What engine oil and gear oil? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KD4UPL · 11-11-2012, 06:46 PM

I recently got a '69 C10 from my grandfather. It's got a '71 307 and a TH-400. The rear axle is a '70 12 bolt. It appears to have a posi and about a 3.24 gear.
The truck runs pretty good. I want to go over everything before I run it much.

What engine oil does this engine need? I'm guessing 10w-30 but I'm not sure. Also, what gear lube for the rear axle? Do I need some kind of additive for the posi? I'm pretty sure the trans just needs good old Dexron III.

**truckster** · 11-11-2012, 07:04 PM

I run 10w-30 year round in mine, and temps go from around 0 to 100+. For gear oil I use 75w-90. You need a friction modifier for posi. The trans will work fine with any Dexron; the later formulations are engineered to work in earlier applications.

KD4UPL · 11-11-2012, 07:30 PM

One more question, what spark plugs should be in this engine? I could just get new replacements for the Champions that are in it but I have no idea if they are correct or not.

SS Tim · 11-11-2012, 08:45 PM

Might want to take a look at this thread, the manuals and a handbook are a great start.

http://67-72chevytrucks.com/vboard/s...d.php?t=544915

**Stocker** · 11-11-2012, 08:52 PM

I also run 10W-30 (dino) all year and 75W-90 (synthetic) in the diffs. My Clymer shows AC R44 for a '71 307. As for brand, I've had good luck with AC Delco and Autolite, not so good with Champion.

**Stocker** · 11-12-2012, 05:58 PM

Quote:

Originally Posted by Stocker

My Clymer shows AC R44 for a '71 307.

Ah shoot, I looked at the wrong model year 307, sorry. The correct AC# for a '71 307 is R45TS.

**truckdude239** · 11-12-2012, 06:08 PM

R45TS gaped at .035 for points .045 for hei run the ac delcos and save your self alot of problems

11-11-2012, 06:46 PM	#1
KD4UPL Registered User Join Date: Jun 2012 Location: Swoope, VA Posts: 17	What engine oil and gear oil? I recently got a '69 C10 from my grandfather. It's got a '71 307 and a TH-400. The rear axle is a '70 12 bolt. It appears to have a posi and about a 3.24 gear. The truck runs pretty good. I want to go over everything before I run it much. What engine oil does this engine need? I'm guessing 10w-30 but I'm not sure. Also, what gear lube for the rear axle? Do I need some kind of additive for the posi? I'm pretty sure the trans just needs good old Dexron III. __________________ 1987 S-10 Blazzer Sold, 1986 GMC Jimmy Sold, 2002 Chevy 2500 HD 2wd, 6.0, auto. Sold, 2007 Chevy 3500 SRW 4wd D/A Sold, 2005 Chevy 3500 4wd CC, D/A, dually, 2001 Chevy 3500 4wd EC, 8.1/A dually, 1969 Chevy C10 short bed, 307 V8

11-11-2012, 07:04 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,796	Re: What engine oil and gear oil? I run 10w-30 year round in mine, and temps go from around 0 to 100+. For gear oil I use 75w-90. You need a friction modifier for posi. The trans will work fine with any Dexron; the later formulations are engineered to work in earlier applications.

11-11-2012, 07:30 PM	#3
KD4UPL Registered User Join Date: Jun 2012 Location: Swoope, VA Posts: 17	Re: What engine oil and gear oil? One more question, what spark plugs should be in this engine? I could just get new replacements for the Champions that are in it but I have no idea if they are correct or not. __________________ 1987 S-10 Blazzer Sold, 1986 GMC Jimmy Sold, 2002 Chevy 2500 HD 2wd, 6.0, auto. Sold, 2007 Chevy 3500 SRW 4wd D/A Sold, 2005 Chevy 3500 4wd CC, D/A, dually, 2001 Chevy 3500 4wd EC, 8.1/A dually, 1969 Chevy C10 short bed, 307 V8

11-11-2012, 08:45 PM	#4
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,504	Re: What engine oil and gear oil? Might want to take a look at this thread, the manuals and a handbook are a great start. http://67-72chevytrucks.com/vboard/s...d.php?t=544915 __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

11-11-2012, 08:52 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,497	Re: What engine oil and gear oil? I also run 10W-30 (dino) all year and 75W-90 (synthetic) in the diffs. My Clymer shows AC R44 for a '71 307. As for brand, I've had good luck with AC Delco and Autolite, not so good with Champion. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

11-12-2012, 06:08 PM	#7
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: What engine oil and gear oil? R45TS gaped at .035 for points .045 for hei run the ac delcos and save your self alot of problems __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube



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