Is redline mtf 90 fine to put in my transmission with a cusco lsd? I didnt buy the lsd so im not sure what was told to put in it?

 

Is it a metal plate style LSD? If it is that mtf 90 may work but the diff might be noisy.. In mine I run Motul FFcomp works great when the tranny is warmed up, but its clunky when it's cold.. Torco makes some that is classified GL6 and I wanny try it next oil change -plus its a lot cheaper than the Motul fluid..

 

i just talked to the previous owner i guess hmotors told him to run a 80 weight gear oil.

 

Run a good MTF (Torco, Amsoil, GM, Redline etc) and add some Type-F (Ford) friction modifier.

Do not run the Cusco Gear Oil, or any Gear Oil for that matter.