so i got something in my drivetrain kinda hooking up making a poping sound in 2high, It only dose it in reverse with the wheel cranked to the right.(in 2hi) i don’t feel it or hear it with the wheel cranked to the left. I also can’t make it pop going fed in either direction (in 2hi) 

 

In 4high  I can make it pop going forward with the wheel either way, like barely half to 3/4 turn not even cranked. if i kept wheel straight in sounds fine but turning the wheel either way it was binding up hard. I was on  dry pavement so i know it 4high this is somewhat normal.

 

 I am more concerned about the 2hi noise. I cant find any play in any axel joint or u joints. I just had the diff cover off and inspected the oil, was a little dark and there was a little fine metal on the magnet, but it didn’t look to bad, there’s 10k miles on it since i rebuilt it when the cone on passenger side where spider gear rides grenaded, and i had to dig out all kinds of metal. That being said i couldn’t feel any play in rear wheel bearing or rear pinnion, That would be the 3 gear oil change since the rebuild in 10k miles there’s a little more metal on the mag then i would like to see and the oil was a little darker then i like but i couldn’t find any chunks of metal in the housing and i rotated the axels and everything in the 3rd member that i could see looked fine. I checked backlash and it was right at .008, that’s where i remeber setting it when i rebuilt it 10k miles ago . Any input is appreciated as i am gearing up to two a 15k load this early spring and i would prefer not to be the guy on the side on the hwy!!

 

thanks 

First thing I would have said, ujoints. Next spider gears, not sure what to tell you other then double check everything. What's that brown color stuff in pan, looks like water mixed with oil almost, unless it's a reflection. 

Where is noise coming from, front or rear.

Only thing that changes when you turn steering wheel...is the axle joints in front diff.

Jack it off the ground and turn steering wheel and the rotate wheel by hand.

Bet you 1 has a seizing joint.

Easy to check but no one ever does.

Chris  

Funny you should post this because Im going through the exact same thing right now on my 01. 

Okay so i believe it’s coming from the rear, it’s like it’s in four wheel drive when in reverse with wheel cranked to right, it feels like my clutch’s slipping , but not as intense as 4wheel drive iwas wondering if it has anything to do with the driver side front always turning? Because i believe the 4x4 disconnect only disengages the passenger side, just a thought i had on why it only dose it with wheel cranked to the right in reverse.

 

And to awnser your question, there was no water in my oil or differential, that must be a reflection from something inside the shop.  Also my u joints are tight i can’t get any play from them with a pry bar, same with axel joints.

 

i will try jack up front end and crank wheels and rotate and see if i can feel it there. But if it was a front axel joint why would it only do it in reverse and not going fwd?

On 2/11/2019 at 7:47 PM, Dieselfuture said:

First thing I would have said, ujoints. Next spider gears, not sure what to tell you other then double check everything. What's that brown color stuff in pan, looks like water mixed with oil almost, unless it's a reflection. 

Where is noise coming from, front or rear.

Is there a way to check spider gears without tearing down third member?

3 hours ago, JP907ATB said:

Is there a way to check spider gears without tearing down third member?

Not 100% sure, maybe put axle on jacks and tranny in gear, then rotate one tire the other should go opposite direction. If it's Dana 70 they are known to have problems with that stuff. Ether clutch packs or spider gears, there is a pin in spider gears and sometimes little set screw/bolt comes out and pin moves. 

Could be even the clutches are worn out in the rear axle. Wrong lubricant or not enough friction modifier. I would open it up and inspect everything. Some times you are forced to do jobs you really don't want to do. Better of that way knowing what is going on.