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Old 08-07-2013, 09:52 PM
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2006 WK Towing Upgrades

All,

I have a 2006 GCWR with the 3.7L V6. It has 141k on it and runs great. Obviously we all know these things are tanks and the V6 is not a barn burner. My wife and I recently have downsized and gotten rid of our toy hauler and our 1ton dually diesel. This means our jeep is now our vehicle to tow with. I know the tow rating is 3500 lbs, so my questions are as follows:

How well do these tow at the 3500 lb rating? Is there any margin built in?
I am looking at buying a small camping trailer that GVWR at 3500 lbs. I am considering the following upgrades:

3.73 Gearing change
B&M Super Cooler External Trans Cooler with 10" Fan
Transmission Temp Gauge
Hypertech Max Energy Programmer
K&N Air Intake System
Bilstein Shocks
Air Raid Air Bags
Tekonsha Trailer Brake Controller

Does this seem like a good idea or waste for towing 3500 lbs? I will say I am not interested in spending the money to buy a unit with the 4.7l as we just looked into it and this one is almost paid off. Any feedback on your towing experience with the 3.7L would be appreciated.

Cory
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Old 08-08-2013, 12:14 PM
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Re: 2006 WK Towing Upgrades

Moderator,

I just realized this was posted in the Commander Forum! Can you please move to the appropriate forum?

Thanks and sorry for the trouble!

Cory
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Old 08-08-2013, 12:20 PM
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Re: 2006 WK Towing Upgrades

your list looks fine, except for the gearing change. I would not do that for 3500lbs, besides the cost switching the gears will equal everything else on the list, not worth it in my opinion.

You could also skip the Bilsteins if you have air bags because the air bags pretty much eliminate anything the shocks do.
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Old 08-08-2013, 03:53 PM
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Re: 2006 WK Towing Upgrades

As far as the gearing, it isn't that bad. I can get complete front carrier and rear axle out of salvage yards around here for $700 in 3.73 non-ELSD. Clean them up, go through them, new fluids, etc... and install.

As far as the shocks are concerned, proper chassis control is crucial to safe towing especially during braking. Since adding airbags will greatly affect the spring rates at the rear corners, there should be additional proper valving for the dampening. 141K original shocks are most likely not going to handle the additional spring rate....

The last thing is, the research I have done, it looks like the tow packlage equipped Liberty's with the 3.7L have a viscous driven mechanical cooling fan inconjunction with the electric fan. Is this true? Has anyone located this part number and added it to the WK?

Cory
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Old 08-09-2013, 11:22 AM
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Re: 2006 WK Towing Upgrades

Quote:
Originally Posted by CumminsTrader View Post
As far as the gearing, it isn't that bad. I can get complete front carrier and rear axle out of salvage yards around here for $700 in 3.73 non-ELSD. Clean them up, go through them, new fluids, etc... and install.

As far as the shocks are concerned, proper chassis control is crucial to safe towing especially during braking. Since adding airbags will greatly affect the spring rates at the rear corners, there should be additional proper valving for the dampening. Cory
parts are not so much the issue, my understanding is that you have to get the TCM or ECU or both reprogrammed before you drive it or risk damaging the transmission.

air bags are so multiadjustabe that I'm not understanding your thinking that Bilstein will do something more than a stock shock, so I'd like to understand that more because perhaps I should Bilstein on my WK because I do tow quite often in the summer. I just installed bwoody links on the front and will install bwoody in the back shortly. I have not noticed any difference with respect to bwoody links on the front.
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Old 08-09-2013, 06:56 PM
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Re: 2006 WK Towing Upgrades

I don't know if I quite buy that damage will result unless reprogrammed.... It is the final drive and would be the same (probably not to this extent, but you would have to calculate the difference) as running much smaller rubber and/or rim combination. Yes the speedo and odometer would read off and it may or may not shift quite the same, but damage would be unlikely.

