I have a 99 Z-71, with minor engine upgrades. There is a clicking noise coming from the rearend that gets louder as more power is applied, but stops at speeds above 40 mph. From there there is just a slight vibration that gets worse as speed increases. I have read some older threads and it seems like my diff is going. As such, I need a new one.
I believe I have 3.73 gears and limited slip, which does work still, but takes a while to lock. What do you guys recommend?

 

Is your truck lifted? What mods do you have?

 

Sounds like the good ol G80 is pooping out on ya. Eaton LSD is a pretty good choice. But, it also depends on how agressive you want it to be.

 

It is actually lowered. I removed the lift blocks, but that is all. In the future, I don't have much for mods. In the future, I would like to have around 450 hp so I want something that will hold up. I have stock tires and stock gearing. Mods so far are pretty basic: exhaust, intake, light tuning. I should have a TC, shift kit, and servos in the near future. What do you mean by aggressive?

 

Eatons LSD will work for what you want. By agressive I meant how noticable do you want the diff to be?? Clicking around corners and such. Preaload springs can be changed in the Eaton diff to make it a bit tougher around corners so theres less slip between wheels.

 

Eaton.

 

I prefer truetrac but an eaton is a good unit as well.

 

I have the TruTrack and it works great. No clutches. All gears. Strong.

 

true trac here also...no clutches.all gears..very happy with it..