Yes, a Dumb Question: Rear Diff Fluid

[Scram1500]

I’m happy to report I completed the fluid flush and fill for the rear diff….was scared out of my mind doing it, have no idea why (maybe because this was the first ever time I did it). Had to run to auto store in the middle of it to get fluid transfer pump because my squeeze bottle idea didn’t work (and they didn’t have the squeeze bags of fluid available). Those things work awesome, pushed in a quart of oil in no Time.

The bad: mine was way low From factory. Fluid didn’t even flow out of the fill plug when I removed it. Stuck my finger in and nothing. Disposing of old fluid, I didn’t even get a total of 2 qts and a smidge and a half more (maybe 2.1 quarts). No metal on the plugs. Fluid looked like mud.

The good: refilled it until it flowed out of the fill plug with high quality Amsoil with the Mopar friction modifier. I did my best to get the 5 oz of the friction modifier, so it might be a small +or- margin of error.

Took it for a 10mi round trip ride to get gas and it seemed like it didn’t have the hesistation it used to. Pretty smooth too. I didn’t hear any noise, but I have no idea what I’m listening for anyways if anything was bad. Also checked at the gas station and didn’t see any leaks From underneath.

Only question I had was about the thread sealant: I used the Permatex high temp thread sealant, but the stuff that squeezed out didn’t seem to Dry. Does the stuff ever dry and harden to make a seal? Also, is there a torque spec for those plugs? Or is it the same as an oil plug, don’t tighten the crap out of it?

Manual states 5 oz of friction modifier but it's sold in 4 oz bottles?

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[cervelo15]

Manual states 5 oz of friction modifier but it's sold in 4 oz bottles?

Mopar Replacement 04318060AD Mopar Replacement Limited Slip Additive Friction Modifier Lubricants | Summit Racing

Free Shipping - Mopar Replacement Limited Slip Additive Friction Modifier Lubricants with qualifying orders of $109. Shop Friction Modifiers at Summit Racing.

www.summitracing.com

Yeah I did see that in other threads, lots of guys asking Why they couldn’t sell it in a 5oz bottle already. I thought the same, but was glad to buy a second bottle to make sure to have extra on hand in case I messed it up.

 

[klotz50]

I’m happy to report I completed the fluid flush and fill for the rear diff….was scared out of my mind doing it, have no idea why (maybe because this was the first ever time I did it). Had to run to auto store in the middle of it to get fluid transfer pump because my squeeze bottle idea didn’t work (and they didn’t have the squeeze bags of fluid available). Those things work awesome, pushed in a quart of oil in no Time.

The bad: mine was way low From factory. Fluid didn’t even flow out of the fill plug when I removed it. Stuck my finger in and nothing. Disposing of old fluid, I didn’t even get a total of 2 qts and a smidge and a half more (maybe 2.1 quarts). No metal on the plugs. Fluid looked like mud.

The good: refilled it until it flowed out of the fill plug with high quality Amsoil with the Mopar friction modifier. I did my best to get the 5 oz of the friction modifier, so it might be a small +or- margin of error.

Took it for a 10mi round trip ride to get gas and it seemed like it didn’t have the hesistation it used to. Pretty smooth too. I didn’t hear any noise, but I have no idea what I’m listening for anyways if anything was bad. Also checked at the gas station and didn’t see any leaks From underneath.

Only question I had was about the thread sealant: I used the Permatex high temp thread sealant, but the stuff that squeezed out didn’t seem to Dry. Does the stuff ever dry and harden to make a seal? Also, is there a torque spec for those plugs? Or is it the same as an oil plug, don’t tighten the crap out of it?

Am doing my 2019 with 80k this week. I got the valvoline 75-140 and just notice it said it had modifier in it already. Did you ever get a solid answer on adding the 5 oz since Valvoline has it in it already? Also, realize this is late but yes both drain and fill plugs have torque specs.

 

[Snekpete]

Am doing my 2019 with 80k this week. I got the valvoline 75-140 and just notice it said it had modifier in it already. Did you ever get a solid answer on adding the 5 oz since Valvoline has it in it already? Also, realize this is late but yes both drain and fill plugs have torque specs.

If you have a limited slip rear differential add the modifier on top of the Valvoline mod. If you have an electronic locking differential do not add modifier.