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Hey you all, i posted here about a month or two ago because i had bought a 97 CCSB 7.3, i have gotten paid and have started working on the truck
After two months of driving, rediculous vibrations but ill be damned if it always started and got me to the place i needed to go.
its the driveshaft for sure, before i fixed it i had alot of vibration between 20-30 mph, and when i slow down. like a jackhammer hitting the side of the truck, worse than riding rumble strips, after 30, it would clear and only vibrate at high speeds, but only for a few seconds then quit, randomly.
I replaced the carrier bearing housing ( Carrier bearing i got from autozone was too small, but the housing still fit. )
Checked all ujoints, one cup seems to have a little play in it that may need to be replaced but i got the wrong size so i have to take them back and get the bigger ones ( seems like every part i bought that day was too small lol )
my question is, what would you all do about it. Its alot better now, the vibration is alot less but its also at 30-40 mph, also just like before its there when i slow down. if i use the clutch to slowly downshift, it kills the vibration.
should i order a new driveshaft? and if so from where? they seem to be insanely high or not findable. or can i take it and have it ballanced to get it out.
PO said that a yoke failed with a 5th wheel and it bent the driveshaft, but im not so sure thats the case as it doesnt appear to have any damage to it, like damage from hitting concrete or something like that, unless he literally twisted it and it bent.
Do you still have the original dual mass fly wheel in the truck? If so it sounds like the center bearing in the DMFW is failing, letting things get out of balance, since you said that pushing the clutch in stopped the vibration. If the PO had the driveshaft apart, did he get u-joints on both ends timed so they are in alinement? Having the joints out of alinement can cause a vibration.
Do you still have the original dual mass fly wheel in the truck? If so it sounds like the center bearing in the DMFW is failing, letting things get out of balance, since you said that pushing the clutch in stopped the vibration. If the PO had the driveshaft apart, did he get u-joints on both ends timed so they are in alinement? Having the joints out of alinement can cause a vibration.
Im not sure, however if there’s anyway to check I’ll do that because I don’t see why it would be Vibrating from what I can see alone, so it may be the flywheel. It makes an awful rattling noise from the trans when I don’t have the clutch pushed in when in neutral, like a scraping rattling sound, since I’ve had the truck I always keep the clutch pushed in no matter where I go if I’m not in gear
Im not sure, however if there’s anyway to check I’ll do that because I don’t see why it would be Vibrating from what I can see alone, so it may be the flywheel. It makes an awful rattling noise from the trans when I don’t have the clutch pushed in when in neutral, like a scraping rattling sound, since I’ve had the truck I always keep the clutch pushed in no matter where I go if I’m not in gear
You can check the DMF by removing the dust cover on the bottom of the bell housing on the tranny. With the motor off, tranny in gear, try and rotate the flywheel back and forth. If you can rotate it more than 5/8 of an inch, the flywheel is bad. The DMF as dampener springs in the assembly, rather than in the clutch plate. Over time these springs weaken and fall out. By the way you are describing things, I'd say the flywheel is toast. Take a good look at the tranny bell, when the center bearing failed on my 97, it cracked the bell, resulting it a different tranny.
You can check the DMF by removing the dust cover on the bottom of the bell housing on the tranny. With the motor off, tranny in gear, try and rotate the flywheel back and forth. If you can rotate it more than 5/8 of an inch, the flywheel is bad. The DMF as dampener springs in the assembly, rather than in the clutch plate. Over time these springs weaken and fall out. By the way you are describing things, I'd say the flywheel is toast. Take a good look at the tranny bell, when the center bearing failed on my 97, it cracked the bell, resulting it a different tranny.
So if the flywheel is bad it can be replaced, like the bearings and stuff being bad but the bell being cracked will require a new tranny
You can check the DMF by removing the dust cover on the bottom of the bell housing on the tranny. With the motor off, tranny in gear, try and rotate the flywheel back and forth. If you can rotate it more than 5/8 of an inch, the flywheel is bad. The DMF as dampener springs in the assembly, rather than in the clutch plate. Over time these springs weaken and fall out. By the way you are describing things, I'd say the flywheel is toast. Take a good look at the tranny bell, when the center bearing failed on my 97, it cracked the bell, resulting it a different tranny.
So if the flywheel is bad it can be replaced, like the bearings and stuff being bad but the bell being cracked will require a new tranny
Yes, replace the flywheel with a single mass unit. You can get the conversion kit for around 400 bucks. If the bell is cracked you can either replace the front 1/2 of the tranny case or a different tranny. The front case for a diesel is getting hard to find. The front case for a S42 will fit the S47 transmission. Just remember you need the diesel transmission, as they have their own bolt pattern. Some have said that you can redrill the 460 ZF5 to fit the 7.3 bolt pattern, but this would be the last resort for me.
well ill look into that, ill check it this coming weekend because i work 2nd shift all week and use the truck to get to work.
I was going to look into just swapping the good 7.3 to a gas truck of the same year, ive found like 3 so far for 1500 and supposedly really good condition with no rust. ill look into that flywheel asap though, because its the thing thats plauging it the most.
although getting a gas truck to do a swap with would probably be more optimal as mine is eat up with rust, and will be a job to repair myself.
Also would make it a auto truck, i hate autos, but i dont know about you all, but ive found 10 e40d 4x4's to one zf5 4x4's. so might be better in the long run i dont know, ill update probably after ive checked the flywheel out, if it turns out its bad ill replace with the single mass one like you were talking about.
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