Dana 70hd fluid recommendations

[Cainon]

Any recommendations for fluid to use in a dana70HD?

 

[u2slow]

I use basic 80W90 in everything.

 

[Cubey]

Open or limited slip? I ran the cheap stuff from Walmart ($15/g) in my 27ft RV with a reusable diff cover gasket because it was so neglected and I knew it would need several oil changes to clean it up. It lacked limited slip, so no additives were needed. 75w140 or something like that, but I stay out of very frigid places and it was always under a heavy load.

 

[Booyah45828]

Synthetic or conventional any gl5 75w90 or 80w90 will work. If you're towing a lot or heavy like an rv, you can use a 75w140 instead. Use a bottle of friction modifier if you have an lsd, even if it says it's added already in the fluid you choose.

They're not too picky in my experience, just check/change it every now and again when it starts to look bad.

 

[Black dawg]

Heavy high speed towing, 75/140 syn
Extreme cold, like consistent negative temps, 75/90syn
Regular all around use, regular 80/90w is just fine.

No downside to the synthetics other than cost.

 

[typ4]

SYN 75/140 for me as we dont get wicked cold.

With additive for extra insurance.

 

[u2slow]

It is my experience that leaving out the friction modifier helps get some grip back (used trac and powr loks). Been doing so for 20 years.