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Old 12-31-2014, 12:40 PM   #11
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I was never impressed with my 2006 6.0L. While it had power, I thought it was lacking by today's standards, with only a little over 300hp. My biggest complaint was in the transmission though. Always searching for a gear, and while it had power to pull, the transmission was constantly downshifting, and high revving the engine, which drove me crazy. Pulled my 7200lb TT one season with it before I traded it in. I do believe you could do some valve work and tuning on the trans to make it better, I had great results with Level 10 upgrades in the past. Getting the power to the ground has better results than increasing the power.
X2...had a 2009 Sierra 6.0, loved the truck but hated the power train setup
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Old 12-31-2014, 01:25 PM   #12
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The rear axel is 3.73 and it is a 4x4. I thought about changing the rear gears to 410 but I would have to do both front and back because it is a four wheel drive. I'm looking more into bolt on parts, like intake and exhaust. I appreciate your suggestions and comments. I want to do something without going to the extreme.
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Old 12-31-2014, 03:14 PM   #13
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The rear axel is 3.73 and it is a 4x4. I thought about changing the rear gears to 410 but I would have to do both front and back because it is a four wheel drive. I'm looking more into bolt on parts, like intake and exhaust. I appreciate your suggestions and comments. I want to do something without going to the extreme.
Don't waste money on "cold air intakes", your truck has more than enough breathing room, and the gains are minimal at best. I ran only a slightly modified stock air box on a supercharged 5.7L with no problem. I still think money is best spent at the transmission. A reworked valve body and a tune will make the truck act completely different for less than you would spend on other add ons.
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Old 12-31-2014, 04:33 PM   #14
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I was happy with some noticeable improvement from a Diablo tuner. No need to send out computer for rework. Plus, you can make mods to tranny shift pressure and shift points. You can also log performance data and email that to Lew and he can email a "custom tune" back for your exact conditions. I bought mine used on a truck forum for $300, I think they are like 400 new. You can also read OBD codes. Probably your best bet because you get to mod engine and tranny with one item. I have a k&n filter in my factory air box, not sure about improvements but I like it better than the paper style. I am still debating the cam change. Turbo or supercharging would be great but $4-6k. "How hard can you afford to make it pull".

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Old 01-01-2015, 08:53 AM   #15
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I'm surprised that you're not pleased with your truck's performance. I pull the exact same camper that you have with an F150 and the 3.5L Ecoboost with a 3.55 gear. I've put almost 3000 miles on it in the last 6 months pulling to Charleston SC, east Tennessee mountains, Virginia, and eastern Kentucky. Never short on torque or speed, cruising at 70-72 mph @ 2000-2200 RPMs in 5th & 6th gear 98% of the time. The occasional downshift to 4th is only on the steepest interstate grades.
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Old 01-01-2015, 09:42 AM   #16
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If you plan on keeping this truck for awhile and towing with it frequently, the gear swap in both axles is the way to go. You'll lose some MPGs, but you'll be happier with the towing. My truck came with 3.42 rears and swapped to 4.10. I wouldn't trade the towing torque back for the mileage I lost. Good luck!
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Old 01-01-2015, 10:01 AM   #17
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You have a couple of options, while neither are cheap, they'll likely give you what you're looking for.

Option A, a supercharger such as the mentioned Edlebrock Eforce unit. You can get these as bolt on kits complete with a tuner so you can properly retune the engine and transmission controls. They're relatively low boost, so extra engine strain is minimal while gaining about 100 horsepower.

Option B, get a Gear Vendors under drive unit. They bolt in between the transmission and the transfer case and you can select a ratio that will give you the results you want. So if you want to end up with an effective 4.30 setup you order a unit with a 14% under drive. Then, flip a switch and the unit switches gear back to normal and you're back to your 3.73 ratio. So if you're happy with its high gear performance but want more getting out of the intersection then you have the best of both worlds.
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Old 01-01-2015, 11:16 AM   #18
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Option B, get a Gear Vendors under drive unit. They bolt in between the transmission and the transfer case and you can select a ratio that will give you the results you want. So if you want to end up with an effective 4.30 setup you order a unit with a 14% under drive. Then, flip a switch and the unit switches gear back to normal and you're back to your 3.73 ratio. So if you're happy with its high gear performance but want more getting out of the intersection then you have the best of both worlds.
Interesting! I've have not heard of such a product before. I'm going to google it out of curiousity.

Edit: Googled it. Yikes! $3,000 plus and installation cost. Cool product though.
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Old 01-01-2015, 01:08 PM   #19
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Interesting! I've have not heard of such a product before. I'm going to google it out of curiousity.

Edit: Googled it. Yikes! $3,000 plus and installation cost. Cool product though.
Yeah, like I said they're not cheap. But they're an excellent solution and cheaper than another truck. But cost more than a front and rear gear swap, so it's up to the buyer.
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Old 01-01-2015, 02:38 PM   #20
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Not sure about the newer under drives, but the earlier ones were noisy and problematic.


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