Truck Hopping-2011F250 6.7 - Ford Powerstroke Diesel Forum
Suspension & Steering Discuss OEM & aftermarket suspension, lifts, air ride suspension, shocks, steering components, etc.

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post #1 of 11 Old 12-02-2013, 03:16 PM Thread Starter
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Truck Hopping-2011F250 6.7

I put on a 2" coil spacer and the new block in the rear. I got the dreaded death wobble and was told to get rid of the Michelin stock tires, put on a ICON adjustable pan head track bar, new Toyo AT II 295/60/R20 on stock rims and the caster shims? Running 60psi front and rear and the dang truck seems to be "hopping". Truck alignment seems perfect, no swaying or vibration in the wheel but on the highway on some roads, the truck seems to hop? Took the tires back and had them balanced and they are still perfectly balanced. Not sure what to do!
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post #2 of 11 Old 12-02-2013, 03:19 PM
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at around 44-46 MPH? Crew cab short bed?


Keith
2014 F250 Platinum FX4
AFE Intake
Sct x4
4" Dual Exhaust no muffler with 5" MBRP tips
4" BDS with Fox shocks
20x9 Gear Alloy Big blocks 0 offset
35" Toyo AT2's
Procomp Pro runner dual stabilizers
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post #3 of 11 Old 12-02-2013, 03:25 PM Thread Starter
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Crew cab FX4. I notice it the most on the interstate as I am rolling at 50 plus and even deaccelerating. Seems just a little better from dropping air pressure from 65 down to 60 but I really do not want to go lower. I thought about getting ICON replacement springs and their Bilstein 5100 shocks. Soooo frustrated! I had some Toyo ATII's I tried first which were a little wider but shorter but did not fit well on the stock rims and I felt like the front end was floating. I love these tires! Thank You so much for you and anyone else that can help!

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post #4 of 11 Old 12-02-2013, 03:28 PM
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Yea I run my tires at about 50 in the back and 55 in the front I think but I have a steady bounce at 44-46 all the time and a ton of CCSB trucks do that for some reason. Do you have a one piece drive shaft?


Keith
2014 F250 Platinum FX4
AFE Intake
Sct x4
4" Dual Exhaust no muffler with 5" MBRP tips
4" BDS with Fox shocks
20x9 Gear Alloy Big blocks 0 offset
35" Toyo AT2's
Procomp Pro runner dual stabilizers
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post #5 of 11 Old 12-02-2013, 03:34 PM Thread Starter
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I have whatever is factory which I assume that is a single solid drive shaft. It never did this before the new tires and track bar with just the stock Michelin tires. Rode like a DREAM! (but again, I did this all because of the death wobble experience I had). Again, thinking of going with Icon coil and their schocks and see what happens.
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post #6 of 11 Old 12-02-2013, 03:50 PM
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did you have the tires road force balanced?


Keith
2014 F250 Platinum FX4
AFE Intake
Sct x4
4" Dual Exhaust no muffler with 5" MBRP tips
4" BDS with Fox shocks
20x9 Gear Alloy Big blocks 0 offset
35" Toyo AT2's
Procomp Pro runner dual stabilizers
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post #7 of 11 Old 12-02-2013, 04:08 PM
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In my experience the wider tires seem to bounce more, air pressure seems to play a factor as well. I run my 37's with 40psi front and 35psi rear, I only air up to max psi when loaded or towing.
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post #8 of 11 Old 12-02-2013, 04:13 PM Thread Starter
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Yes, I sure did. These tires are like barely barely wider than the stock Michelins so that is why I went to them plus I did not want any road noise or crazy tread. These are 10 ply load range E 80psi tires! The guys up in Atlant at 4wd parts said that I could drop the air even more and never have an issue driving or towing but I did not do all this to have to make these type of changes. I bet ya that my Michelin stock tires do not do this!

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post #9 of 11 Old 12-03-2013, 07:05 AM
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Quote:
Originally Posted by baja25sst View Post
Yes, I sure did. These tires are like barely barely wider than the stock Michelins so that is why I went to them plus I did not want any road noise or crazy tread. These are 10 ply load range E 80psi tires! The guys up in Atlant at 4wd parts said that I could drop the air even more and never have an issue driving or towing but I did not do all this to have to make these type of changes. I bet ya that my Michelin stock tires do not do this!
Your stock Michelins has thinner sidewalls and less air volume in them. On bigger E-Rated tires like this you need to run less air pressure than you would on smaller stock tires. Like others have said I would drop the fronts down to around 45 and the rears down to 35.

Since you lifted the truck and are still running stock shocks (which may be too short) the shocks are having hard tires controlling the heavier, stiffer, overinflated tires. A combination of lower pressure and possible better shocks should calm things down assuming that there aren't other problems at play.

Think of it like a 6 year old boy trying to dribble an oversized, overinflated basketball. That is what your suspension is trying to do right now.



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post #10 of 11 Old 12-03-2013, 08:58 AM Thread Starter
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I have brand new fox schocks that were put on to work with the new lift kit. Won't dropping this much air also kill my gas mileage?
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