1983 Mack superliner front rear problem making funny sound

[Lucky dogg]

Hello all, I have a 1983 Mack superliner with factory Neway air ride suspension.  Ithe is a single Frame and I believe it has 38,000 rears.  It does not have a power divider with the switch.  I recently put a t2180 transmission is this truck and just got it back on the road and now I am hearing a sound from the front rear.  It sounds like a big heavy flat washer dropping from my hand to the ground.  It does this sound multiple times in 100 yards.  The truck is not skipping a beat and after pulling the side cover off there does not appear to be any teeth missing or damage.  Fluid was super clean and no shavings or steel dust at all.  All my rearend shops are telling me the rearends blown and they also can't look at it for 7-10 days.  That's a lot of revenue to lose with it just sitting.  I can also tell you since this noise started a week or so ago, as he ran the truck it has gotten more frequent and louder also.  Any help or suggestion would be very helpful!  Please let me know.   

[41chevy]

Sure the sound is in the diff and not in the drive shaft or u joints and telescoping to sound like it's in the diff?

[blackdog2]

Budd rims steel Ive seen wheel rims break the center out and everybody go to the rear .

 

[j hancock]

You may not have a locking power divider but more than likely you have an "automatic" power divider.  The peanuts inside could be roasted.  Power dividers have their own oil supply so pull the drain and fill plugs for an inspection.

 

Do you know the history of the T2180 installed?  

[alex g]

I changed a hanger bearing once and it turned out to be wrong bearing although it fit in place but it pushed driveshaft in to bearing made alot of noise and resonated through truck. Possibly trans you changed could be  a touch longer 

[Lucky dogg]

The truck has aluminum wheels inside and out and have been checked so not that

Transmission is used, but has 90 day warranty.  This issue started to occur a few days after we drove the truck a bunch. Mack and a drive shaft Shop remade brand new drive shaft and new u joints and straps also

I did hear about the auto diff lock peanuts and there is a section at the top of this rearend with its own Oil plug or so it appears.  What would I do there?  The truck was just working in a really muddy area where this would of been used a ton?  Any suggestions?  Is that a part we can change on our own without pulling the pig?

[Lucky dogg]

Called both local shops, they both confirm that the entire rear is blown, and they both claim they are booked up for 2-3 weeks now.  Guess I am in the wrong business. . . I must say I am a bit spectacle with there responses.

[kscarbel2]

The fastest way to get back on the road and generating revenue would be to take it to your local Mack distributor (R&R ?)

http://rrtrucks.com/Locations/

[macks in nigeria]

On 11/14/2017 at 2:26 AM, Lucky dogg said:

Hello all, I have a 1983 Mack superliner with factory Neway air ride suspension.  Ithe is a single Frame and I believe it has 38,000 rears.  It does not have a power divider with the switch.  I recently put a t2180 transmission is this truck and just got it back on the road and now I am hearing a sound from the front rear.  It sounds like a big heavy flat washer dropping from my hand to the ground.  It does this sound multiple times in 100 yards.  The truck is not skipping a beat and after pulling the side cover off there does not appear to be any teeth missing or damage.  Fluid was super clean and no shavings or steel dust at all.  All my rearend shops are telling me the rearends blown and they also can't look at it for 7-10 days.  That's a lot of revenue to lose with it just sitting.  I can also tell you since this noise started a week or so ago, as he ran the truck it has gotten more frequent and louder also.  Any help or suggestion would be very helpful!  Please let me know.   

This was where your problem really started,when you drive a truck  and hear any usual sound you attend to it immediately and not continue driving the truck in the hope that the sound will disappear.The time you didn't want to spare you are losing now in addition to some serious $$$$$.Goodluck.

[j hancock]

12 hours ago, Lucky dogg said:

Is that a part we can change on our own without pulling the pig?

Your best bet is to pull it so the pinion can be set properly if you need to chase peanuts.

Change the oil on the power divider and that will either confirm that it is the issue or not.  If you find random pieces of metal, they will be your noise maker.

[Lucky dogg]

UPDATE: After a some what heated arguement at the local rearend Shop this morning I am more and more determined the tire man who changed the tires before the truck went on the road left something in the simulator or something is broken behind the dust cover of the housing.  The local rear end Shop refused to take the tires off to check and said the entire rearend is completely blown even though I took them a sample of the gear Oil.  They told me the sample doesn't help or mean anything.  They told me I should buy the rear suspension. Cut off from the guys buddy and scrap the whole rearend.  What a valuable lesson I learned today.  Thanks all!

[j hancock]

Time to find a shop that will do a proper diagnosis.

[theakerstwo]

Make sure all tires are same size and that one is not worn dowm more than others.Mis match tires will make the power divider pop.

[Vladislav]

19 hours ago, Lucky dogg said:

UPDATE: After a some what heated arguement at the local rearend Shop this morning I am more and more determined the tire man who changed the tires before the truck went on the road left something in the simulator or something is broken behind the dust cover of the housing.  The local rear end Shop refused to take the tires off to check and said the entire rearend is completely blown even though I took them a sample of the gear Oil.  They told me the sample doesn't help or mean anything.  They told me I should buy the rear suspension. Cut off from the guys buddy and scrap the whole rearend.  What a valuable lesson I learned today.  Thanks all!

That is the last thing you can do any moment. Sounds about like you have a wrong truck so should replace it completely.

The power divider could be opened from the drive yoke end taking off the parts step by step. Or could be removed completely driving off the bolts which attach its body to the main diff housing. You may be getting some troubles parting it out on a bench this way though. The carriers content is generally a easy thing excepting divider. Just two sets of gears in each one. And if you have a real break of teeth you're automatically on a shoulder with no move. And sure presence of broken parts in the oil together with "silver powder".

[Lucky dogg]

Hello all --UPDATE: had my mechanic tank the tires off today.  We found a brake drum balancing weight stuck inside the aluminum wheel that the Weld did not hold the weight to the drum.  A few local shops said they haven't seen this very frequently at all if any?  Problem solved!  Thanks for all your help.  Seeing your posts helped me to dig deeper!

[carlotpilot]

11 minutes ago, Lucky dogg said:

Hello all --UPDATE: had my mechanic tank the tires off today.  We found a brake drum balancing weight stuck inside the aluminum wheel that the Weld did not hold the weight to the drum.  A few local shops said they haven't seen this very frequently at all if any?  Problem solved!  Thanks for all your help.  Seeing your posts helped me to dig deeper!

glad to hear all worked out   ( you might also look for a real truck shop)

[mackey58]

I'd find a different rear end shop also.