diff oil - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1968CHEVYC10 · 04-28-2010, 05:08 PM

I tried the search button but nothing came up, so I thought I'd just ask. what oil is recommended for your differential? mine is an open diff with 373 gears, and I will be doing a good bit of heavy towing this summer if it makes a difference. thanks

bean · 04-28-2010, 05:30 PM

I literally just finished changing the oil in my 72. A multigrade, 80-140, will take care of it. I used a SWEPCO brand that is fantastic has moly in it as well.

cdowns · 04-28-2010, 05:46 PM

synthetic is bestest

i use royal purple or mbil one in everything i own//engine trannys and rears

Wrenchbender Ret · 04-28-2010, 05:49 PM

I agree with Bean. Any good gear lube with a GL5 rating will work fine. Some like the synthetic types but I don't think the added expense is nessesary & I like natural stuff.

**Stocker** · 04-28-2010, 07:32 PM

You'll get opinions all over the map... No doubt dino is perfectly acceptable (I ran it for many years without issues), but I now prefer synthetic 75W-90 (Mobil-1, and I have also used Redline). Valid or not, my perception is better flow, resulting in lower rolling resistance when cold, and better lubrication if very hot or at high pressures.

LONGHAIR · 04-28-2010, 07:40 PM

I am definately a believer in synthetics. They run much cooler, which is far better for everything inside the housing.

mclairmo · 04-28-2010, 07:41 PM

I don't like synthetic. It's unnecessary, costs too much and can lead to leaks. The synthetic has a bad habit of leaking out when there was no leak before.

capev86 · 04-28-2010, 07:46 PM

i have royal purple manual trans fluid in the saginaw (3onthetree) in my 72 burb 3/4 ton 2wd. going to put royal purple 75w-90 in the HO52 rear when i get the 4.10 swap done in the next couple weeks. fresh oil is better than nothing, but people don't realize how much heat/wear rear ends are subjected to and synthetic makes sense. mobil 1 and supertech (walmart brand) have cheaper synthetic gear oils but i'll be working my truck hard with trailer towing. it will be getting royal purple engine oil when i get the 406sbc swapped in but right now it has mobil 1 high mileage 10w-30 in the stock 74,000 original mile 307.

1968CHEVYC10 · 04-29-2010, 12:51 AM

thanks for the input yall, how much oil will go into these things?

cdowns · 04-29-2010, 04:52 AM

a bit less than 2quarts for a rearend

04-28-2010, 05:08 PM	#1
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	diff oil I tried the search button but nothing came up, so I thought I'd just ask. what oil is recommended for your differential? mine is an open diff with 373 gears, and I will be doing a good bit of heavy towing this summer if it makes a difference. thanks __________________ '68 C10 LWB 6.2NA/NP833 3.73's

04-28-2010, 05:30 PM	#2
bean Registered User Join Date: Jun 2002 Location: Fort Worth, TX Posts: 920	Re: diff oil I literally just finished changing the oil in my 72. A multigrade, 80-140, will take care of it. I used a SWEPCO brand that is fantastic has moly in it as well.

04-28-2010, 05:46 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: diff oil synthetic is bestest i use royal purple or mbil one in everything i own//engine trannys and rears __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-28-2010, 05:49 PM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: diff oil I agree with Bean. Any good gear lube with a GL5 rating will work fine. Some like the synthetic types but I don't think the added expense is nessesary & I like natural stuff.

04-28-2010, 07:32 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Re: diff oil You'll get opinions all over the map... No doubt dino is perfectly acceptable (I ran it for many years without issues), but I now prefer synthetic 75W-90 (Mobil-1, and I have also used Redline). Valid or not, my perception is better flow, resulting in lower rolling resistance when cold, and better lubrication if very hot or at high pressures. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

04-28-2010, 07:41 PM	#7
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: diff oil I don't like synthetic. It's unnecessary, costs too much and can lead to leaks. The synthetic has a bad habit of leaking out when there was no leak before.

04-28-2010, 07:46 PM	#8
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: diff oil i have royal purple manual trans fluid in the saginaw (3onthetree) in my 72 burb 3/4 ton 2wd. going to put royal purple 75w-90 in the HO52 rear when i get the 4.10 swap done in the next couple weeks. fresh oil is better than nothing, but people don't realize how much heat/wear rear ends are subjected to and synthetic makes sense. mobil 1 and supertech (walmart brand) have cheaper synthetic gear oils but i'll be working my truck hard with trailer towing. it will be getting royal purple engine oil when i get the 406sbc swapped in but right now it has mobil 1 high mileage 10w-30 in the stock 74,000 original mile 307.

04-29-2010, 12:51 AM	#9
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	Re: diff oil thanks for the input yall, how much oil will go into these things? __________________ '68 C10 LWB 6.2NA/NP833 3.73's

04-29-2010, 04:52 AM	#10
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: diff oil a bit less than 2quarts for a rearend __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY



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