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Old 11-11-2011, 09:55 AM   #1
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Silverado 4.8L, 3.23 Gearing

I've got a 2007 Silverado 4.8L with 3.23 gearing with the Tow Mode feature. The maximum towing specification is 4,700 lbs.

My wife and I are seriously looking at purchasing a Jayco 19RD which has a unloaded vehicle weight of 4,100 lbs. My understanding is the unloaded vehicle weight is the weight with standard equipment like AC, fridge, etc. but does not include water, propane, battery, WDH, sway bars, etc.

At this point we would be taking maybe six trips a year with the longest being a trip from NY to FL. We'd make the trips dry with no water in the tanks and the same sort of "stuff" we'd take if we were flying somewhere. For me that means 30 lbs and my wife 150 lbs . I'm think worse case is we would be right near the max of 4,600 lbs ~ 4,700 lbs.

Not to intentionally press the issue but I know that there is some safety margin factored in when the engineers design and create the published specifications.

My question is does anyone have an real world experience with towing under similar conditions described above?

I don't expect the TV to tow like a 5.8L or diesel but I do want to avoid getting bogged down only doing 40 mph on highway hllls. I'd rather not change the gearing since the vast majority of the driving (95%) I won't be towing anything.

I've read in other place "you'll hate the driving" to "it will handle this with no problems".

What say you?
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Old 11-11-2011, 10:53 AM   #2
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This is just our experience; I'm no expert

Our tv (see signi) is rated to tow over 10k lbs. Our tt runs about 6900lbs loaded for a cross country trip. We drive 60-65 on flat highways. Hills slow us down to about 55-60. Grades reallllly slow us down to about 40-45 even with 'tow haul' mode on.

On the flats and hilly roads, our brakes work well. On the grades, we have to use the 'tow haul' mode so the engine helps slow us down otherwise we would be riding the brakes all the way down (the trailer really pushes our tv down).

You can see that even with an easy 3k pounds to spare, we still have concerns to be aware of. Our experience, we wouldn't tow at the max for our tv. Hope this helps some
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Old 11-11-2011, 10:56 AM   #3
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You of course have to factor in clothes food toys etc that you put in the RV. PLUS the weight of all passengers and anything else you have in the truck...
the industry standard is for a 150 lb driver if you weigh more than that also figure in the difference in your weight.
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Old 11-11-2011, 11:08 AM   #4
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Are you sure your truck is only rated 4700lbs? I can`t find anything that low for a 4.8 on this tow ratings site. Is it a manual transmission? That would lower it somewhat. This site is for the "classic" older style 2007 Silverado. http://www.cascaderv.com/Towing/07towratings.pdf

OK on edit I see that the NEW style 2007`s have much lower tow ratings then the "classic" 2007`s. I believe production changed mid model year to the new body style. So I`m guessing yours is the new body style with the lower ratings.
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Old 11-11-2011, 01:34 PM   #5
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Quote:
Originally Posted by Crabman View Post
Are you sure your truck is only rated 4700lbs? I can`t find anything that low for a 4.8 on this tow ratings site. Is it a manual transmission? That would lower it somewhat. This site is for the "classic" older style 2007 Silverado. http://www.cascaderv.com/Towing/07towratings.pdf

OK on edit I see that the NEW style 2007`s have much lower tow ratings then the "classic" 2007`s. I believe production changed mid model year to the new body style. So I`m guessing yours is the new body style with the lower ratings.
Yep, the 4,700 lbs maximum trailer weight is right out of the owners manual for a 2007 Silverado, extended cab, 4.8L 3.23 axle ratio.

The GCVW for the Silverado as configured (engine and axle ratio) is 10,000 lbs. If you add the empty weigh of the TV (4,700 lbs) and start adding passengers, fuel and minimal cargo it looks like pulling even an empty 4,700 lb trailer would get me over the limit.

If I want to stick with my current TV I could switch to a 3.73 axle ratio which ups the maximum trailer weight to 6,700 lbs and GCVW to 12,000 lbs. Other then switch TV's altogether that may be the only option if we want to go with the 19RD.
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Old 11-11-2011, 02:19 PM   #6
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It's your engine, tranny, and final drive ratio that is killing your towing capacity, not the truck chassis. It's not that it would be unsafe per se, it would just be very detrimental to your truck's performance and longevity.
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Old 11-11-2011, 03:47 PM   #7
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Originally Posted by 3Pillons View Post
It's your engine, tranny, and final drive ratio that is killing your towing capacity, not the truck chassis. It's not that it would be unsafe per se, it would just be very detrimental to your truck's performance and longevity.
Understood.

I'm pretty sure the engineers at GM set the towing limits based on being able to safely go to those limits with reasonable performance (maintaining highway speeds while towing would seem reasonable to me), and doing so with a high level of confidence that under these conditions the vehicle won't fall apart, at least while it is still under warranty .

I think my plan of action will be switching to the 3.73 axle ratio, which boast the tow limits to 6,700 lbs max. trailer weight and 12,000 lbs max. combined vehicle weight, and then rent a trailer of similar size/weight to see how the truck performs.
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Old 11-11-2011, 06:48 PM   #8
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I would just add a large transmission cooler, keep it OUT of over drive, and tow with it. It all depends on how long you plan on keeping the truck and how much you want to spend on a 5 year old truck. Just putting a smaller size set of tires on will effectively lower your final gearing.

Just my opinion.
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Old 11-12-2011, 02:50 PM   #9
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Be sure that your tires are rated for the heavier load that you will be hauling and yes you wi9ll be doing 40 mph on small grades. Larry ps don't forget, it is the wind resistance and not always the weight that slows you down.
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Old 11-13-2011, 09:01 AM   #10
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Originally Posted by 19H F250 View Post
Be sure that your tires are rated for the heavier load that you will be hauling and yes you wi9ll be doing 40 mph on small grades. Larry ps don't forget, it is the wind resistance and not always the weight that slows you down.
Make sure you dont have P rated tires they are not made for any trailer towing.
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