Rear end lubricant

[bob32268]

I'm putting a new (rebuilt) center section in my 69 Charger. The is an 8 3/4 Sure-Grip. 3:23, 489 case. What lubricant should I use; 90 weight, synthetic or what else? I know full well that I have to use a Friction-Modifier additive to
whatever I use.
Tks
Bob32268

 

[dadsbee]

Dinosaur 80W90 gear oil + the stinky stuff.

 

[bob32268]

Dinosaur 80W90 gear oil + the stinky stuff.
View attachment 1752430

 

[bob32268]

Thanks for the info, this was what I was planning to use, just wanted to make sure I was correct.
Tks,
Bob32268

 

[GTXDAN]

O'Reilly's has that exact bottle that @dadsbee posted for $12.

 

[davek]

Is this the Blue Room?

 

[moparwacko]

Is this the Blue Room?

Well, he did say "the stinky stuff"

 

[GTXDAN]

Maybe I posted the wrong stuff. Was it supposed to be this stuff.

 

[eldubb440]

unscented or lightly perfumed only

 

[bob32268]

O'Reilly's has that exact bottle that @dadsbee posted for $12.

There are no O'Reilly stores in my area, I went to the local Dodge dealer and got the MOPAR Limited Slip Friction Modifier, I'm sure this will work out OK.
Tks,
Bob

 

[GTXDAN]

I hear if you use this stuff you can park a Cadillac in a dog house.

 

[hunt2elk]

Cass aka Dr.Diff recommends SuperTech gear oil from Wally World along with a bottle of Ford friction modifier. That has always worked for me.

 

[rklewis1005]

Cass aka Dr.Diff recommends SuperTech gear oil from Wally World along with a bottle of Ford friction modifier. That has always worked for me.

Quick question. Do I need the Friction Modifier if mine is NOT a sure grip? I haven't opened it up yet, so I'm not sure, but it's on the to do list (reading / bookmarking anything relevant).

 

[hunt2elk]

Quick question. Do I need the Friction Modifier if mine is NOT a sure grip? I haven't opened it up yet, so I'm not sure, but it's on the to do list (reading / bookmarking anything relevant).

You don't need friction modifier if it is a one wheel peel.

 

[Macdon221]

80W90 gear oil. I use the ford friction modifier.

 

[rklewis1005]

You don't need friction modifier if it is a one wheel peel.

Thank you. Once I open it up this winter (down the list on rebuilds) I'll see what I have and decide on modifying it.

Is it possible/"relatively easy" to add Sure-Grip or other mods without changing the 8 3/4 axle housing?

 

[dadsbee]

Just jack the car up and rotate a wheel. Open gears the other wheel will turn the opposite way. Sure grip they'll both turn the same way.

 

[Slipping727]

I used this stuff. No additive needed