Stroked91

im getting ready to install gears on my car but not sure what weight gear lube would be best. plus i want to know sincve im rebuilding my trac lok and i know you have to soak the clutches in the modifier but should i put the whol dif in a thing a lube while its waiting to get installed

cleanfitty

I use 80-90, but alot of guys seem to run 75-90 (I think). I just found the ford spec number for diff fluid and the only one that matched was the castrol hypoy c that i found at Pep ******. (Its a 80-90) and you'll need a bottle of friction modifier (Ford). When soaking the clutches, mke sure they are seperated while soaking them. Do not assemble them and then soak them.

Stroked91

yea i was gonna soak them first but i plan on using red line synthetic gear lube but didnt know what wieght to use

Ninety5five0

Get some royal purple 80-90

If you dont use a fluid that has the additive already in it, you need to use the special additive...I forget what its called...

Lucas has it in it already, thats what i used.

Stroked91

so i guess 80w90 is the wieght to go with thanks for the info

PRO50SC

This is what you need. Already has friction modifier in it. 3 Bottles
http://www.royalpurple.com/gear-oil.html

Stroked91

what wieght would u recommend cause im also being told to use 75w90 na dhas anybody on here used the blue oval industrieds subframe connectors or the ones from mustangsunlimited

PRO50SC

There's not going to be much difference between the 75/90 and the 80/90. If you look at their tech page, there's almost no difference. I would use the 75/90 It's really preference at this point

http://www.royalpurple.com/gear-oil-pp.html

Stroked91

thanks for the info so 80w90 it is again lol