high pitch pinging/vibrating sound

[bgs26]

Well my Bronco decided today would be a good day to develop a new noise. I trailered it to the meet & greet in Baton Rouge and then back home. I stopped at my in-laws to drop off the trailer. My wife drove the Tahoe home and I drove the Bronco. When I got on the road 1st gear was fine. 2nd is pretty much normal too. When I hit 3rd gear the noise started. I let off of the accelerator and the noise stops. Push accelerator again and noise continues. The only thing I did that I have not done in a while is put it in 4wd to load it on the trailer. When I unloaded it, I unlocked the hubs and put the transfer case in 2wd. I thought maybe the front driveshaft was turning but when I got home, my wife watched the shaft while I moved the Bronco and it was not moving. It got dark outside before I could continue to investigate. Any ideas?

 

[fordtrucksrule]

well your problem sounds like the rear driveshaft. much easier than mine i just broke 2 u joints on my d-44 and blew up my warn perm hublocks bummer

 

[bgs26]

it doesn't sound like a driveshaft. I have heard what a u-joint fixin' to break sounds like and it is nothing like that. Plus they are almost brand new shafts and u-joints. I will check it tomorrow. Any other ideas?

 

[ElkhartBronco]

rear ring gear getting ready to take a crap?

 

[fordtrucksrule]

ck timing on engine

 

[idahobronc]

Have you checked your rear cv joint?