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Old 03-17-2007, 11:04 PM   #1
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Default Chassis lube - Chevy Express

I went to a drive through oil change franchise today and asked that they lube the chassis.

Their computer said there were 12 lube points on my Chevy Express.

Anyone know if that's right?

In addition to the oil change I had the oil in the differential changed - they always up-sell me on something.
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Old 03-18-2007, 07:08 AM   #2
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Marco, you want to know about Chevy/GM, just ask me. I'm a GM geek, (besides working for them for 34 years). I'll do the best I can to answer the question.

The grease job zerk fitting number is about right. It should say or show the spots in your owners manual. You should be able to do this very easy maintenance item. Just takes a grease gun and some cheap rags.

The differential: Is yours a posi-trac? Does it have the G-80 option code. If it does, it's a posi. The diff fluid should have been changed initially at 5000mi. Then unless you tow regularly, at 75,000mi. It should have a good synthetic 75w-90 weight gear lube installed with either a G-80 or standard diff. Towing alot, it should be changed at 50,000mi intervals. Check your lube shop invoice to see what they used.

The trans. I wouldn't worry about until 50-60,000mi. unless you tow alot. You have a 4L80-E trans. The heaviest duty Hydramatic GM makes. There's one heavier duty, light duty truck trans. in GM's stable and it's the Allison 1000 5 & 6 spd. auto. It's used in GM's light & medium duty pickups with the 8.1 gas and the Duramax 6.6 diesel engines.
There's a new Hydramatic 6 spd. auto in a few current GM light dutys, but I won't get into it because it'll confuse you more.

Hope this helps a bit..........
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Old 03-18-2007, 03:07 PM   #3
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Thanks for the info

They used Esso Gear Oil LS 80W-90 GL-5 for the differential.

You're right about what's in the manual:

SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) or equivalent meeting GM Specification 9986115.

Would you change it out or leave it if it was your van?

I'm going to try to get an appointment at a GM dealer next week to have them check the transmission seals. The oil change place said it was leaking. (I also noticed oil on the ground where I park it)

I don't know if it is posi-trac. How can I find out? Where would I see the G-80 option code.

I do know that it came with "Locking differential & external transmission cooler".
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Old 03-18-2007, 04:44 PM   #4
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Check your passenger side front door rear edge. You should see a sticker with the codes. There will be many codes. They are almost all 3 digit codes in letters and numbers. They will be in alphabetical order.
G80 is the code for locking differential. If it doesn't have the G80 code it doesn't have the locker.
I thought all RT Chevys had the external trans. cooler and locker. At least since 2003.

If it was me, I'd make sure what they put in was synthetic. If not, go get your money back for that service since they didn't put the "required" fluid in, and I'd get it out of there before the next trip for sure.
Personally, I don't go near quick lube places or Wal Mart lubes. I've heard too many horror stories!
If I can help any more don't hesitate to ask.........
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Old 03-18-2007, 04:47 PM   #5
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My bad......I'm using the terms positrac and locking diff. GM's correct term is locking differential.
You've got G80 if you've got locking differential.
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Old 03-19-2007, 05:06 AM   #6
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Marco, one place where RT does a better job than PW in my opinion is the basic van from GM.

PW doesn't buy theirs with rear window defog, Locking diff, 4:10 gear or external trans cooler. I wish ours had all of the above. I feel that it's just that extra few things that makes the van more appropriate for heavier duty use.

PW orders theirs with the 3:73 axle. Fewer rpm's at highway speed, about 500 less at 60mph, maybe a slight bit better fuel mileage at the sacrifice of less low speed acceleration and more downshifting, (gear hunting), of the transmission at medium and highway speeds when encountering a slight hill. This last item just drives me crazy sometimes on highway trips. Up, Down, up, down the transmission goes in uneven terrain driving.
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Old 03-19-2007, 01:21 PM   #7
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I think the locking diff., 4:10 gear & external trans cooler became standard on Roadtreks in 2005.

It was optional on the 2004 model year.

I figured the 4:10 was mainly for towing and thought the 3:73 would save $$$ on fuel. I never thought about it downshifting more.
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Old 03-19-2007, 03:37 PM   #8
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Quote:
Originally Posted by markopolo
I think the locking diff., 4:10 gear & external trans cooler became standard on Roadtreks in 2005.

It was optional on the 2004 model year.

I figured the 4:10 was mainly for towing and thought the 3:73 would save $$$ on fuel. I never thought about it downshifting more.
Oh yeah! The Chevy pickup we had as a tow vehicle for our 5th wheel was the same way, especially when towing. They even had a software upgrade on that particular truck, both 8.1 gas and Duramax diesel to help cut down on that situation.

I made the mistake of ordering it with 3:73 vs 4:10. Now 4:10 is not going to eliminate the situation, but it sure will help cut down on it. Besides giving you better off line acceleration.
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Old 03-20-2007, 11:08 PM   #9
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I called the lube place re: the differential oil and they said to bring it back and they'll change it. - thanks for pointing that out bobojay.

I'm going to a Chevy dealer this week to get the transmission seals checked.
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Old 03-21-2007, 02:59 AM   #10
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Good. Like to help fellow GM owners...........
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