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post #1 of 17 Old 07-26-2014, 04:43 PM Thread Starter
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Lift and gear questions for a diesel newbie

Greetings everyone. I am new to diesel trucks....and Ford trucks for that matter. I currently have a Silverado crew gaser with the 5.3. I love the truck but am in need of a 3/4 ton truck. Well I want a 3/4 ton diesel truck, the "need" is debatable. Any way, by Monday I am going to purchase one of two trucks I have deals pending on and wanted some advice from people. One is a 2012 6.7 Lariat crew cab 4x4 and the other is a brand new 2014 6.7xlt 4x4 crew. The Lariat has 3.55 gear ratio and the XLT has the 3.31. I will no doubt be putting a 6-8" lift on whatever truck I get with 37" tires (Nitto trail Grapplers or Toyos MT's) on a 20x10 wheel. My current truck is on a 6" Fabtech with 35's and a Blackbear tune. I don't think I can go back to stock height again.
Anyway I have a 33' bumper pull camper that is about 7k pounds unloaded. I pull it occasionally but it works the Chevy too much and I get 6 mpg pulling it.
I'd rather have the brand new XLT, but the Lariat has a few nicer features and the 3.55. The cost is about 10 bucks different a month on the two so that is not a factor for my decision. At this point, I would like to know if I could get the 3.31 and be ok once it gets the lift and tires? or should I go 3.55 and get the used Lariat (only 20k miles). And I did search, but its seems to be conflicting info on the lift subjects.
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post #2 of 17 Old 07-26-2014, 06:13 PM
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If the price is so close I'd get the 14 and just regear. With that lift, 37s, and that trailer, even 3.55s wont be the best. Now if you were rarely towing thats one thing, but it sounds like you tow a lot.

This is based off responses I see here. I have 35" mts and a 15k lb toy hauler and the power is never a concern, only the weight on the rear tires and stopping. I just dont think you'd be happy with 3.31 and 37's.

2013 F250 Lariat CCSB - Firestone Ride Rite, Bakflip F1, B&W 5th Wheel Hitch, Carli 2.5" with track bar, Fuel Maverick 20x9, Toyo MT 35x12.5, Bushwhacker Extend-A-Fender, Weathertech Mats, Recon 3rd Brake and Mirror Lights, PTM Mirror Caps

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post #3 of 17 Old 07-27-2014, 06:41 AM
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The 6.7 has so much power, it will tow that just fine with 37s in either gear ratio.

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

2007 F-150 King Ranch 4x4 2" Autospring, Bilstein 5100s on all four corners. Nitto A/T 285s.

2005 Chevy Tahoe 5.3l 2WD
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post #4 of 17 Old 07-27-2014, 07:06 AM Thread Starter
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I don't pull the camper that often. It is more of an once every couple month type of deal. I do pull a smaller trailer with atv's and utv, and I have a bow rider boat that is 20' long. Both the boat and small trailer are not a problem for my current truck though. The concern is the upgrading to a larger toy hauler at some point.
I don't think I want to buy a brand new truck and then drop extra cash to regear it. Doesn't seem to be the best route for me. With some type of tuner, (ie superchips etc..) on the truck could/would that help with the 3.31 ratio?
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post #5 of 17 Old 07-27-2014, 07:09 AM
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I would spend the money on deleting the truck and getting a H&S or Spartan tuner before you go re-gearing.

Have you driven a 6.7? It is a beast. It has 800lb-ft from the factory.

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

2007 F-150 King Ranch 4x4 2" Autospring, Bilstein 5100s on all four corners. Nitto A/T 285s.

2005 Chevy Tahoe 5.3l 2WD
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post #6 of 17 Old 07-27-2014, 08:03 AM Thread Starter
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Quote:
Originally Posted by wreedPS View Post
I would spend the money on deleting the truck and getting a H&S or Spartan tuner before you go re-gearing.

Have you driven a 6.7? It is a beast. It has 800lb-ft from the factory.
No I haven't driven it yet. I just wanted to be prepared for down the road. I usually keep my trucks a long time and would rather get it right from the start. So if I understand correctly, the new 2014 with 3.31 would run that setup and still pull a camper occasionally without issue. I assume that it would decrease the fuel mileage vs the 3.55 due to the larger tires but I would think it wouldn't be too drastic. There really isn't a huge difference in 3.31 and 3.55 is there?
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post #7 of 17 Old 07-27-2014, 04:15 PM
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Fordtrix is giving you good advice here. 37" tires with a 3.31 gear is not going to be a good tow rig even with 800 lb.-ft. It'll do it, but I think you'll be disappointed.
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post #8 of 17 Old 07-27-2014, 04:26 PM
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it would still kick arse all over the 5.3 silverado he has now

hell my 6.0 gasser GMC 2500 towed 6k like dog chit with no lift then the tranny ]was starting to make noise my little old 6 liter powerstroke with 37's was just soo much better
that i never thought about that GMC again (and I am a GM guy )

I would get the truck you want then do the lift then decide if you need gears

thats the way I would roll anyway

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post #9 of 17 Old 07-27-2014, 04:59 PM Thread Starter
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My Silverado does what it can with the camper. The Black Bear tune helped quite a bit on the truck with shifting and such after the fabtech lift and added wheels and tire size. It has the 3.73 and 5.3 V8.





I would rather have the brand new 2014, then a used 2012. However if the gear ratio is going to be that noticeable of a difference on a lifted truck then I may just go with the 2012 (Lariat). It will be a few month before I lift due to having to get wheels and tires etc.
The 2012 is certified used so I still get 78k of mileage warranty. Outside of the gear ratio and year...the two look pretty much the same with the Lariat having a back up camera and remote start as the only features the new XLT does not have.
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post #10 of 17 Old 07-28-2014, 04:52 PM Thread Starter
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FYI a typical car salesman.....made promises and then tried to renegotiate after stating one price. So looks like I will be back to searching or picking up the 2012 used truck. If anybody is in North Florida or south GA, Stay clear of Lilliston Ford for your buying needs.
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