zeekstr

Which Gear Oil Do You Use? Do you also use the friction modifier
if the manufacturer states it is in the oil? Also, are you installing
a gasket or using silicone sealant?

Chadwick86

I used 2 bottles of Royal Purple 75w90. It has friction modifier mixed in (two birds, one stone) . For a gasket I used copper seal from Permatex, not sure if its the best/right stuff, but it hasn't leaked.

94RedDevil

I agree, royal purple is the way to go. It isnt exactly cheap or easy to get your hands on locally, might have to go through summit or jegs, but you pay a price for quality

Timspony

and we have a winner ^^^^ ...Royal Purple! ...I also use the hi-temp silicone to button up!

mjr46

right now I have royal purple in mine but in the near future will switch out to amsoil

QuarterHorse00

I use Valvoline 75w90 with a tube of friction modifier. I seal the diff cover with "The Right Stuff".

FORD TOUGH

I use carquest 75w90 with the friction modifier. I prefer to use a gaskets because you do not have to wait for the silicone to dry before putting fluid in.

zeekstr

Very good. Now the next question:
Why do you use the brand you stated? Do you use it because...

Good advertising
Word of mouth
It is expensive and you have extra $$$
It is local and you hate spending lots of cash in shipping costs

Portmaster

Mobil1 75w140 syn with 4 oz XL-3 Friction modifier. Permatex Ultra Red RTV

nasty90

Royal Purple ftw, only because the dude at jegs told me too. and i always use a fel pro gaskett. he told me that to.