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Old May 19th, 2008, 11:56 AM   #1
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Default Towing a Jeep with 3:55s

I got fantastic gas milage in my truck driving 60mph this weekend.

I'm thining about swapping my gears to some 3:55s so I can travel at roughly 70mph at the same RPM at 60mph in the present.

It's a diesel so I have the torque and the only think I hall is my Jeep so I'm not really worried about the loss of power. And taking a long time to get up to speed won't bother me either. If I pulled a trailer everyday I won't consider this option but since I pull my jeep once a month, maybe two times a month say 1 out of every 3 months I don't think it will bother me.

So what do you guys think?

Thanks in advance for your thoughts!!
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Old May 19th, 2008, 12:05 PM   #2
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MY f250 manual has 3:55s and I don't have any problem hauling that much weight. I still drive 60 because even though you're getting the benefit of lower RPM, there's still a square on the aerodynamic force. I get really close to 17 with my camper in the bed and my trailer in tow.
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Old May 19th, 2008, 12:11 PM   #3
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My truck has 3.55.

I've been pulling that 24' enclosed (10,000 loaded) around without much of a problem... but I also have a few power adders
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Old May 19th, 2008, 12:12 PM   #4
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my old diesel has 3.55 and got 16mpg towing my brown truck at 65mph. i wouldn't hesitate to switch.
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Old May 19th, 2008, 12:14 PM   #5
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I tow with 3.55s with my V10. I don't have any issues. It was the stock gearing for V10 and diesel dodge rams.

Normal trailer is 6000 lbs, but I have pulled 9000lb behind it, and it feels fine. Towing 9000lbs (large tractor) at 65 mph, I got 11mpg. Towing my toyota at 70 mpg, I get 10 mpg.
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Old May 19th, 2008, 12:28 PM   #6
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Quote:
Originally Posted by Bones View Post
My truck has 3.55.

I've been pulling that 24' enclosed (10,000 loaded) around without much of a problem... but I also have a few power adders
YOU were how I was hoping would respond the most becuase the guts of my truck will hopefully be similar to yours with a much sleaker body style :bling: :bling:



I'm buying the power back for the SD from Stealth Auto which is a T-Wildman 6place chip, 4" exhause, gauges. And I've got the DIY tymar now with the ZooDad mod.


Thanks for responding guys. I might be making a trip up to my boys in K-zoo for a little gear work.
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Old May 19th, 2008, 12:29 PM   #7
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I get 35 mpg towing with my truck, I have 3.73's.

The cost of the gear swap is going to take you a LONG time to pay for in fuel savings. Do the math.
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Old May 19th, 2008, 12:30 PM   #8
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Thanks for responding guys. I might be making a trip up to my boys in K-zoo for a little gear work.
You have children in Kalamazoo!?
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Old May 19th, 2008, 12:36 PM   #9
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You have children in Kalamazoo!?
no, more of a getto slang meaning people who make Jeeps and other 4x4's oustanding!
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Old May 19th, 2008, 09:58 PM   #10
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.

The cost of the gear swap is going to take you a LONG time to pay for in fuel savings. Do the math.
Especially in a SD, aren't gears big $$$$ for them?
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Old May 20th, 2008, 10:46 AM   #11
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Sounds like a huge waste of money to regear and then turn around and put a chip/computer mod in. And for what? A MPG or two?
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Old May 20th, 2008, 11:58 AM   #12
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A MPG or two?
the difference will be 2-3 mpg, and a fair amount less in-cab noise

the 7.3 isn't exacty stealthy
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Old May 20th, 2008, 12:06 PM   #13
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the difference will be 2-3 mpg, and a fair amount less in-cab noise

the 7.3 isn't exacty stealthy
I'm saving up for the Powerbundle from Stealth (TW Chip, Gauges and Exhaust) but would I bennifit from straight piping it until I buy those products . . . is it worth it?
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Old May 20th, 2008, 12:08 PM   #14
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do you still have the stock downpipe? I don't think a muffler or cat delete is worth the trouble if you still have the stock downpipe.
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Old May 20th, 2008, 01:05 PM   #15
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do you still have the stock downpipe? I don't think a muffler or cat delete is worth the trouble if you still have the stock downpipe.
Yup, still stock but it's not a Vacum attachment like on the Old Body style. I was just thinking it would be a little less restriction and a lot louder out back which is probably worth it just to piss of my neighbor that I don't like
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Old May 21st, 2008, 08:53 PM   #16
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Yup, still stock but it's not a Vacum attachment like on the Old Body style. I was just thinking it would be a little less restriction and a lot louder out back which is probably worth it just to piss of my neighbor that I don't like
Us OBS guise like to call the stock downpipe the "tapeworm".
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Old May 21st, 2008, 10:33 PM   #17
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bigger tires if there is room? probably would be cheaper/faster.
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Old May 22nd, 2008, 10:09 AM   #18
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bigger tires if there is room? probably would be cheaper/faster.
I'm running 285's now and they look really little with the leveling kit up front. maybe 315s when the time comes for new tires?
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Old May 22nd, 2008, 10:52 AM   #19
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I'm running 285's now and they look really little with the leveling kit up front. maybe 315s when the time comes for new tires?
the point he is trying to make is that bigger tires gives you effectively a higher gear ratio (smaller number).

maybe it would be more cost effective to switch to the largest tire you can and sell your current tires, instead of regearing
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Old May 22nd, 2008, 11:01 AM   #20
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Quote:
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the point he is trying to make is that bigger tires gives you effectively a higher gear ratio (smaller number).

maybe it would be more cost effective to switch to the largest tire you can and sell your current tires, instead of regearing
Yeah, I understood. and a good suggestion.
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