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Old 11-27-2004, 06:35 PM   #15
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Originally Posted by happy82301
Hi Nick, I understand that. So what Jim is really saying is that he is underpowered not overloaded. Marvin
Marvin, no, not necessarily underpowered. It's a matter of gearing. A race car might develop twice the horsepower of my diesel truck, but it couldn't pull my Airstream over the Rockies. It develops the high horsepower at high revs, and because of its gearing, that is at high speed. Remember the two identical trucks going up the hill? They both develop the same horsepower, but the 3.55 fails first because of its higher first gear. The 4.10 can produce more ultimate "leverage" or torque, on the driving wheels, in first gear, in the efficient rev range of the engine. Think of two cyclists climbing side by side up a very steep hill, which gets steeper and steeper. Both riders are identically powerful, and both bicycles are identical, apart from one having a lower first gear ratio. You know that the other guy will stop first, and it's the same with trucks. Nick
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Old 11-27-2004, 07:12 PM   #16
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Itís interesting that the Gross Vehicle Tow Rating Changes that much with less than one rev of the drive shaft to rear end gear ratio. Technically if my rig were weight by the Highway Patrol and I was over 16,000 pounds I would be in violation of the law. If I changed the differential to a 4.10 ratio I might be within the law being able to tow 20,000 pounds but because of the tow vehicle vin number which would identify me as having a 3.55 I still would be in violation by exceeding the 16,000 pound limit, if they wanted to get really picky.
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Old 11-28-2004, 12:43 AM   #17
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It calculates that I might be at or about 100 pounds over gross with the 3.55 rear end. 16,000 pounds. With the same tow vehicle with a 4.10 rear end I could tow an additional 3000 plus pounds. 20,000 pounds. So am I really in a towing danger zone or am I just wearing the drive train / transmission out faster.
For all you "ArmStream Quarterbacks" waiting for spring to return, I thought you might enjoy crunching some numbers on your rigs while waiting for the travel season to return! Seriously.....I started this thread to give folks who have never towed before (like me before purchase) a simple reference to input information on different tow vehicles and trailers, so they could see "on paper" they were in the "safety range". The forums provide great help, but there are some diversities in opinions. This spreadsheet was the first "hard" evidence I could "hang my hat on" that I was in the "ballpark" when choosing my tow vechicle. The car dealers are not informed in these matters, and the AS dealers "may" tell you anything to sell you the "trailer of your dreams"!
"TinselLoaf", which spreadsheet did you use? I tried to post the "popupexplorer.com" spreadsheet. Did you use that one? I found the "weight calculator" from HAPPY to be confusing, and didn't understand all the information needed to input (I haven't been able to weigh my AS yet). I didn't see any input in either spreadsheet for different rear end axle ratios (did I miss something?) entered into the spreadsheets!
Where did you get the extra 4K lbs on the 4.10? The calculation of 16,000 is your Total Rig Weight (Actual wight tow vehicle + Actual weight Travel Trailer)?

Jim
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Old 11-28-2004, 09:36 AM   #18
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Jim, Sorry if I made this more confusing, Just thought this would another option of calculation weight. Just noticed your tow vehicle. Very nice, I would think you could tow any trailer Airstream makes except for maybe a 34ft with a slide out. Marvin
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Old 11-28-2004, 10:24 AM   #19
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Jim, Sorry if I made this more confusing, Just thought this would another option of calculation weight. Just noticed your tow vehicle. Very nice, I would think you could tow any trailer Airstream makes except for maybe a 34ft with a slide out. Marvin
Marvin,

I think both spreadsheets are helpful....if you have all the information to input into them. I haven't weighed mine yet at a scale, so I couldn't complete yours. When I purchased my 22' AS, I had a Ford Ranger V6 4x4 with 4.10 rear end. I towed it one time with this on flat land, and quickly realized that if I wanted to do any serious hills, I'd better seek more power! That's where the spreadsheet helped. I chose to buy 3/4 ton because I was in the safety range (85% of GCWR) with water tank full. Also, I thought that "if" I wanted to, I could trade for larger AS, if the 22' didn't work out! One point stressed in discussions on these forums that the spreadsheet does'nt address specifically is that "braking ability" was extremely important, and bigger is better!

Jim
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Old 11-28-2004, 07:56 PM   #20
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Smile towing capacity worksheet

Thanks very much for posting the towing capacity worksheet. I had printed out a long explanation of how to do it from some website and had done it manually, but this was easier. FWIW, it confirmed that my manual calculations were pretty much on the money.

I'm debating between an F-250 PSD crew cab and the Silverado 2500HD crewcab w/ Duramax & allison tranny as the tow vehicle for an '05 CCD 28 ft. Using the Ford data, I'll be about 68% of GCVWR, and with the Chevy, about 65%.

I've learned so much by reading threads on these forums. Thanks again for the worksheet.
Claudette
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Old 11-29-2004, 06:39 PM   #21
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Jim

Yes I used the worksheet you provided and yes our rig is over gross towing capacity according to the manufacturer specifications for towing. I am taking into account the gross vehicle tow rating. It is not the Airstream that is over gross, it is the tow vehicle. The tow vehicle with the 3.55 differential is the limiting factor at 16,000 pounds. If I had purchased the 4.10 rear end I would be well within the specifications 20,000 pounds for towing the heavy Airstream.
The worksheet is fine to figure out your weight and it is because of it that I found that my tow vehicle has the wrong differential. I should point out that I have not had any trouble towing our Airstream but am now aware that I am putting a strain on the drive train which may shorten itís life. When I ordered our van I mentioned to the dealer very clearly the weight I was planning to tow. The dealer could care less what I was towing he just wanted to make a sale. Same with the Airstream dealer. I could have pulled up in a Pinto ant they would have attached a hitch to it and waved good by as I pulled the 31 foot AS from the lot as they shoved my money into their pockets. If that is the only error I made in my purchasing calculations than I didnít do to bad. So folks, a big rear end, ďItís a good thingĒ. Thanks again for the worksheet, it has been very helpful.
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