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How to know tow capacity after a 3.5 lift and 37's?

Dainbramaged

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We're having a 3.5 Clayton Overland lift with 37 x 12.5 Trail Grapplers in a couple weeks (along with Mopar's trailer brake control) in our auto 3.6l JTR. How can I figure out what impact these changes have to my towing capacity? We just bought an Imagine 17MKE, which has a 6400 GVWH, so already towards the top of the original 7,000 max. Can I stay with this lift/tire combo?
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sarguy1941

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Weigh all the parts before they go on and subtract from your tow rating....Thats a heavy trailer for a 17 footer.
 

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If you are running the 4.10 gearing still you will be reducing your towing capacity by both the added weight and the gearing. Get the gearing back to factory at minimum. Running 4.88 or 5.13 gearing depending on use of the Jeep will get you better than stock. Then the only real impact is the added weight.
 
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Dainbramaged

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I appreciate the feedback Paul/Jeff. Our shop was recommending that with that heavy a trailer that we stick with 4.56 or maybe 4.88, but to first do a couple tows in the areas we'll most likely visit and then make the decision on the $2k+ regear investment. Sounds like I can just factor in the extra beefiness of the Clayton components and extra weight of the tires when doing my payload calculation and I don't have to worry about the lifted suspension itself impacting the tow rating.
 

Phljeeper

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I appreciate the feedback Paul/Jeff. Our shop was recommending that with that heavy a trailer that we stick with 4.56 or maybe 4.88, but to first do a couple tows in the areas we'll most likely visit and then make the decision on the $2k+ regear investment. Sounds like I can just factor in the extra beefiness of the Clayton components when doing my payload calculation and I don't have to worry about the lifted suspension itself impacting the tow rating.
Yes, I would agree except I would skip the 4.56 and do 4.88. Some prefer 5.13 and others seem to prefer 4.88 but doesn't seem worth it to do just 4.56. The only other impact you will see is a small impact on the wind resistance due to the lift. Your lift will reduce the factory rake and increase height making the flat front of the Jeep and the relatively flat windshield less aerodynamic (not that factory is super aerodynamic) causing more drag. The 4.88 being a bit better than stock on 32s will help some with that but you will have an impact due to lift and tires. I have no issues towing my 5200 lb dry travel trailer with 37s, 4.88 gearing, 2.5" EVO lift, steel bumper, winch though so you shouldn't have any issues post regear. You will have to embrace that the Gladiator is not a full size truck with a V8 or supercharged 6 though when you hit hills.
 

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Dainbramaged

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Yes, I would agree except I would skip the 4.56 and do 4.88. Some prefer 5.13 and others seem to prefer 4.88 but doesn't seem worth it to do just 4.56. The only other impact you will see is a small impact on the wind resistance due to the lift. Your lift will reduce the factory rake and increase height making the flat front of the Jeep and the relatively flat windshield less aerodynamic (not that factory is super aerodynamic) causing more drag. The 4.88 being a bit better than stock on 32s will help some with that but you will have an impact due to lift and tires. I have no issues towing my 5200 lb dry travel trailer with 37s, 4.88 gearing, 2.5" EVO lift, steel bumper, winch though so you shouldn't have any issues post regear. You will have to embrace that the Gladiator is not a full size truck with a V8 or supercharged 6 though when you hit hills.
Much appreciated Paul, it's great to hear from somebody towing that it's working out. Sounds like a re-gear is an almost certainty with 4.88's being a good consideration for extra torque without giving up too much strength.
 

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No way to figure it exactly but IMO a JT with 37s would have a much lower tow capacity unless you upgrade a lot of other things such as brakes and gearing but even then it still will not be as designed due to a much higher COG which the stability program is not designed for.
 

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Dainbramaged

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I did a thread on this a while back. Essentially there is no "official" answer, just like no telling how towing will be affected by larger tires. Jeep cant tell you how your payload or towing is affected even with their Mopar lift.

https://www.jeepgladiatorforum.com/...ze-gear-ratio-affect-on-payload-towing.24058/

https://www.jeepgladiatorforum.com/forum/threads/regearing-and-towing.24572/

https://www.jeepgladiatorforum.com/forum/threads/performance-cost-benefit-to-accessorizing.24139/
This is fantastic information, thanks for the link as I missed it when searching the topic myself.
 

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Weigh all the parts before they go on and subtract from your tow rating....Thats a heavy trailer for a 17 footer.
Using this method you'd want to weigh the parts that come off and add it back though? Weighing the whole rig before and after is the easiest way.
 

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Using this method you'd want to weigh the parts that come off and add it back though? Weighing the whole rig before and after is the easiest way.
Wow, 4 and a half years later! That must be a new record for thread resurrection here!
 

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There's nothing you can do to change the tow rating of the truck, either up or down. It's tied to the VIN. Can't go over the GCWR regardless of how much the truck or trailer weighs individually.

7700lb trailer tow rating is based on a 4750 Jeep weight (12,450 total gcwr), but if you've got 4 300lb men in the cab and 2000lb of gear and aftermarket accessories in the Jeep, that 7700lb is going to be substantially less
 

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There's nothing you can do to change the tow rating of the truck, either up or down. It's tied to the VIN. Can't go over the GCWR regardless of how much the truck or trailer weighs individually.

7700lb trailer tow rating is based on a 4750 Jeep weight (12,450 total gcwr), but if you've got 4 300lb men in the cab and 2000lb of gear and aftermarket accessories in the Jeep, that 7700lb is going to be substantially less
So mods that add weight reduce it and lightening mods increase it. Take the top and doors off and I can tow an extra 200lbs. I guess it's a good thing we aren't using gladiators for commercial hauling so we will never end up getting weighed anyway.
 

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Step 1: Necro a thread that's almost 5 years.

Step 2: Parrot the exact same talking points from every other tow capacity thread yet again.

Step 3: ......

Step 4: Profit?
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