I have decided I am probably going to replace my rear diff fluid this weekends. Had a couple questions...

What type of gear oil to us? 75w-90?

How Many Quarts?

How do I know if I have LSD?

 

2qts per diff (actually takes less, just fill to a bit below the plug)

check your manual for the weight

jack up the rear end and try to spin the tire on one side, if the other side spins the same way then you have LSD, if it spins backwards, you have an open diff.

 

LSDs require a friction modifier to be added to the differential fluid (it only takes 4oz of friction modifier and it's about $5). The differential fluid is 75W-90. I personally use Mobile-1 LS 75W-90

 

That is exactly what I was going to use Dom...10 bucks a quart..now to see if I have LSD

 

75w-90 and you can go with the mobil 1 or royal purple. I went with royal purple and never added the modifier. Havent had any problems in 6 months.

 

simple fact is if you want your limited slip to last a long time you gotta treat it right... so if you have a lsd put in the friction modifier.

 

+1 srch, even if he fluid claims to be compatible w/o additives it usually isnt.

 

I go by specs, idc what fluids say. Mobil 1 will be ill look at the gear oil, will look at friction modifiers later, going to try to enjoy the outdoors today, it is like 65 degrees at 11am!!!!!

Might hit 75-80 today..only to go back to 30 degree highs for the first time this winter next week

 

Great weather around here too. Sorry i just like to follow the advice i give but yes you should probably add the modifier. I was going to do it but never got around to it and just skipped it.

 

Makes me want to move south