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 > 2010 Chevy 1500 - 5.3 - 308 rear tow limit

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ReverendCharles

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Posted: 07/07/11 09:40pm Link  |  Print  |  Notify Moderator

Does anyone tow 7000lbs with this setup? Please don't respond if you use a semi to tow a popup. I am looking at a 5800lb dry trailer with a cargo rating of 1200lbs. My truck is rated 7000lb with the HD cooling package. I pull a 3500lb cargo trailer using the tow haul switch and it will run 3-4000 rpm's on hills and headwinds. Will the truck pull the same with the 7000lb's behind it?

EPenney

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Posted: 07/07/11 10:26pm Link  |  Print  |  Notify Moderator

I towed a 6500# TT with a 2004 Chevy 1500, 5.5, 3.73 with no problems. +6% grades would slow me down some, sometimes down to 35-40 mph. Overall, I was satisfied with the truck.


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JIMNLIN

Oklahoma

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Posted: 07/08/11 06:37am Link  |  Print  |  Notify Moderator

First off his '10 1500 chevy truck comes with the 6L80 auto tranny. The only gear ratio available is the 3.08 and 3.42. There is no need for a 3.73 or higher gears with this auto tranny and its gear ratio splits. There is no 3.73 option available.

The 3.08 in 4th is close to a 3.6 rear gear ratio in the older 4L60 auto tranny trucks. Towing in 3rd is simular in RPMs to 3.9/4.0 gears in the old trucks with the 4L60.

As Socal says you definitely will tell a big difference with the 5.3 towing 7000 lb vs the smaller 3500 lb trailer.


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SoCalDesertRider

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Posted: 07/07/11 11:55pm Link  |  Print  |  Notify Moderator

No, the truck will not pull 7000 lbs the same as it pulls 3500 lbs.

5.3 with 3.08 ratio is not a good combination for towing power. That is an economy ratio with a small engine, good for high gas mileage running empty at freeway speeds.

7000 lbs loaded would be a bad match for that engine/axle combination. You will feel that error in the hills for sure.


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Az.

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Posted: 07/07/11 11:58pm Link  |  Print  |  Notify Moderator

ReverendCharles wrote:

Does anyone tow 7000lbs with this setup? Please don't respond if you use a semi to tow a popup. I am looking at a 5800lb dry trailer with a cargo rating of 1200lbs. My truck is rated 7000lb with the HD cooling package. I pull a 3500lb cargo trailer using the tow haul switch and it will run 3-4000 rpm's on hills and headwinds. Will the truck pull the same with the 7000lb's behind it?
3.73 hello


2005 Chev 5.3 Supercharged 395HP 425 T hp. Two wheels on front, 2 on back. one seat, tint windows. front and rear bumpers, headlights, windows. Door on each side. Heater, floor mats, 6 Reese candy bars, junk behind seats, some dirt. Pulls so hard.

wmoses

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Posted: 07/08/11 05:23am Link  |  Print  |  Notify Moderator

ReverendCharles wrote:

Does anyone tow 7000lbs with this setup? Please don't respond if you use a semi to tow a popup. I am looking at a 5800lb dry trailer with a cargo rating of 1200lbs. My truck is rated 7000lb with the HD cooling package. I pull a 3500lb cargo trailer using the tow haul switch and it will run 3-4000 rpm's on hills and headwinds. Will the truck pull the same with the 7000lb's behind it?

My truck is rated the same as yours since it has the same engine and rear axle ratio. It also has the 6-speed transmission which as many discussions on these boards have indicated, makes it more capable than the a similar combo with 4-speeds (the conventional wisdom) would be. People tend to forget about gears and torque amplification.

That said, towing 7000# with this truck would not be the same as towing 5800#, which in turn would not be the same as me towing my 3500# RV. For instance I don't see 3-4000 rpms too often, and certainly not with headwinds. I can cruise on the flat below 20000 rpm while doing 60 mph also.

The truck is rated for 7000# and I would say that would be fine on flattish terrain limited to 60 mph. Introduce some hills and it will work harder to get up and down and the speed will drop off significantly, although I doubt that it will hurt the truck.

For me -- I set my own limit for this truck's RV "capability" to 80% of the 7000# or 5600# fully loaded. That should give me the comfort I am looking for in the hilly terrain at a decent travel speed.


Regards,
Wayne
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skipnchar

Topeka or somewhere else

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Posted: 07/08/11 07:17am Link  |  Print  |  Notify Moderator

Nope it won't tow the same with double the weight hitched to it. It SHOULD tow 100% of its rated capacity but remember, manufacturers don't guarantee you'll enjoy the tow, only that they will honor the warranty up to 100% of the rating they set for it.
Good luck / Skip


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mkirsch

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Posted: 07/08/11 11:26am Link  |  Print  |  Notify Moderator

The 6-speed transmission is the equivalent of two "jumps" in rear end ratio.

That is, the 3.08 with a 6-speed will drive/tow roughly like a 3.42 with a 4-speed. (3.08-->3.23-->3.42)

That said, 7000lbs will be asking a little much of it.

If it's a 2WD truck you can swap the rear end ratio to a 3.42, or even a 3.73 for <$1000. Be aware with the "granny gear" 1st in the new 6-speed autos, it will act like it really has a granny gear with a 3.73 axle ratio.

You can go to a 4.10 ratio too, but all that gives you is the ability to run in 2nd overdrive while towing.


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gmcsmoke

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Posted: 07/08/11 10:10am Link  |  Print  |  Notify Moderator

You'll need a bigger truck. trust me my cab-over CAT barely handles our tear drop trailer.

gmcsmoke

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Posted: 07/08/11 01:06pm Link  |  Print  |  Notify Moderator

mkirsch wrote:

The 6-speed transmission is the equivalent of two "jumps" in rear end ratio.

That is, the 3.08 with a 6-speed will drive/tow roughly like a 3.42 with a 4-speed. (3.08-->3.23-->3.42)



No, it doesn't have the final drive of a 3.42 it has a final drive of a 3.7; 3.69 to be exact. 3.08 x 1.2(4th gear) = 3.69

it will handle 7,000 pounds just fine.

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