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Old 10-22-2006, 06:00 PM   #1
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3.73 0k?

I want to own a 25-28ft Classic someday. Since the 8.1 is not available in the 2007s, I have found a 2005 Suburban 2500, 14,600 miles, 8.1. It has the 3.73, not the 4.1.

Will that TV be ok for that A/S?

We are going to look at the Suburban tomorrow-it is 120 miles from us. If you say it won't work, we will not go!

Thanks in advance. I do want to do this only once, so it is very important to get it right.

Pat
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Old 10-22-2006, 06:09 PM   #2
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You will be absolutely fine with the 3.73.
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Old 10-22-2006, 06:13 PM   #3
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I would agree. One can split hairs but this 'burb will work just fine. The 8.1 has muy plenty of torque. Consider that the Duramax-Allison combination is available in only a 3.73 rear end. Enjoy!
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Old 10-22-2006, 06:21 PM   #4
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Thanks!

Thanks for the quick replies! It's off to see the Burb! Will let you know tomorrow if it is in the drive.

Pat
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Old 10-22-2006, 08:25 PM   #5
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IMHO the 3.73 gear ratio will be fine. But aware that the 8.1 Liter engine uses a bit more gas than the 6.0L engine. Thats about one liter per cylinder.
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Old 10-22-2006, 08:37 PM   #6
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Hi All...just a follow up question...would the above "thumbs up" hold true for an Suburban 2500 with 8.1/3.73 if you wanted the flexibility to tow say 30' to 34' Airstreams? If not would it work if you changed rear end ratio to 4.xx IF you ended up with say a 34' AS?

Just curious?....Tom R in Two Harbors, MN
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Old 10-22-2006, 09:40 PM   #7
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I can attest that the 3.73 rear works great. I am pulling an '05 Safari with an '05 Suburban 4x4x4 (four wheel drive/Quadrasteer) 2500 with the 6.0 liter gasoline V-8. We have pulled about 10,000 miles this years including an extensive tour of New England with quite a bit of mountain driving. I am very satisfied with the performance.

As to a 34', I think it would work, but I would opt for a Sierra or Silverado 3500 (non-duely) with the 8.1 (still available in the pick-ups) with the 4.11.
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Old 10-22-2006, 10:29 PM   #8
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Hi, 3.73 seems to be the universal differential ratio that comes with the tow package on most vehicles. A lower ratio, like 4.10 might pull better and use more fuel at the same time. Where as a higher ratio like 3.55 would more than likely lose power and mileage.
Now to confuse the confused; A higher numeric ratio, gears you lower, and a lower numeric ratio, gears you higher.

Bob
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Old 10-22-2006, 10:37 PM   #9
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Hi starflyte1--The 3.73 rear with the 8.1 ltr is fine for pulling any A/S. The 4.10 rear works best with the 5.3 ltr or 6.0 ltr. With 14600 miles, on a 2005 Suburban, it's almost broken in. Looks like a good find. Differential in fuel cost is really one of the smaller costs in owning a T/V. The big cost is depreation. By buying a 2005, with such low mileage you have already saved yourself a big hunk of money. --Frank S
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Old 10-23-2006, 07:36 AM   #10
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Oh heck yes. 25' to 28'? You'll barely know it's back there.

One thing about the 8.1L. Nearly every owner I've spoken with about their 8.1L has indicated that it appears normal for the 8.1L to consume some amount of oil between oil changes. There are folks the believe this is an issue, while others say, it's an 8.1L, it's normal.

Bottom line, you're fine w/3.73s with what you've outlined.
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Old 10-23-2006, 07:50 AM   #11
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you will be pleased with the big block 3.73 combo.

you also will be able to tow a 34!

john
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Old 10-23-2006, 06:11 PM   #12
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It's ours!

Thanks for all the replies! Each made us feel so good about the Suburban with the 3.73 that it is in our drive at this time. It is ours!

My husband drove it the 120 miles home and is quite happy with it. It has a Class III hitch and everything that goes with that. Now, to get what is necessary to hook up to the A/S that we haven't found yet.

Thanks to the people on this forum, we have bought a TV that will last at least as long as we will be needing it.
Pat
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Old 10-23-2006, 06:41 PM   #13
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Quote:
Originally Posted by starflyte1
Now, to get what is necessary to hook up to the A/S that we haven't found yet.
It may have the GM pigtail to attach to your brake controller (usually included with initial purchase). This plugs in under your dash and the bare wires are fairly easy to figure out connection to the brake controller. I'd suggest talking to RJay's if you don't have that item -- good prices, fast service. Really -- this same item should be available locally at RV dealerships. Just don't tell 'em you have an Airstream ....
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Old 10-23-2006, 07:08 PM   #14
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?

Canoe Stream, why not tell them I have (will have) an Airstream?

Pat
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