Does a Guv-lock need the posi additive?

[08Malibu]

The one in my 05 Sierra doesn’t need additive. The limited slip in my Malibu uses the additive.

 

[UNGN]

My 2000 2500 Yukon XL has a gov lock in back, but the factory manual does not say anything about additives. Probably couldn't hurt.

The Window Sticker describes it as "locking rear differential" - Sure.

 

[500/600]

The old truck 12-bolts flat out sucked due to spindly governor parts. The later stuff might be way better. The way they work is great. Just under designed from a strength standpoint. Yukon makes an improved version but with all the other choices out there I can’t imagine spending the money on one.

 

[bracketchev1221]

I didn't use any on my 2006 2500 suburban.

 

[pontiacgp]

The company you got it from is still open so why not shoot them an email.....

 

[olds307 and 403]

They do have clutches and they do lock like a locker when the conditions are right. I could not get it to lock after parking my Z71 in a snow bank, not enough movement, I guess. It did work once moving, I could push snow over the bumper. I added it because I got it cheap. The dealer or whoever ordered it, thought it was good idea to have two open diffs on a truck with the off road package.

 

[Bonnewagon]

Can't hurt to put it in, right? My Pontiac 400 didn't kill it and it was great in the snow.

 

[08Malibu]

They do have clutches and they do lock like a locker when the conditions are right. I could not get it to lock after parking my Z71 in a snow bank, not enough movement, I guess. It did work once moving, I could push snow over the bumper. I added it because I got it cheap. The dealer or whoever ordered it, thought it was good idea to have two open diffs on a truck with the off road package.

I’m pretty sure there’s no clutches in the one in my truck. It’s springs and weights I thought. Definitely doesn’t need an additive. I looked at it pretty close when it was out from exploding the spider gear.

 

[Bonnewagon]

Well then I could not use it, then if I detect anything I can always add it later. The only thing is that it works best in snow and that is getting rare here. So I guess I probably can do without it.

 

[olds307 and 403]

They do have clutches.
https://rover.ebay.com/rover/1/711-...0001&campid=5335822911&icep_item=264668269058