Do i need to put in LSD fluid?

[sniperd]

im about to drain my differentials and put in a 75-90 gear oil in them however i dont know if i should add LSD additive? how do i determine if i should and also which kind is best (if i need too)?

 

[Chaddy]

im about to drain my differentials and put in a 75-90 gear oil in them however i dont know if i should add LSD additive? how do i determine if i should and also which kind is best (if i need too)?

Just throw in some valvoline 80/90.

 

[nvrenuf]

Do you have locking / limited slip diffs?

 

[SkulzNBonz]

I've been both route w/ the wonderful 10 bolt "Gov Bomb". Save your money and go with gear oil only. If you wheel at all, that limited slip, if you have it, is going to "splode".

John

 

[sniperd]

Ok so just straight up gear oil then, no additives....


Thanks everyone

Do you have locking / limited slip diffs?

No lockers on the differentials, but the hubs lock. and i dont know if i have a limited slip diff, i need to find out how to tell.

 

[AuH2O]

Ok, stupid question from a new K5 owner, but how DO you drain the (10-bolt) differentials? There's no drain plug! I've ordered the Truck Shop Manual, but who can wait for that to arrive? Can I just remove one of the lower bolts? Surely you don't have to remove the whole plate just for an oil change, right? And don't tell me it needs to be sucked out...

 

[Hogback Fabrication]

Put a drain pan under the diff. Unbolt the nine lower most bolts (yeah, there are 10 total believe it or not). Loosen but do not remove the top bolt. Gently use a screwdriver or similar device to seperate the cover from the housing. All of the fluid will drain out.

 

[AuH2O]

Put a drain pan under the diff. Unbolt the nine lower most bolts (yeah, there are 10 total believe it or not). Loosen but do not remove the top bolt. Gently use a screwdriver or similar device to seperate the cover from the housing. All of the fluid will drain out.

In other words, I do need to remove the whole damn plate. For every oil change... I can't believe they didn't just put a drain plug underneath the diff.

 

[Hogback Fabrication]

Why didn't they put a drain plug at the bottom of the diff? Cost. How often do you really need to change the diff fluid? Besides, it gives you a good chance to inspect everything inside the diff and make sure everything is in good shape.