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Old 09-29-2012, 08:52 AM
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towing weight with mods

Instead of spending all day searching old threads, here goes...

How heavy of a 5th wheel can I tow with my truck? I have 37" Toyo MT's and 3.73 rear-end. I am running a Spartan set on 300 (which I'll go to the 210 TP) and an S&B intake. No other mods to engine or transmission.

We are looking in the 11K-12k range for dry weight.

(I towed a larger skidsteer for a guy not to long ago with the regular hitch, and although the loader was loaded to the front real bad and had my truck sitting on the axle, it didn't enjoy pulling that load. Owner guess-timated it to be 12K lbs, so im worried about a 5th wheel at a similar weight)
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Old 09-29-2012, 09:35 AM
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I know the 6.4's have a better power delivery and more power than my 6.0, but 37's with 3.73 gears is gonna be a chore tugging a 12k dry 5th wheel, not only is it the same weight as your load you said the truck didnt like, you have that much more air to move out of the way also.

I'd say regear or run smaller tires for towing.

Jason
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Old 09-29-2012, 10:28 AM
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Old 09-29-2012, 10:47 AM
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Quote:
Originally Posted by sjl2725 View Post
Instead of spending all day searching old threads, here goes...

How heavy of a 5th wheel can I tow with my truck? I have 37" Toyo MT's and 3.73 rear-end. I am running a Spartan set on 300 (which I'll go to the 210 TP) and an S&B intake. No other mods to engine or transmission.

We are looking in the 11K-12k range for dry weight.

(I towed a larger skidsteer for a guy not to long ago with the regular hitch, and although the loader was loaded to the front real bad and had my truck sitting on the axle, it didn't enjoy pulling that load. Owner guess-timated it to be 12K lbs, so im worried about a 5th wheel at a similar weight)
Let me start by saying I'm not trying to be turd when I say the following.
Please don't do what a lot of people do by looking at the dry weight of the trailer. The truth is you won't be towing dry except for when you pick it up. After that, you'll have stuff on board, (Food, clothes, dishes, Propane and other stuff you acculalate for using the trailer) Look at the GVW for the trailer. You may tow that heavy, but it should the weight to consider.
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Old 10-01-2012, 10:12 AM
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Quote:
Originally Posted by sjl2725 View Post
Instead of spending all day searching old threads, here goes...

How heavy of a 5th wheel can I tow with my truck? I have 37" Toyo MT's and 3.73 rear-end. I am running a Spartan set on 300 (which I'll go to the 210 TP) and an S&B intake. No other mods to engine or transmission.

We are looking in the 11K-12k range for dry weight.

(I towed a larger skidsteer for a guy not to long ago with the regular hitch, and although the loader was loaded to the front real bad and had my truck sitting on the axle, it didn't enjoy pulling that load. Owner guess-timated it to be 12K lbs, so im worried about a 5th wheel at a similar weight)


I would look to a smaller set of tires or high gears. The final gearing is going to drop a bunch and be real hard on the truck and components.

I would drop to the Lowest setting /stock power to tow for longevity and to keep EGT's within reasonable limits.

My 450 puts almost 500hp to the ground I towed a small enclosed trailer 8K# about 4200 miles this summer. My only concern was EGT and climbing some the hills out west the truck got real hot real quick. I have 4.30 with 265.70X19.5 34.5 tall. The math works out to 3.98:1 final gearing that is just 2.5 inches over stock, your 5 inches over stock. and starting with higher gears.
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Old 10-01-2012, 10:18 AM
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37in tall 3.73:1

Overall effective gearing 3.2:1

based on stock tire size of 32 inch
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Old 10-01-2012, 11:40 AM
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I have a 40ft toyhauler loaded down at 16k, my truck has 35" toyos and 4.3 ring gear. I tow with the spartan 210 monthly and love it, no issues.
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Old 10-01-2012, 12:36 PM
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I would run a VERY low tune. I think towing heavy on a big tune is just asking for trouble.
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Old 10-01-2012, 03:10 PM
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How much ballpark to put in lower gears? Guess I'd have to do the front and back, eh?

I am a turf equipment mechanic, and have done some gear boxes, pto's etc. I think I MIGHT be able to handle the labor. Shouldn't be incredibly difficult. Hate to sound like a 40 year old kid, but I like the way my truck looks. And my MT's are new. over 2K in them... ya know? Maybe she'll like a lighter camper! We are going to Tulsa this weekend.... The 11K lb Avalanche, might be a bit much...

thanks for all your replied... keep em coming... Still deciding on what to do.
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Old 10-01-2012, 03:38 PM
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I had mine done at 4wheel parts warehouse in slc both axles 1800$
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