94 superduty bad shake,wobble,vibration!!

[tbirdfiend281]

well if its causing you problems and its expensive, you know...you do have gears, sure it limits you slightly with the truck but its probably managble, but it is your truck

 

[towcat]

well if its causing you problems and its expensive, you know...you do have gears, sure it limits you slightly with the truck but its probably managble, but it is your truck

finding the source of the problem is the priority.
leaving the truck in gear to keep it from moving is not a option. the motor needs to be running so the PTO and hydraulics can be working. I have a ZF5, he has a E4DOA. There is no "park pawl only" option for him when loaded at 15k . Priority is to find the problem and fix it.
here's the OT part. I understand you are a 19 yr old apprentice diesel tech. Here's a suggestion. Watch the senior guys carefully. The good ones have managed to not only get the job out the door without loosing fingers and toes, but also keep from getting fired due to getting hanged by DOT for bad work or worse yet, their work was the cause of a multimillion dollar lawsuit on the company due to findings of bad work. You are entering the realm of commercial vehicles, the pay is better and so are the penalties if you do shoddy work. Think about it.

 

[94f450sd]

i have to have an ebrake,besides there is no way to remove it completely from the truck anyways.my trannies output shaft is the same as a 4WD tranny.so i cant just take the ebrake off,put a tailhousing on it and use the correct yoke on the driveshaft.besides i wont get a sticker without it,DOT wont like it much,and i wont be able to keep the truck from moving while loading a car on the stinger.it sux when you put the stinger against a bumper and it jerks the truck forward and then it slams back into the bumper of that nice new car.junkers i could care less but when doing a repo i am responsible for any damages done to the cars.

but anywaysive been stayingoff the highways with it for now till i decide what direction im gonna head in.just got a call today for a repo/sheriff siezure account.hopefully everything goes through.ifit does ill spend the 1800.00 for the ebrake and hope its the problem as this will be a huge account that will require my truck,my friends 3 trucks,another friends 1 truck and possibly me buying a second truck and hireing a driver.

 

[RKOCH]

I would still balance that shaft before you bought an e brake.

 

[tbirdfiend281]

finding the source of the problem is the priority.
leaving the truck in gear to keep it from moving is not a option. the motor needs to be running so the PTO and hydraulics can be working. I have a ZF5, he has a E4DOA. There is no "park pawl only" option for him when loaded at 15k . Priority is to find the problem and fix it.
here's the OT part. I understand you are a 19 yr old apprentice diesel tech. Here's a suggestion. Watch the senior guys carefully. The good ones have managed to not only get the job out the door without loosing fingers and toes, but also keep from getting fired due to getting hanged by DOT for bad work or worse yet, their work was the cause of a multimillion dollar lawsuit on the company due to findings of bad work. You are entering the realm of commercial vehicles, the pay is better and so are the penalties if you do shoddy work. Think about it.

i dont do shoddy work i dont get come backs, its a goal of the way i work, that being said, from what i understand as his description of how he has gone about hunting down the problem, he has not properly diagnosed the suspect component, but i dont know the full story and backround of everything either. im assuming hes throwing parts at the truck instead of actually, if he has accsess to them, using the proper tools to narrow down to at least the system that is causing the vibration.

im unfamaliar with the older stuff as i am in a dealer, i have seen his style e brake but have not actually serviced one before, and didnt know the specifics of what kind of modifications to his system could be done, my apologizes. im above and beyond a shoddy worker, if i was i think id go slit my wrists right now lol, as it bothers me to no end if the problem is not fixed, im pretty sure i have some form of ocd. i was merely making uneducated small talk guesses at what could be done, being as i cant actually go about a diagnosing process online.

but ya im more in the 02+ spectrum of fixing the ford trucks i rarely see a truck older then a 99 now a days, bieng ford and a dealer...i would like to change that though

 

[Ak HDM]

As was mentioned earlier, how long is the longest section of the driveline ?
I know on class 8 trucks with heavy wall driveshaft tubing, the recommended longest is only 60 inches. Do you know any one that has the Spicer driveline angle analyzer program on their computer? The lengths, angles & size can be entered and it will tell you if it is within limits for vibration. I assume the rear bearing in the trans is good.
I know the class 8 truck dealers here have the Spicer program & use it a lot for vibration problems. Alot of the time pinion angle has to be changed.
Hope this will help
Mike

 

[94f450sd]

the wheel base is almost identicle to a crew cab 8' bed pickup.i think its 4 inches longer.im gonna take it to the driveshaft place maybe tomorrow and just have 2 new shafts made for it.i just have this gut feeling that it is the ebrake.i just dont wanna spend the money for it if i dont have to.

 

[Ak HDM]

Another thought,can you have the drum for he E-brake checked for balance at the driveshaft shop? All the E-brake drums I've seen had balance weights on them. I have to admit I'm not very familiar with the older F-450's, I'm just going by experience with medium/heavy trucks.
Mike

 

[94f450sd]

according to ford the ebrake assembly is only serviceable by replaceing the whole thing,unless you got connections like i do and can order the parts seperately.i also found out that when you do service it you need to mark every piece including the nuts/bolts to make sure they go back in exactly where they came out.i never did that.thats why i have the gut feeling its the ebrake.i just dont want to spend 1800.00 on it to find out it isnt the problem or i could buy a whole parts truck for that money

 

[Ak HDM]

Can you change the position of the drum on the flange & drive it ? I know it will involve time. Or maybe you've already tried this. I know what you mean about spending $1800 & still having the problem. I'm kind of thinking that the flange and drum were balanced as a unit with the drum at a certain spot on the flange. The trick will be finding that spot again. Also, are the u-joints in time [lined up] ? Just some thoughts to maybe help.
Mike

 

[94f450sd]

i have tried everything short of replacing the ebrak,replaceing/balancing the driveshafts.

 

[Ak HDM]

How about motor mounts, if the engine is shifting around,it could cause severe changes in driveline angles. I'm running low on ideas other than checking the balance on the shafts.
Mike

 

[94f450sd]

o k well i just spent another 750.00 on it.found a new E brake on ebay,got it for 660.00 put that in along with all 3 new u joints,carrier bearing and steering stabilizer.no change -Deadhorse -Deadhorse .gonna try new front shocks in the morning as they have been in there for 3 years now and hope it helps.

 

[zigg]

I've been battling what sounds like the same kind of vibration issue on my '86 for about 3 years now. I've replaced everything. Still shakes. I even welded my front D50 ifs into a solid unit and replaced the springs....Still shakes.

I paid big bucks for a new driveshaft, new u joints, all nicely balanced up to 3,500 rpm, and still shakes..

I put all new bearings in the tranny/t case,,,still shakes...etc, etc, etc.

I've had it to driveline specialists, frame shops, front end guys etc, None has been able to figure it out...

Still shakes....

I've decided to give up, and I bought another truck...

Here's hopin...

Zigg

 

[krawlr]

all crossmembers are tight the panhard mount is tight.the panhard bar is new also.when i stretched the frame everything was checked a million and half times before,during and after it was welded,its straight.the slip yoke was replaced also.i havent had the shafts balanced,maybe ill try that next.

ive also had the back of the truck off the ground and put in drive,brought it up to 65MPH and there is no vibration.ive run it up to 90mph without a vibration.

When you did this, was it supported on the axle or the frame (allowing it to hang). Maybe you changed driveline angles with it jacked up???

I'm running a 3 piece setup. Big fun getting the angles right.