What grade of oil to run in Tcase

[snowplow]

What grade of oil do I run in my topshift tcase for best results? Is synthetic ok?

thanks dudes

[jimbo74]

i am weary of running synthetic in anything that has high miles or has a leak... it will leak like crazy.... todays synthetics are a lot better than years past though, and msot will be ok....

personally, i run regular gl4 dino oil..... i run gl4 because that is what i run in the tranny, as gl5 can shorten the life of the tranny

[79coyotefrg]

Marlin recommends 80-90 GL5

[snowplow]

thanks dudes