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Old 11-26-2004, 06:23 PM   #1
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Towing Capacity Worksheet

Before deciding to go with an AS, another trailer mfg'er shared with me a spreadsheet that could be used to calculate whether my tow vehicle would work with the trailer. I used it to compare several tow vehicles in combination with different sized trailers. I found it quite helpful in my initial search for the ideal tow vehicle to use with the trailer I wanted. Try it out and give me some feedback after you've used it!

I've posted it on the web but the link wouldn't work! Nick Crowhurst found it elsewhere and posted the link below in his post!

Jim
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Old 11-26-2004, 06:28 PM   #2
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Your link does not appear to work.
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Old 11-26-2004, 06:34 PM   #3
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Is it this one? http://www.popupexplorer.com/files/T...yWorksheet.xls
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Old 11-26-2004, 06:37 PM   #4
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Quote:
Originally Posted by richardt
Your link does not appear to work.


Hmmm....it works on my computer......I've been trying to devise a way to get this on the forums...and since it's a spreadsheet...and since we cannot attach .xls format files to posts, I created a users site on msn to place the file. Maybe I'm the only one who can access the file!! I'm sorry, I thought this would work...any one have any suggestions?? I would prefer not to email this file to each person who wanted to use it...but have it accessible to all easily on the web. Now, maybe you all could help me out to solve this because I think it would be helpful to a lot of folks here on the forums.

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Old 11-26-2004, 06:44 PM   #5
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Quote:
Originally Posted by nickcrowhurst
That's it!! I could not find it after I downloaded it from the computer some time ago. Great! Well anyway it's accessible now thanks to you! Has this been on the forums before?? I sure haven't seen it. Evidently some of you have used it before...but I didn't think it was common knowledge on the forums! I guess I better edit my initial post to erase my errant hyperlink!!

Thanks!

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Old 11-26-2004, 07:52 PM   #6
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Thank's, Looks good. Now I just need to find my weight numbers and plug them in.
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Old 11-26-2004, 09:16 PM   #7
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spread sheet

This is another one that works real well.

Weight Calculator
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Old 11-26-2004, 10:31 PM   #8
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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.
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Old 11-27-2004, 07:05 AM   #9
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Thanks... great worksheet. Combined with the Interstate Scales actual weights data I obtained this is a useful bit of information.

Combine that with tire capacity tables from Goodyear and you can calculate the needed tire PSI's for both the trailer and tow vehicle.

I am able to run under the "suggested" inflation numbers I have frequently seen posted thereby softening the ride for the trailer contents. BTW - I DO check the tires for temperature EVERY time I stop during trips. Never had a tire I could not lay my hand on due to temperature.

Thanks again,

Dave
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Old 11-27-2004, 08:11 AM   #10
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Originally Posted by Tinsel Loaf
So am I really in a towing danger zone or am I just wearing the drive train / transmission out faster.
Tinsel Loaf, changing your differential from 3.55 to 4.10 would not affect the safety of your rig, IMHO. Your transmission will just change gears at lower road speeds. With the 3.55, you need to be more careful not to "lug" the engine and transmission. That is, you need to be wary about using overdrive, if fitted, and you may occasionally need to use manual overide to select a lower gear to protect the systems. A higher gearing means lower RPM at a given road speed, which means lower fluid pressure in an automatic transmission, which means lower clamping forces on the internal clutches, which leads to slippage, which leads to heat, which destroys the fluid, and then the transmission. To deal with this, I use a BD pressure-loc, which raises tranny fluid pressure at low RPMs, and I keep a close eye on the tranny fluid temperature gauge. Nick
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Old 11-27-2004, 11:25 AM   #11
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Thank Nick
I do take it out of overdirve when I'm not on level ground. The BD pressure loc looks like a good addition to keep the transmission running longer.
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Old 11-27-2004, 04:25 PM   #12
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3.55 4.10

This is where I get really confused. How can you be overloaded at 16,000 pounds with a 3.55 and go to a 4.10 gear and be able to go up to 20,000 pounds. I understand the gears but the amount of weight that axles can carry hasn't changed nor has your stopping ability, the brakes are not bigger. Can anyone help me understand this. Thanks Marvin
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Old 11-27-2004, 04:42 PM   #13
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This is where I get really confused. How can you be overloaded at 16,000 pounds with a 3.55 and go to a 4.10 gear and be able to go up to 20,000 pounds. I understand the gears but the amount of weight that axles can carry hasn't changed nor has your stopping ability, the brakes are not bigger. Can anyone help me understand this. Thanks Marvin
Marvin, imagine two trucks which are identical, apart from one having a 3.55 axle, and the other a 4.10. Take them to a very steep incline, and drive them up empty. Now repeat the process, adding one thousand pounds to each truck. Keep repeating the process, adding 1000 pounds each time. Eventually, the 3.55 axle truck will be unable to climb the hill in first gear, but the 4.10 axle truck will keep going, because it is in a lower gear. Carrying capacity will depend on braking, suspension, frame strength and steering, but designers have to ensure that their vehicles will be able to handle the steepest grades they are likely to meet, even when fully loaded. Thus the 4.10 will rate a higher capacity, even though the axles and brakes are identical. I hope this helps. Nick.
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Old 11-27-2004, 05:30 PM   #14
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Hi Nick, I understand that. So what Jim is really saying is that he is underpowered not overloaded. Marvin
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