Does anybody know what weight oil and how many quarts I need for my rear diff. It is a 05 ranger edge and it has a open diff with the 7.5" ring gear and a 28 spline axle. Also do I want to run synthetic or dyno oil. I am installing a powertrax lock right 1830 and doing the rear disk brake mod. Also do you think because I am adding the locker I should use oil that is for a limited slip diff? Sorry for all the questions but I am at work and I no longer have a owners manual as it was stolen.

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Check with the locker manufacturer to see what the recommend for the locker. Thats what you'll want to run. If they say to use the normal fluid, then 75/90 gear oil is what you want. As far as dino oil v.s. synthetic, I personally prefer synthetic, and use Amsoil in my L/S 8.8 axle.

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Thanks, I will give them a call tomorrow. As for the amount of fluid is 2.5 quarts?????

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80w90 is the Ford spec. I run 75W90 Royal Purple full synthetic.

Synthetic oil has better cooling additives in it....and cooler gears are happy long lasting gears.

The amount of fluid....?? I honestly don't know. But my 31spline 8.8 totally dry too a full gallon of oil to fill. My spec said 3qts. Happy I got a gallon. Now....you've got alot smaller tubes and smaller diff. Honestly don't know the fill spec for 7.5's.

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'01 XLT disguised as a '03 Fx4 Level II.

Gotta love the fast responses, but do any of you guys know how many quarts I need? Sorry for all the questions, but my owners manual was stolen and autozone was useless .

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I've never filled a 7.5, took it out instead. But according to Ford (owners manual), it takes 2.5 quarts for a 7.5, and 2.75 quarts for the 8.8. My 8.8 took 3 quarts, and it wasn't quite topped off, but the fill spec is to .25" below the fill hole.

I'd say, get 3 quarts, and put them in. If it isn't running out the hole, you're good.

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Ford's Tech site says 5.0 pints which is 2.5 quarts on a 7.5 Ranger axle. I'd grab 3 and get a forth just in case. Take the extra one back if you didn't need it.


*Jbaum beat me. Send me some Shiner damnit!

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'01 XLT disguised as a '03 Fx4 Level II.

^^^ For that I would need an address and money......and motivation.


But I gotta tell you, this here ice cold Ziegen Bock in my hand sure does tate good!

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Thanks guy's you rock
Id give ya both a rep point, but looks like this site dose without.

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