When i change the fluid out do i need to add that additive to the oil as well? The manual says if you have a limited slip diff to add it but how do i know if i have limited slip?

 

looks for g80 in glove box

 

What year/size truck? 1/2 tons with the 8.5" 10 bolt and RPO G80 Gov-Lok don't need the friction modifier additive.

 

maybe a dumb question...... where in the glove box? I can't find any codes. I could be blind though lol

 

Brake stall to about 3000rpm and let the rubber burn if only one wheel spins and smokes you dont need the additive

 

That is one way to find out!

 

Say what? lol...beg to differ friend. I work at a dealership and I know to be fact, that if you got a Posi Trac (G80) you DO have to have the Limited Slip Additive.

My truck right now is popping and jerking because I didn't add enough additive.

If you have a locker.....you should use the Additive.

 

I thought the additive was only for the clutches? I believe the G80 does not have any clutches in, hence no additive. Someone correct me if I'm wrong.

 

ahhh a stock truck isnt going to stall to 3k...

 

Not trying to be a dick, but I've heard that before from dealership employees, BUT the shop manager assured me that the G80 in my ZR2 did NOT use the additive. It was the same 8.5" 10 bolt that's in the full-size trucks. This debate's been going on for years over on ZR2.com.