The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > Trucks & Trailers
Search

Notices

Random Quote: I dont know nothin about fishin but I can lie as good as any fisherman.
Reply
 
Thread Tools Search this Thread
Old 02-08-2012, 10:26 PM
  #1    
Senior Member
 
Join Date: Feb 2009
Location: 26 46.596' -80 2.732'
Posts: 2,651
Question Lift, bigger tires' effect on tow rating?

Strange question, my truck is rated to pull 4.9k pounds. Does my capacity decrease with a lift and off road tires? If so, about how much?

I have a 3" lift/leveling kit and went from the factory 31" tire to 34.5" Nitto TrailGrapplers.

We're looking to buy a Contender 21/23 or Bluewater 2150 before summer and I don't necessarily want to trade in my little Tundra unless I absolutely have to.

Truck in question, because every one loves pics
__________________
aiian is offline   Reply With Quote
Old 02-09-2012, 12:13 AM
  #2    
Senior Member
 
Join Date: Dec 2007
Location: Gulfport MS
Posts: 157
Default

Yes and no, It wont have as much power as it would stock, but should be able to pull that.

One reason if you look at stock GM products, they have small tires, thats to increase there payload, where fords stock tire is way taller
__________________


Please keep your pictures within the 500x200 DPI requirements.
2StrokenMako261 is offline   Reply With Quote
 
Old 02-09-2012, 04:15 AM
  #3    
Senior MemberCaptains Club Member
 
Join Date: Feb 2007
Location: MA
Posts: 4,561
Default

Definetly decreases the tow capacity, tough to say by what amount.
Is your truck 2wd with the 4L 6 cyl?
__________________
'05 Pacific 1925
MacCTD is offline   Reply With Quote
Old 02-09-2012, 04:26 AM
  #4    
Senior Member
 
Join Date: Dec 2007
Location:
Posts: 456
Default

Lets assume your truck is a 2007 with over 60k miles. Since your tow rating is a warranty issue, the larger tires will have no impact on your expired warranty when towing.

Obviously a higher center of gravity, less braking power, and (unless you regeared) a higher transmission ratio don't improve towing ability.
KarlP is offline   Reply With Quote
Old 02-09-2012, 05:18 AM
  #5    
Admirals Club
 
Join Date: Sep 2004
Location: Mechanicsville VA
Posts: 6,124
Default

It's not likely to mean much in "tow rating" but you will notice a difference from stock. Braking distance will increase and acceleration will drop due the the extra weight of larger tires. 100lbs in the bed of the truck doesn't make much difference, but 100 lbs of extra tires really does. Since you've already modified the truck and I assume you have a boat, you should have noticed this difference already.

FYI: I did almost your exact mods to a Ford dually. 6.0L 4:10 gears and went from 31.5 to 34.5 tires.......towing a 21 ft CC is obviously not an issue but I did notice the difference after the bigger tires went on. My effective gear ratio dropped and pulling power was lost, braking distance increased as well.
__________________
"The problem with quotes on the internet is that you can never be certain they are accurate"----Abraham Lincoln

Last edited by t500hps; 02-09-2012 at 08:21 AM.
t500hps is offline   Reply With Quote
Old 02-09-2012, 07:49 AM
  #6    
Senior Member
 
Join Date: Mar 2011
Location: Algonac michigan
Posts: 3,357
Default

Kills the gearing,makes your truck brakes less effective and screws up the hitch height of the truck.The lift also changes the leverage of the trailer on the truck by altering the angles of various hitch related hardware.
muskamoot is offline   Reply With Quote
Old 02-09-2012, 08:25 AM
  #7    
Senior Member
 
Join Date: Oct 2010
Location: Pensacola
Posts: 2,071
Default

Quote:
Originally Posted by t500hps View Post
It's not likely to mean much in "tow rating" but you will notice a difference from stock. Braking distance will increase and acceleration will drop due the the extra weight of larger tires. 100lbs in the bed of the truck doesn't make much difference, but 100 lbs of extra tires really does. Since you've already modified the truck and I assume you have a boat, you should have noticed this difference already.

