Anti-Spin Rear Differential seems to be ratcheting when hot after high speed travel

[JPM]

The Anti-Spin Rear Differential seems to be ratcheting when hot after high speed loaded straight line interstate travel . It happens when we pull off for fuel, and need to make slow sharp turns , that's when I notice it.Is that something to be concerned about?

 

[Prairie Dog]

Not sure if this is what you mean or not but mine has always been very tight in sharp turns whether hot or cold. It tends to want to chirp the inside tire a lot.
I think it has to do with the manual trans. The low speed power pulses are more direct and jerky than the auto and if I slip the clutch it doesn't do it so much. This is all just my theory of course.
My diff was gone through by a local shop (gears in carrier chipped) and afterwards it worked exactly the same.

Scott

 

[JPM]

Thanks Scott, sounds like we have the same symptom, it must be another nature of the beast!

 

[cerberusiam]

Pretty normal turning shop under a load when warm. Just means that the TQ bias is working correctly. If it did NOT show those systems it would be time for some concern.

Not just a manual thing, my auto truck will do the same thing. Empty it just slides or spins the tire, loaded it will pop as the brake shoes grab the outside axle.

 

[JPM]

I'm not sure I follow your comment about the brakes shoes grabbing.

 

[cerberusiam]

The LS has brake shoes on each piece on the side gears, when that piece rotates out due to axle speed differetntial the brake shoes in the LS grab the axle drive connector to slow it down and transfer power to the other side. Under a load there is no slippage so they pop as they grab and release.

 

[JPM]

Pretty normal turning shop under a load when warm. Just means that the TQ bias is working correctly. If it did NOT show those systems it would be time for some concern.Not just a manual thing, my auto truck will do the same thing. Empty it just slides or spins the tire, loaded it will pop as the brake shoes grab the outside axle.


......The LS has brake shoes on each piece on the side gears, when e that piece rotates out due to axle speed differetntial the brake shoes in the LS grab the axle drive connector to slow it down and transfer power to the other side. Under a load there is no slippage so they pop as they grab and release......

another "good to know"!

thanks

 

[JPM]

check out the last comment

https://www.turbodieselregister.com...-Rear-Differential-Info?p=2434959#post2434959

 

[cerberusiam]

That is not the same differential that is in your truck, really apples to oranges comparisons. What you did not say in this thread is the fact you used frciton modifier additive, that is a no-no. The TrascRite works fine and is quiet for the most part on a straight GL5 lube, preferably 75-90W. The additives will influence how the brakes grad the side gears and that gets worse warm under a load.

They are finicky if things go wrong, drain and checking the fluid for residue or discoloring is a good idea on a regular basis. I would drop the fluid and flush as much as possible looking for metal flakes then refill with the correct fluid and see if that changes anything.

 

[HHhuntitall]

cerberusiam, your knowledge shows up again.... I looked and somehow I am cornfused on the differential setup.... Glad we all work together.....

 

[cerberusiam]

We just WISH it was the cross shaft Torenson design. Unfortunately the Cummins would eat it for lunch with breaking a sweat.

 

[JPM]

That is not the same differential that is in your truck, really apples to oranges comparisons. What you did not say in this thread is the fact you used frciton modifier additive, that is a no-no. The TrascRite works fine and is quiet for the most part on a straight GL5 lube, preferably 75-90W. The additives will influence how the brakes grad the side gears and that gets worse warm under a load.

They are finicky if things go wrong, drain and checking the fluid for residue or discoloring is a good idea on a regular basis. I would drop the fluid and flush as much as possible looking for metal flakes then refill with the correct fluid and see if that changes anything.

I'm having the oil changed(amsoil) , and I hope that it will put this worry to bed

 

[HHhuntitall]

We just WISH it was the cross shaft Torenson design. Unfortunately the Cummins would eat it for lunch with breaking a sweat.

HA!! No, I think it COULD be built to hold up.... I get so confused with all the stuff I get to work on... some if it's a blessing, some of it a curse... seems it's more fun working on someone else's stuff on weekends..... could be the paycheck, I dunno.

I'm having the oil changed(amsoil) , and I hope that it will put this worry to bed

Good deal!! Be sure they check it out and flush it as best they can. If there are no major filings, no worries.

 

[cerberusiam]

HA!! No, I think it COULD be built to hold up.

Not in the size it needs to be to fit the differential, that is the issue I think. Once you build it big enough to handle the stress and heat, oops, you have and MD sized differential and costs sky rocket.

EVERY single piece in the drive train of an LD truck sporting an MD engine is over tasked and over managed to have a useful MTBF. All the torenson cross shaft stuff seems to be in high HP low TQ engines like Audi, Toyata, etc. I don't hink they like the TQ. The helicla gear system has built in slip to managed the TQ rise, pretty sure that is why it is popular.

 

[EB]

I just had the entire Torenson piece replaced in my 07 cab and chassis, it came apart and made a mess of most of the rear end. When it was rebuilt the oil that was used was the oil from the Dodge house and it was grabbing pretty hard on turns with my trailer heavily loaded. Went back and they put some friction modifiers in it and it got much worse. I switched back to the oil I usually used, Amsoil Severe Gear 75/90 and solved the problem. I can turn with a heavily loaded trailer while accelerating with no grabbing.