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I'm looking to redo all fluids in my 76 f250 4x4. I've looked into MT-90 75W90 GL-4 by Redline for fluid and it says not for hypoid gears. Trying to google of hypoid gears is is only kind of helpful but doesn't tell me direct answers enough to make me confident where to use it. I have the np435 trans, np205 transfer case and Dana axles (not precise on which ones, just know HD with locking hubs). I'm only assuming my front and rear axle would be hypoid but more insight would be great. Where do I have hypoids and non-hypoid gearing where I need to find different fluid
To my understanding of hypoid, there are no hypoids in the NP435 or NP205. Your Dana axles do have hypoid ring & pinions, just as the 9" does. The 9" has more of a hypoid distance, so it's more critical to use a hypoid oil in it.
To my understanding of hypoid, there are no hypoids in the NP435 or NP205. Your Dana axles do have hypoid ring & pinions, just as the 9" does. The 9" has more of a hypoid distance, so it's more critical to use a hypoid oil in it.
Awesome, I appreciate it. So hypoid is a fancy words for ring and pinion gears then?
They are all right on the gears and oil needed where.
I use Red Line MT 90 in my NP435 and Advance Adapters Range splitter over drive.
The Red Line was the only lube I could find that was GL-4 and safe to use with yellow metals.
Store bought gear lube is GL-5and not safe with yellow metals.
Some say there is no issues running GL -5. That might be so but I am not going to risk in in my transmissions.
It is also the ONLY lube the over drive unit should run as it came with the unit.
Dave ----
Ah I see. Thanks fellas. I just know the front and rear axle are Dana's but need to look into IDing them. I wasn't aware there were aftermarket or upgrades for the np435 or np205. I'm not very affiliated with those areas
Actually, "Hypoid" doesn't mean the gears are curved and beveled. Curved beveled gears are a necessity of, not the reason for, the name hypoid. A hypoid setup is simply when the axis of one gear, does not intersect the axis of it's partner gear. Below is an example of that. Dana 60 and Ford 9"
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