder 6Channel F1P1 | eBay

This Electrical Stethoscope is a high performance maintenance tool which is particularly suiable for use in machine noise detection. 1 Car Noise Finder Kit. Color: black. Material: ABS.

www.ebay.com

 

[fatmonk8]

I see a kit on ebay for about $50

you attach it at various places, go drive then narrow it down based on the level detected

Chassis Ears Automotive Electronic Stethoscope Engine Noise Finder 6Channel F1P1 | eBay

This Electrical Stethoscope is a high performance maintenance tool which is particularly suiable for use in machine noise detection. 1 Car Noise Finder Kit. Color: black. Material: ABS.

www.ebay.com

Interesting, I'll look into one of these. Thank you!

 

[fatmonk8]

Ended up being my transmission

 

[the 18th letter]

Ended up being my transmission

What was wrong with the transmission?

 

[fatmonk8]

What was wrong with the transmission?

Torque converter. Went long enough to damage the transmission apparently bunch of metal in the pan. Figured to get it checked because transmission started slipping.