5spd Trans H190 diff

[JC87HB]

What type gear oil/lubricants do i need for these? i do not know wen the last time my truck had those changed but i havent done them so i really want to do them soon just need to know what i need for the job! thanks guys!

[Desert Rat]

The trans requires GL4 only. Don't get replacement oils that say GL4, GL5, etc. It has to be specifically GL4. Don't let a parts store counter guy tell you any differently. Napa sells GL4 dino oil in 2 qt jugs, and many speed shops will sell it in synthetic.

For the rear diff, standard 75w90 or 80w90 gear oil will be fine. You can get that at any parts store.