What lube do you use in your rear end? ;o) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

prostreetC-10 · 07-19-2011, 09:27 AM

Okay......jokesters welcome I guess!

Getting ready to drop the 3rd member into my 9" housing and was thinking about the gear oil and weight. I have quite a bit of left over Sta-lube that is rated at 80/90 GL-5 (whatever that means). It is a posi so I realize I will have to add a friction modifier. Is that the correct weight and does brand make THAT big of a difference?

Longhorn Man · 07-19-2011, 09:43 AM

I always recomend synthetic

**Stocker** · 07-19-2011, 10:09 AM

Synthetic here also.... doubt if brand matters, but for the record, I have Mobil 1 75W-90 in my Eaton diff. Have used RedLine 75W-90 in others, no problems.

prostreetC-10 · 07-19-2011, 10:15 AM

I've been reading some interested stuff on the internet. I'm seeing where guys are actually NOT using a friction mod in used rear ends with older clutch packs. They are saying the friction mod can cause the clutches to slip even more. I do understand the need for it on DD and other applications to the rear end won't pop and click around corners. This is going in a car that will see about 2 mile trips at a time. I am not concerned about the clutches because it will get a spool if and when this one goes out. Car will also see a little 1/8th mile track time. This car is ONLY for testing my Holley carbs and is in no way a cruiser or entended for any real street use.

07-19-2011, 09:27 AM	#1
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	What lube do you use in your rear end? ;o) Okay......jokesters welcome I guess! Getting ready to drop the 3rd member into my 9" housing and was thinking about the gear oil and weight. I have quite a bit of left over Sta-lube that is rated at 80/90 GL-5 (whatever that means). It is a posi so I realize I will have to add a friction modifier. Is that the correct weight and does brand make THAT big of a difference? __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

07-19-2011, 09:43 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: What lube do you use in your rear end? ;o) I always recomend synthetic

07-19-2011, 10:09 AM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Re: What lube do you use in your rear end? ;o) Synthetic here also.... doubt if brand matters, but for the record, I have Mobil 1 75W-90 in my Eaton diff. Have used RedLine 75W-90 in others, no problems. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

07-19-2011, 10:15 AM	#4
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: What lube do you use in your rear end? ;o) I've been reading some interested stuff on the internet. I'm seeing where guys are actually NOT using a friction mod in used rear ends with older clutch packs. They are saying the friction mod can cause the clutches to slip even more. I do understand the need for it on DD and other applications to the rear end won't pop and click around corners. This is going in a car that will see about 2 mile trips at a time. I am not concerned about the clutches because it will get a spool if and when this one goes out. Car will also see a little 1/8th mile track time. This car is ONLY for testing my Holley carbs and is in no way a cruiser or entended for any real street use. __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!



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