Transfer Case Fluid? Quick Answer Appreciated!

[BronCowie]

Urgent Question

My Bronco is in a local family owned transmission shop having my C4 rebuilt. In their research they think they know what fluid should be in there, but want confirmation... I have no idea.

What type and weight should be in my Dana 20 transfer case?

 

[NC-Fordguy]

I've been running 80/90w for years on several broncos

 

[BronCowie]

Thanks bud. In my quick research here anything from 50w to 140 works. seems like 80/90 might be a good choice.

 

[sykanr0ng]

Thanks bud. In my quick research here anything from 50w to 140 works. seems like 80/90 might be a good choice.

80/90 gear oil is about the same viscosity as 50 weight motor oil, that causes a lot of confusion.

 

[BronCowie]

80/90 gear oil is about the same viscosity as 50 weight motor oil, that causes a lot of confusion.

Thanks for the clarification. I'm going with 80/90.

 

[Boss Hugg]

I've got 50w in mine, and from the moment I filled it the first time it had a drip the next day. With 80w90 that shouldn't be a problem.

 

[sprdv1]

I've been running 80/90w for years on several broncos

Same here from my experience, questioning as well...

 

[sprdv1]

Thanks for the clarification. I'm going with 80/90.

Good call...

Just actually drained, reloaded mine w/the same before OCBR