With that being said, one of my reasons for the Hypertech is allows for calibration correction for gear changes and tire changes. This should remedy any issues with the change in overall ratio.

As far as the suspension goes, yes you are correct that the air spring is variable spring rate. However, either way you look at it, the overall spring rate for each rear spring "assembly" will be a higher spring rate. Now dampers have compression and rebound valving that is tuned to specifically remove the unwanted motion of the suspension it is apart of. Jeep engineered that valving to be a compromise of ride quality, cornering/brake diving, and travel. One of the key inputs into the valving is spring rate.

Now, you take and increase the spring rate even at the lowest air pressure setting, and the dampers have a much harder time coping with the unwanted movement. Add tongue weight that is applying leverage to the rear axle and causes the motion to start vehicle rocking. This can cause varying tire contact pressure and consequently traction. Now if you were to apply the brake strongly like in a panic stop, you can cause serious brake dive and removal of weight off the rear tires which lifts the tongue of the trailer and induces trailer sway. Bad situation altogether....

So now you add 7 years and 141,000 miles in my case and the wear that has taken place in the shock has reduced it valving ability by causing fluid bleed by in the piston seal assembly. In essence it is a much softer damper. Combine that will increased spring rate, and the above just got worse.

I am a huge fan of Bilsteins. They are high quality with more aggressive valving. They are not harsh, but much firmer than a Monroe, or generic KYB. That additional valving will help control the increase in spring rate. Is it perfect, no because like you stated, the spring rate is not linear. It is however much better than stock and can only improve the vehicles ability to control the truck/trailer combination.

You won't find a better deal on them BTW then www.eshock.com

(Unless they fall off the back of the Bilstein delivery truck.....)

Cory
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Old 08-09-2013, 07:52 PM
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Re: 2006 WK Towing Upgrades

Duplicate...
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Old 08-09-2013, 10:01 PM
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Re: 2006 WK Towing Upgrades

I wrote a reply, but it says it has to be approved by a moderator.....

Cory
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Old 08-09-2013, 10:03 PM
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Re: 2006 WK Towing Upgrades

Duplicate post again....sorry
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Old 08-09-2013, 10:03 PM
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Re: 2006 WK Towing Upgrades

Duplicate x2
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Old 08-09-2013, 10:04 PM
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Re: 2006 WK Towing Upgrades

Ahh figured it out....evidently you cannot post a good vendor for parts being discussed..?

Cory
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Old 08-19-2013, 01:35 AM
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Re: 2006 WK Towing Upgrades

Quote:
Originally Posted by CumminsTrader View Post
All,

I have a 2006 GCWR with the 3.7L V6. It has 141k on it and runs great. Obviously we all know these things are tanks and the V6 is not a barn burner. My wife and I recently have downsized and gotten rid of our toy hauler and our 1ton dually diesel. This means our jeep is now our vehicle to tow with. I know the tow rating is 3500 lbs, so my questions are as follows:

How well do these tow at the 3500 lb rating? Is there any margin built in?
I am looking at buying a small camping trailer that GVWR at 3500 lbs. I am considering the following upgrades:

3.73 Gearing change
B&M Super Cooler External Trans Cooler with 10" Fan
Transmission Temp Gauge
Hypertech Max Energy Programmer
K&N Air Intake System
Bilstein Shocks
Air Raid Air Bags
Tekonsha Trailer Brake Controller

Does this seem like a good idea or waste for towing 3500 lbs? I will say I am not interested in spending the money to buy a unit with the 4.7l as we just looked into it and this one is almost paid off. Any feedback on your towing experience with the 3.7L would be appreciated.

Cory
Well the w5a580 trans you have is really designed to be a car transmission. It is not meant to tow at all. It is quite possible you will break a shaft in the transmission if you try to tow 3500 pounds on a regular basis. You could try and swap a 545rfe in but it would really be a pain unless you had a complete donor. Your axles and suspension are fine and don't really need mods to tow under 8000 lbs. Your engine should be ok performance wise to tow too.
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