What Trans and Diff Oil?
The trans takes an ATF fluid. I run Royal Purple in mine, and I did notice an easier shifting. Call me crazy but before it was a little tough going from first to second, but after that it cleared it right up. Could have just been old fluid, who knows?
And the rear is a 140w-90? I think? dont quote me on that.
Do you have a limited slip in the rear?
And the rear is a 140w-90? I think? dont quote me on that.
Do you have a limited slip in the rear?
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Joined: Oct 2021
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From: Ketchikan
Hey all you gurus out there, just did a search on the forum about differential oil/lube. The Haynes manual states" Rear differential lube is API GL-5 SAE 90 Hypoid gear lubricant" Ive looked locally where I live and no one has that specifically. The Front Differential the Haynes calls for 80W90 gear lubricant, which I can get gallons locally. Napa has some 80W90 premium performance gear oil that states on the bottle " Is designed for a wide range of applications and is for use in non synchronized manual transmissions where GL-5 is specified and Hypoid differentials where API GL-4 or GL-5 is specified. Does this mean I can use the 80W90 in the rear differential? Haynes also says that a Traction Lock (limited slip) differentials need to add 4 oz of friction modifier XL-3 or equivalent when lubricant is changed, it does not specify front or rear for that note. So my question remains, can I use the 80W90 in the rear? and i dont know what limited slip is, or if I have it. I have a 02 Ranger XLT 4Wheel drive. I do know by the vin that it has 373 ratio for the gear ratios. Thanks a bunch. If you guys dont recommend using the 80W90 in the rear, can you shed some light on a possible supply for the SAE GL-5 90 Hypoid gear lube. Thank a million!
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Joined: Mar 2020
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From: US
Hey all you gurus out there, just did a search on the forum about differential oil/lube. The Haynes manual states" Rear differential lube is API GL-5 SAE 90 Hypoid gear lubricant" Ive looked locally where I live and no one has that specifically. The Front Differential the Haynes calls for 80W90 gear lubricant, which I can get gallons locally. Napa has some 80W90 premium performance gear oil that states on the bottle " Is designed for a wide range of applications and is for use in non synchronized manual transmissions where GL-5 is specified and Hypoid differentials where API GL-4 or GL-5 is specified. Does this mean I can use the 80W90 in the rear differential? Haynes also says that a Traction Lock (limited slip) differentials need to add 4 oz of friction modifier XL-3 or equivalent when lubricant is changed, it does not specify front or rear for that note. So my question remains, can I use the 80W90 in the rear? and i dont know what limited slip is, or if I have it. I have a 02 Ranger XLT 4Wheel drive. I do know by the vin that it has 373 ratio for the gear ratios. Thanks a bunch. If you guys dont recommend using the 80W90 in the rear, can you shed some light on a possible supply for the SAE GL-5 90 Hypoid gear lube. Thank a million!
those numbers can then be cross referenced to what you've got.
Typical Diffs need 75w140 in the rear & 75w90 in the front; with a little Tube of "FrictionModifier" added if they are LimitedSlip;
but read your OwnersManual for your specific vehicle. Read up or google on the difference between an "Open" & "Limited Slip" Differentials.
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Joined: Jun 2018
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From: Everett, WA
I'd have no problem using the Napa gear oil.
Owners manual for a 2002 Ranger available here
https://www.fordservicecontent.com/F.../02ranog4e.pdf
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Joined: Feb 2005
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From: Costa Mesa, CA
The 2002 owner's manual is not 100% correct. The 2002 FX4 with the Torsen in the rear differential has a tag that calls out for something like 75W-140 synthetic oil only. I doubt there are other exceptions though.
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