Shutter when Accelerating. - Ford Powerstroke Diesel Forum
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Old 08-02-2011, 01:56 PM
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Question Shutter when Accelerating.

I have a bit of a problem. I had my truck at the dealership to diagnose a shutter when accelerating. They informed me that it was due to my transmission not being programmed to my aftermarket tires. I asked them to flash the program for my size tires to eliminate the problem but they said that they did not have a program available for my size tire. I have an '08 with 35x12.5x20, not an uncommon size, I would think. Can anyone help me out with advice on how to, or what would, correct this problem.
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Old 08-18-2011, 12:54 AM
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Mine does the same thing. A lot of shutter when I have the 5th wheel hooked up and low speeds and hard acceleration (0-25 or so). The pin weight is quite heavy, so I considered that it was actually driveline angle causing the problems. I had a CJ7 that this exact thing years ago. I'm looking at airbags now. BTW, I have the stock tires on the truck.
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Old 08-18-2011, 09:37 AM
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I thought the newer trucks came stock with 35" tires?
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Old 08-20-2011, 09:10 PM
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It is due to axle wrap and your u joints, you need to install a set of traction bars as anyone does that tows or has a tuner.. It will help both situations and smooth out any hard shifts
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Old 09-20-2011, 08:19 AM
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Quote:
Originally Posted by airforcex2 View Post
Mine does the same thing. A lot of shutter when I have the 5th wheel hooked up and low speeds and hard acceleration (0-25 or so). The pin weight is quite heavy, so I considered that it was actually driveline angle causing the problems. I had a CJ7 that this exact thing years ago. I'm looking at airbags now. BTW, I have the stock tires on the truck.
I had the same problem, air bag install fixed it.
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Old 09-20-2011, 01:47 PM
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I've been getting a shutter when accelerating hard sometimes from a slower speed, usually 35-45. Would traction bars be the way to go?

James.
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Old 11-01-2011, 06:17 AM
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i had same problem so i brought it to my mechanic and it ended up i had to put a spacer in the carrier bearing to drop it further from the truck now its 100% gone
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Old 11-08-2011, 09:19 PM
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Hope this helps

I know exactly what you guys are talking about. My 08' did it when it was stock, but got worse when I put a lift and H&S 300 tune on it. With the lift and tune the transmission would also have trouble sometimes between 2nd and third gear especially on very hard exceleration.

I installed unitized 10" lift blocks and traction bars from Newton Lifts and the problems are completely gone. I video taped the terrable axle wrap before the bars and I suspect that was a big part of the problems. Now I have ZERO axle wrap, shudder, and shift problems! It feels like a completely different truck.

I know it sounds like i'm advertising for Newton, i'm not, but i'm just that impressed with the quality, price, and difference it made...$650 for a complete custom built setup.
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acceleration, shudder, transmission

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