FYI: I did almost your exact mods to a Ford dually. 6.0L 4:10 gears and went from 31.5 to 34.5 tires.......towing a 21 ft CC is obviously not an issue but I did notice the difference after the bigger tires went on. My effective gear ratio dropped and pulling power was lost, braking distance increased as well.
The increased tire weight increases the flywheel effect.
But it also increases the lever length between the axle and the road of which the brakes have to overcome in order to do a proper job.
That longer lever also makes everything else in the drivetrain work harder.
That lever is 11.3% longer so maybe there is an 11.3% reduction in tow capacity.
DoubleO7 is offline   Reply With Quote
Old 02-09-2012, 08:58 AM
  #8    
Senior MemberCaptains Club Member
 
Join Date: Dec 2004
Location: ATL/SAV
Posts: 660
Default

My GMC doesnt seem to notice.

[IMG] Uploaded with us[/IMG]

[IMG] Uploaded with us[/IMG]
__________________


Fountain 32CC
maxzilla is offline   Reply With Quote
Old 02-09-2012, 10:17 AM
  #9    
Senior Member
 
Join Date: Feb 2009
Location: 26 46.596' -80 2.732'
Posts: 2,651
Default

Yes, it's the 4L V6, RWD.

I figured the capacity would decrease with the modifications but does anyone know by about how much?

I've pulled an 18' SeaPro CC up and down 95 a few times and I didn't exactly feel like the truck was inadequate. She pulled and stopped just fine. I don't know how much the SeaPro weighed but I can't imagine the Contender or Bluewater could bet that much heavier.
__________________
aiian is offline   Reply With Quote
Old 02-09-2012, 10:28 AM
  #10    
Admirals Club
 
Join Date: Sep 2010
Posts: 1,012
Default

8" lift and 40" tires and I have no complaints towing my boat, camper, or car trailer
__________________

Excursion 7.3
Hydra-Sports 23 Bay Bolt
jwfost is offline   Reply With Quote
Old 02-09-2012, 10:41 AM
  #11    
Admirals Club
 
Join Date: Sep 2009
Location: Dania Beach, FL
Posts: 2,097
Default

For short trailer rides you should be ok, but you will be working that truck hard at or above its max capacities. Highway speeds will drastically reduce the tranny life.

I would also try and get someone to chime in a a real world weight on a 2150 bluewater with full fuel, gas, ice and dual axle trailer. I think you will be above the 5000lb mark.
__________________
It's NOT the boat that catches the fish !!!!


My Ride ---------------------------------------------------My part time job
Dream Catcher ------------------------------------------Custom 74' Buddy Davis

DreamCatcher14 is offline   Reply With Quote
Old 02-09-2012, 10:50 AM
  #12    
Senior MemberCaptains Club Member
 
Join Date: Jun 2006
Location: The South
Posts: 1,975
Default

I'm not sure what the lift or tires do to the towing capacity, but I think that truck would struggle to tow a 21BW/21Contender to begin with.
__________________
Contractor is offline   Reply With Quote
Old 02-09-2012, 11:34 AM
  #13    
Senior Member
 
Join Date: Feb 2008
Location: Jupiter, Florida
Posts: 1,098
Default

You didn't go that big but as you sit now with basically just bigger tires and no other significant mods yes you probably lost some capability. You also are stressing your tranny more and the heavier tire is working the stock brakes more. Re-gearing a 4x2 is relatively cheap and can take care of the loss of power up to a point and take the strain off the tranny (use a calculator to figure your stock overall ratio and then what gear is needed to get that back considering the new tire and then go at least one higher numerically), plenty of aftermarket brakes (powerslots/toyota upgrades/wilwood/brembo/etc.) to get that back and then some and with a drop/adjustable ball mount should have no issues getting whatever ball height you want. Aftermarket sway bars, shocks, springs, bags/etc. all avaliable to stabilize and in some cases improve ride over stock when loaded. It's all about what you build your truck to do and doing all the supporting mods to do it right. You didn't go so big in the tire that you can't do some supporting mods to get back whatever capabilities may have been reduced. In the end you can never really get back loss of mpg and the money it all costs to do it.

