Rear diff oil capacity…at 3.2qts?

[Hollowdweller]

You are filling up the differential and both axles.

Yes…I believe so. I’ve seen posts online and a few guys telling me that it might take more to fill up both but no solid numbers…seen 1.7 to 2.5, sometimes 3 depending on diff cover but that’s usually on threads involving gear swaps, not really complete housing removal.

Dude, you can't put that much oil in there without it flowing out of the hole. Quit using the hole on the cover and pull the plug on the front of the diff. I guarantee you you wont get to even 4 qts. Have you even located the right fill plug?




Do you see how low it is on the housing, it's at about the center of the axles. Pull this plug and fill it through the cover. As soon as it starts to come out of the FRONT hole you're done. It's about as basic a process as you can have. Or just put in 2 qts and 4 oz of friction modifier and send it if you can't figure out how to check it properly.

And don't ever go back to that shop again. They're idiots.

Look, it's over filled now. Just pull that front plug and let it drain out till it stops, then put the plug back in and go.

Yes I know which hole you’re talking about but no I haven’t personally checked that hole. I took it to a shop today and they reassured me they were checking the hole on the housing. I 100% expected them to tell me oil poured out everywhere, I was blown away when I heard him scream LOW from under the car. I confirmed again that they were checking the hole on the housing and the guy said yes. I believe you, I 100% agree with you, everything is telling me you’re correct….but WTF??? I’ll run it to a different shop tom to confirm…I couldn’t get out of the car at the one I went to today. You think you’re frustrated…ugh lol

 

[JC SSP]

You should have read my post #2. You have a larger cover so it will take a little more fluid but the end result for measuring is the same…

 

[Hollowdweller]

You should have read my post #2. You have a larger cover so it will take a little more fluid but the end result for measuring is the same…

I did pimpin!! Got to looking around at “ oil capacity with FRPP cover” but never got a specific amount. One guy with my cover stated 3.5qts on complete refill….?

 

[crjackson]

.

 

[07 Boss]

I have to correct myself. I forgot when I put my FRPP cover on I had to add about 1/2 qt for me to reach the right level. My oil level was just below the fill hole with 2.75 total qts. and the FRPP cover. The important thing when filling your rear end is to make sure the axles get lubed. For the gears themselves, the level is not that critical. As long as the gears are running through the oil it will lube the entire rear end. Just have to get the level to keep the axles lubed. I wonder if the type of rear end makes a difference? I mean I have an Auburn Pro diff and with the FRPP cover and I never got to 3 qts. Maybe the traction lock displaces less so it may take more to fill it to the proper level. IDK, I'm just trying to figure out how you are getting so much oil in there without it overflowing.

 

[Autokyrios]

That cover won't significantly increase the amount of fluid. A little, but not a lot. It's main purpose is strengthening the diff.

5 pints is about 2.5 quarts.

It really isn't a lot of fluid. I have a built rear-end with larger axle tubes and such and it only takes 3 quarts.

The aftermarket girdle's upper hole is for filling (putting fluid in, NOT measuring) and can be used for aftermarket diff cooler pump plumbing. The lower smaller hole is purely a drain. There's an untapped boss near the lower center that can be drilled/tapped for a temp sensor or diff-cooler plumbing. That's all those ports are for.

Put the car on level with the axle at the proper pinion angle (normal ride angle). Take out the forward (driveshaft-side) plug. Put the friction modifier in, then pump in diff fluid (through same hole or the girdle filler hole) a little at a time until it flows out (which would mean its level with the forward, driveshaft-side, hole). Plug. Move on.

If you haven't messed with the gears, you don't really need to do a fluid break-in, but you can.

 

[JC SSP]

FYI friction modifier is only needed with factory style clutch pack LSD. If you have a different aftermarket LSD you won't need this additional friction modifier. It doesn't hurt anything; it's just not required for proper operation.

In fact, most aftermarket lubes already include a friction modifier in the gear lube, but I still suggest adding the little bottle of Motorcraft friction modifier (smells like hell!), especially if you have a clutch-pack LSD

 

[skwerl]

FYI friction modifier is only needed with factory style clutch pack LSD. If you have a different aftermarket LSD you won't need this additional friction modifier. It doesn't hurt anything; it's just not required for proper operation.

In fact, most aftermarket lubes already include a friction modifier in the gear lube, but I still suggest adding the little bottle of Motorcraft friction modifier (smells like hell!), especially if you have a clutch-pack LSD

Actually it smells like boiled ass. I had a bottle of that once, opened it but didn't use it. I ended up having to double bag that bottle in two zip lock bags just to keep it in my garage! That shit will make a skunk smell good.

 

[Pentalab]

FYI friction modifier is only needed with factory style clutch pack LSD. If you have a different aftermarket LSD you won't need this additional friction modifier. It doesn't hurt anything; it's just not required for proper operation.

In fact, most aftermarket lubes already include a friction modifier in the gear lube, but I still suggest adding the little bottle of Motorcraft friction modifier (smells like hell!), especially if you have a clutch-pack LSD

Not used on an Eaton TRU-trac LSD. Only 75W-140 plane jane gear oil.

 

[Autokyrios]

Trying to find in the OTP the model of the differential.

Assumed it was stock.

Adding friction modifier to a diff that shouldn't have it is not great.

 

[Hollowdweller]

Got it fixed up!!! Took it to a different shop, watched them pull the correct plug, and then watched $$ go in the pan lol. It wasn’t as much as I thought really but it immediately started running outta the housing fill/check hole. Sweeeeeeet, thanks everyone!! I know it’s frustrating to help sometimes lol but when your learning and there’s tons of info on the web, it gets confusing

 

[07 Boss]

Glad you got to the bottom of it. That first shop was a joke to tell you it was low when it was in fact overfilled. That told me a lot. And that they said they used the proper hole to check the level after you put more than 4 qts in there told me they didn't know what they were doing. That's why I was insistent you check it your self properly. Either way, avoid that shop and happy cruising.

 

[bambam 06]

Glad you got to the bottom of it. That first shop was a joke to tell you it was low when it was in fact overfilled. That told me a lot. And that they said they used the proper hole to check the level after you put more than 4 qts in there told me they didn't know what they were doing. That's why I was insistent you check it your self properly. Either way, avoid that shop and happy cruising.

I wondered what kind of shop that was, when they raised your car with you in it, rather than let you see what they were doing!!