Search results

Part of the problem is my drive shaft guy indicated that due to the length of the drive shaft it would have to be pretty beefy in order to avoid hitting resonance frequency of the drive shaft at normal driving speeds. There may be a clearance issue with the drive shaft in the area where the...

I didn't think Roush changed the driveline, but yours is a good question if they did. I'd probably run right out and get one (or at least replicate it). Dan

My truck behaved very much like yours with the shims installed. All i did was change the speed in which the shutter was felt. At the end of the day they tried just about every combination of the shims just to see if anything would work. Half the time (of all the experimental combinations) it...

I sure wish the service environment was more like your Chevy days. The driveline tech even wanted to have the drive shaft balanced but Ford wouldn't agree to it. It's quite obvious that this TSB is not adequately addressing many of our problems and Ford either has no clue or doesn't want to...

You get a vibration at 1500 RPM regardless of speed? Dan

You mentioned that your truck has a takeoff shudder as well as a sustained shudder between 10-17 mph. At what speed do you have the takeoff shudder? Mine has what I describe as a "take-off shudder" between 10-12 mph. It is very short in duration as it only occurs in that very narrow speed...

Thanks for the information. I'll definitely keep that in mind if the dealer strikes out with my truck. I'm up here in Ogden but I do tend to get down to Salt lake City often. Dan

I have the same wheels you originally had but didn't care for the machined look. I ended up just powder coating them until I can find a wheel I like better. Dan

I brought my truck back to service on Monday because mine also has a high speed vibration at 80 mph which is driving me crazy (the speed limit here in Utah on the 15 just south of Salt lake City is 80). I can handle a little bit of slow speed shutter (until they figure out a positive...

I think most of these that exhibit the problem have it from day one. The issue is unless you are on a fairly smooth road and are looking for it, you are likely to miss it initially (especially in a test drive scenario). In my case it was after I drove it for a while I detected the vibration...

Same as me regarding the slight improvement. Do you experience any high speed vibration?

I agree. The vibration testing I did showed vibration which followed the driveshaft rotation. The truck is back at the dealer as of yesterday and they indicated they were going to focus on the driveshaft. I shared my vibration testing results with them and it seemed to reinforce their efforts...

Had road force balancing done today. STILL getting bad vibration at 85. I reran the test with my phone. The 16 and 32 Hz signals do appear to be lower but the driveshaft frequency still seems to be very prominent. I put the curser at the peak of the 56.89 Hz signal where you can see the...

Today I remeasured vibration frequencies again without the phone case. I seem to get better coupling to the truck without the case. in the attached graph you can see I'm getting spikes at frequencies of 16, 32 and 59 Hz. Measurements were taken at 85 mph. The 16 Hertz is the tire rotation...

I have read about others having the same issue as you. I still have the stock tires on my truck, but that doesn't mean there could be something wrong. They've been balanced a few times already but I'm going to have them road force balance this morning. Up until now I believe they were just...

Phil, I'm using an app called myFrequency. It's on the Google Play store $9.95 Dan

Phil, I'm getting a pretty healthy vibration at 85 mph so decided to do a little experiment. My stock tire size is 265/60/18, so if my math is correct, my wheels are turning 15.6 revolutions per second (assuming 95.88 in circumference) at that speed. At 85 mph, my phone vibration tool was...

Hi Phil, Kind of a bummer about the single piece drive shaft idea. I am at wits end with this high-speed vibration. Wheels have been balanced several times and I'm not sure where to put my focus other than the drive shaft. The driveline guy at the dealership was talking about the drive shaft...

Did they by any chance indicate what the balance was as received from you before they did any of the rework?

hmmmm. I think we'd be hard pressed to get a 5" diameter driveshaft to clear the center bearing crossmember.