Gear - $500-600/axle
Brakes - $1,000 for small upgrade and about $4,000 for full 6 piston/slotted system
Suspension mods - couple hundred to several grand

IMO for your truck and what you've done I'd change the gear and put on a set of powerslot rotors and good pads minimum. Also, may want to upgrade the stock shocks to something like Bilstien and consider a set of bags in the rear. Probably $2k total.
blackdawg is offline   Reply With Quote
Old 02-09-2012, 12:12 PM
  #14    
Senior Member
 
Join Date: Sep 2005
Location:
Posts: 1,562
Default

I would calculate your gearing reduction from stock: Same % decrease in gear ratio as is the increase in % of tire diameter. I would then base the tow rating based on he stock truck with your new "effective" gear ratio. There is a catch though, you have diminished brake leverage by the same amount that the stock equivalently geared truck will not see.

Then there are the subleties:
.Did the lift kit come with a new driveshaft and provision to maintain the stock pinion angle(s)?
.Worse aero drag
.Higher center of gravity. Less stable unless widen track which requires a whole bunch more suspension parts. Wheel spacers just task the bearings more.
.More rolling resistance (effective drag) with larger tires. Increase % throttle required at all speeds.
Unless a thoroughly designed complete system (ala Ford Raptor), you likely are sacrificing a lot for "the look". Jeez, remember the days of the early 90's when it was the little 12" wheels spaced out from the body that was "cool".
To the OP: very tasteful, love the monochromatic look.

Last edited by crothers; 02-09-2012 at 12:41 PM.
crothers is online now   Reply With Quote
Old 02-09-2012, 12:29 PM
  #15    
Admirals Club
 
Join Date: Jul 2009
Location: PORT ST LUCIE, FL
Posts: 3,238
Default

Quote:
Originally Posted by Contractor View Post
I'm not sure what the lift or tires do to the towing capacity, but I think that truck would struggle to tow a 21BW/21Contender to begin with.
I towed my 2150 with a 2005 Tacoma that has the same drivetrain. It pulled it great. I now have a 2011 F150 with the 5.0L and don't notice a big dirrerence between the two.
__________________
2014 Bluewater 2150
JOEKEN is offline   Reply With Quote
Old 02-10-2012, 06:20 AM
  #16    
Senior Member
 
Join Date: Mar 2011
Location: Algonac michigan
Posts: 3,357
Default

Whatever you do,make sure you readjust the trailer hitch height to level out the trailer.
muskamoot is offline   Reply With Quote
Old 02-10-2012, 06:48 AM
  #17    
Admirals Club
 
Join Date: May 2010
Location: North Palm Beach, FL
Posts: 1,315
Default

You will be fine...I tow my 23 contender with a 3" lifted and modded Tacoma with no problems. Of course, towing awareness and proper braking strategies are required as you will be harder to slow down.

Your truck is beefier than mine so I wouldnt hesitate!

__________________

SOLD 1995 Contender 23 Open
Verado 275
GatorContender is offline   Reply With Quote
Old 02-10-2012, 09:44 AM
  #18    
Senior Member
 
Join Date: Apr 2010
Location: North Texas
Posts: 251
Default

Quote:
Originally Posted by JOEKEN View Post
I towed my 2150 with a 2005 Tacoma that has the same drivetrain. It pulled it great. I now have a 2011 F150 with the 5.0L and don't notice a big dirrerence between the two.
That is an interesting comment. You would think 120+ extra hp and 100+ ft/tq would make a pretty obvious difference.
__________________
2009 Kencraft Seaking 210 w/ F150
Jonboater is offline   Reply With Quote
Old 02-12-2012, 02:32 PM
  #19    
Senior MemberCaptains Club Member
 
Join Date: Mar 2006
Location: Tampa
Posts: 1,086
Default

Quote:
Originally Posted by Jonboater View Post
That is an interesting comment. You would think 120+ extra hp and 100+ ft/tq would make a pretty obvious difference.
The ford probably weighs a lot more than the Taco thats why it probably doesn't seem significant.
Patton222 is offline   Reply With Quote
Old 02-21-2012, 09:29 AM
  #20    
Junior Member
 
Join Date: Feb 2012
Location: Jacksonville, Fl
Posts: 5
Default

For every inch in tire diameter you will lose approx. 500lbs in towing. It is always something that has stuck in my mind when I am looking at new tires or rims. Here is a link http://www.traveledlanetrailers.com/...railering5.htm . It should also say something in your owners manual.

Last edited by knotdusty; 02-21-2012 at 09:43 AM.
knotdusty is offline   Reply With Quote
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0