Clunking Rear End

[captainsae]

I just changed the fluid in my rear differential to Lucas 80w-90. The bottle says that no lsd additive is necessary. Now when I turn a corner slowly, it makes a clunking noise that I can hear and feel. It made no noise or clunking prior to me changing the fluid. Does this mean it's working properly now or does it mean that I need to put LSD additive in the rear end? Or do I need to start all over and use something else completely? Why the hell dont they just sell gear lube made for LSDs in auto parts stores?

[captainsae]

I just changed the fluid in my rear differential to Lucas 80w-90. The bottle says that no lsd additive is necessary. Now when I turn a corner slowly, it makes a clunking noise that I can hear and feel. It made no noise or clunking prior to me changing the fluid. Does this mean it's working properly now or does it mean that I need to put LSD additive in the rear end? Or do I need to start all over and use something else completely? Why the hell dont they just sell gear lube made for LSDs in auto parts stores?

 

 

Let me put it another way. Is it normal for the LSD to clunk if it is working properly? What kind of gear oil do you guys use? Do you use the LSD additive?

[captainsae]

Let me put it another way. Is it normal for the LSD to clunk if it is working properly? What kind of gear oil do you guys use? Do you use the LSD additive?

 

Well, I just found this thread on another forum. If anyone is interested, here's the link.

 

http://www.4x4parts.com/ubbthreads/showfla...amp;Main=536625

[94extreme]

no clunking. i use basically just any as they all have additive in them now-a-days. it's hard to find some with out. whatever the recommended weight by your owner's manual, is what i'd go with.

[denisb]

I've used it for trannys and high mileage motors with fairly good results but maybe it might be a tad to agressive of a stop slip oil for an LSD (with the LSD clutches and all).

 

I think you pretty much answered your own question tho when you asked about the clicking in the rear end. Unless you have lockers....LSD rear ends should not click.

[captainsae]

Well, I put some CRC EQUA-TORQUE differential additive in it and it's quiet as a mouse now. I called Lucas and told them what was going on and all they said was to add their oil stabilizer LOL. I will have to say that I have a pretty low opinion of Lucas products at this point. I'll bet all the oil stabilizer I've put into my engine was a waste of money as well. One guy told me that Royal purple was the shiznit but I couldn't find any in the weight I needed. I've heard Amsoil is great as well. I'll stick with this Lucas crap for now but never again...