Has anyone used the GL-5 Pennzoil gear oil in their differentials? It is available locally at Wal-Mart. They also have a synthetic version but I am not sure if Wal-Mart sells it.

 

Personally, I have redline in mine. The book specifies full synthetic GL-5 75W-90, so I don't think I wouldn't run a non-synthetic.

 

My first oil change on the diffs was with the Penzoil 75w-90 synthetic. It was not what I wanted but was all I could find at the time. It does meet the requirements as it is a GL-5 synthetic.

 

I wanted to find something locally. It's been raining here what seems like every day this month and we can't get in the hay fields. I changed the tranny oil yesterday and I thought the diffs would be a good project for today. A drive to the parts store would let me know if the 6-speed is shifting smoother.

 

N5, go to any pep boys or autozone and pick up some Mobil 1 gear lube. I can't imagine finding syn lube locally is that difficult. Don't bother putting in dino lube.

 

Did mine 2 weeks ago and used Royal Purple 75-140. I got it at NAPA for 8.32 a quart. It's alittle pricey but well worth it in my opnion.

 

Why did you ignore the recommended wieght and go with 140?

 

Actually, I have 75W-140 in mine also, only Redline.

I went to the Dodge dealer, figuring I would get DC stuff if it wasn't too expensive, and the parts guy brought up that they also sell redline.

He also told me that they are recommending 75-140 if you do any heavy towing, and that it won't void the warranty (even though the book says 75W-90). He's running that in his personal truck.

Mainly, I wanted to make sure the warranty on the dif. would still be in effect, and a little extra margin of protection couldn't hurt.

It's been in about 7k with no problem.

P.S. They also changed the oil level in the 11.5" rear end to 3/4" to 1 1/4" below bottom of fill plug, which is different from what the book says that came with early 03's.

 

My truck has the 10.5 rear end. Iwant to change out oil this week end. Could someone tell me how many quarts I will need? Thanks in advance
Frank

 

The book says 4.75 pts, nominally.

 

Is that qts or pts? I just want to buy enough oil when I go to the parts house. I am about 20 miles from nearest Store. 10.5 aam rear end capacity.

 

4.75 pints, or; 2.25 Liters for those metrically inclined.

3 quarts should do it.

When I did my truck, the diffs and transmission cases took what the book said they would, but my xfer case took a little more than what the book said.

 

Jeff in TD

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I went to the Dodge dealer, figuring I would get DC stuff if it wasn't too expensive, and the parts guy brought up that they also sell redline.

End Quote

How much was the factory oil?
Thanks

 

RankRam, shoot, I don't recall.

 

Thanks anyway!