7.5 Open Rear End - What fluid?

[arownious]

Changing out my differential fluid shortly and need some official call on fluid type. My Hayes says ATF for a transfer case, but mine is a 2wd, and it doesn't specify for the differential.

Autozone doesn't have record of it either. The Ford 150 site says the synthetic 75w90 works great for Ford rear ends, but the rangerstation tech page says hypoid gear lubricant SAE 80W or 90W (whatever a hypoid is).

Can anyone give me a ya or nay on which lubricant I should use for the differential only?

ATF mercon VI or Mobil 1/Valvoline 75w90 synthetic gear oil?

 

[pcollins]

I put hypoid gear lube in mine. the SAE 80w-90. or 75w-80. it HAS to be hypoid. it has anti foam and high pressure additives. now if you have a locking/posi differential. then the fluid is different as well.

 

[PlumCrazy]

80w-90 for open and 75-140 synthetic for Trac-Loc

-PlumCrazy

 

[MountainMike]

80w-90 for open and 75-140 synthetic for Trac-Loc

-PlumCrazy

CXY-80W90-1L at your neighbourhood ford store

 

[arownious]

Where can I buy any of this stuff? Must I go to Ford?

Would Lucas from Advanced Auto Parts work?

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_SAE-80W-90-Gear-Oil-Lucas-Oil-Products_7070041-P_N3242_T?cm_mmc=CSE-_-Google-_-VALUE3-_-VALUE4&ci_src=14110944&ci_sku=7070041

 

[arownious]

NM i found it. Ford dealer says Mobil 1 Synthetic 75w-90 is fine for the gear box calling for 80w-90.

http://www.amazon.com/MOBIL1-GEAR-LUBE-75W-90/dp/B002OQ12TG

This is the stuff I can find locally.