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  #1  
Old 09-22-2011, 12:03 PM
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Default What affect does a lift and large tires have on Towing?

This truck is my first Pick-up and I assume the lift and probably, most likely the tires are affecting the towing. I used to trailer my Snowmobile with the wifes Yukon (v8 5.3) and it would pull the trailer no problem. I used the Dodge in the winter and it seemed to have a harder time pulling the trailer around. Thoughts? Remedies?
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Old 09-22-2011, 03:36 PM
hemidan345 hemidan345 is offline
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if your going to continue to tow with a lifted truck with large tires you need to change your final gear ratio you prob have a 3.73 or 3.55 go to an off road shop they can figure out what gear ratio you should have with the tire increase. the lift only affects the towing capasity.
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Old 09-22-2011, 03:39 PM
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Like he said larger tires give you a disadvantage with gearing. It is expensive to switch gears though... especially if you are 4x4...

I don't know about how lift effects it but shouldn't change much I wouldn't think...
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Old 09-22-2011, 04:13 PM
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The lift raises the center of gravity (center mass of the truck) so now your load is behind and under that center mass. This will affect towing power a little bit. The biggest issue here is the larger tires, which change your effective gear ratio. You have two solutions...go back to stock on the tires and wheels (which will look really funny on your lifted truck) or re-gear to a 3.92 or higher ratio. Heck, look at it this way...a 3.92 posi is better than the 3.55 or even lower, ratio with an open diff.
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Old 09-22-2011, 05:48 PM
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Quote:
Originally Posted by MADDOG View Post
The lift raises the center of gravity (center mass of the truck) so now your load is behind and under that center mass. This will affect towing power a little bit. The biggest issue here is the larger tires, which change your effective gear ratio. You have two solutions...go back to stock on the tires and wheels (which will look really funny on your lifted truck) or re-gear to a 3.92 or higher ratio. Heck, look at it this way...a 3.92 posi is better than the 3.55 or even lower, ratio with an open diff.
Hey Maddog. Do you mind explaining wht a 3.92 is better than a 3.55? What affect will a 3.92 have on everyday driving? I notice that even without towing, going up even slight hills the engine will have to drop a gear to maintain speed. It gets kind of annoying. will 3.92 gears further kill economy?
Thanks.
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Old 09-22-2011, 07:57 PM
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Hey Maddog. Do you mind explaining wht a 3.92 is better than a 3.55? What affect will a 3.92 have on everyday driving? I notice that even without towing, going up even slight hills the engine will have to drop a gear to maintain speed. It gets kind of annoying. will 3.92 gears further kill economy?
Thanks.
I'll let maddog answer but I'll throw input in as well. It's like riding a mountain bike, and some gears make it easier to pedal at slow speed (higher numerical ratio....for example 3.92 easier than 3.55), but it also makes your legs spin faster once up to speed (3.92 would be at a higher cruising rpm than 3.55 would). 3.92 would make the truck accelerate easier/tow easier. It would actually probably help your city mpg as it's easier for the heavier truck to get up and go, and typically higher numerical gearing will decrease hwy mpg, but the 3.92 isn't very high and with larger tires it shouldn't hurt you much if at all...
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Old 09-22-2011, 08:36 PM
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My truck had 3:92 gears from the factory, but never started towing a party barge until i put on the 6" lift and 37s. I feel like my gears are bare minimum and wouldnt mind a little more gear especially when I go up a hill or up a boat ramp. I drove my friends full size with 3:50 gears and 35's and it was a slug even not towing.
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Old 09-22-2011, 08:49 PM
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It looks to me like your truck is on 37s.
Lets just say when your truck was stock you had 3:55s with stock 265/75/17s (about 31" diameter). When you put 37s on it takes alot more to turn the bigger heavier tires. In theory you changed your ratio to maybe a 3:31 (not real numbers just figurative)
To get back to what it feels like with a stock truck you'll need 4:88s but if your looking for more torque you could go with 5:13 or 5:29s.
By keeping stock gears with larger tires your also hurting your mpg, regearing will help.
If I'm wrong and your on 35's 4:10s are the gear that will put you back to about stock
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Old 09-23-2011, 08:20 AM
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Does anyone know a estimated price to change the gearing? My Truck is a 4X4.
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Old 09-23-2011, 08:25 AM
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Does anyone know a estimated price to change the gearing? My Truck is a 4X4.
There is a large range but for a 2wd it is usually about $500-$1500 depending on if you get a limited skip differential as well. I'd say double that for 4wd.
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