vibration driving me nuts
Thread Starter
|
Laughing Gas
Joined: Nov 1999
Posts: 954
Likes: 2
From: 15 miles west of Venus
vibration driving me nuts
I developed a driveline vibration when I installed a set of new 4.11 gears in my '55. The 9" diff is originally out of a'70 F100. This is the first rearend I have set up. I have what feels like a loose yoke or bad u joint feel that starts about 60 mph and really gets noticable above 70 mph.
Things I know it is not:
driveshaft or u-joints (replaced)
rear bearing in tranny (Tremec TKO)
pinion/tranny angle
rear yoke
engine or tranny mounts
I can pull the axles and it is still there.
The rearend setup well and backlash was to spec. Tension was put on the carrier bearings to Ford manual spec. Yoke torqued to spec. (kit had solid "crush sleeve" with shims) Pattern looked good. There was no glitter in the the oil sample I looked at after about 2k miles. There is no up and down or in and out pinion movement detectable with a dial indicator.
The pinion bearings fit a lot tighter on the pinion than the factory ones. I measured the old crush sleeve and used the solid one and shims to match. Pinion rotating torque looked good although I did not have a torque wrench that would go down low enough in inch pounds.
Things I know it is not:
driveshaft or u-joints (replaced)
rear bearing in tranny (Tremec TKO)
pinion/tranny angle
rear yoke
engine or tranny mounts
I can pull the axles and it is still there.
The rearend setup well and backlash was to spec. Tension was put on the carrier bearings to Ford manual spec. Yoke torqued to spec. (kit had solid "crush sleeve" with shims) Pattern looked good. There was no glitter in the the oil sample I looked at after about 2k miles. There is no up and down or in and out pinion movement detectable with a dial indicator.
The pinion bearings fit a lot tighter on the pinion than the factory ones. I measured the old crush sleeve and used the solid one and shims to match. Pinion rotating torque looked good although I did not have a torque wrench that would go down low enough in inch pounds.
Posting Guru
Joined: Feb 2002
Posts: 1,003
Likes: 0
I think you may have already stated your problem - "I developed a driveline vibration" Even though you have a new shaft and joints I think you still have a problem here. Either the new shaft needs to be rebalanced, something is mounted off center or maybe a u-joint is bound up. The other thing to maybe watch for because it has a large arm, or length from center of rotation, are the balance and mounting of the rear tires. I wonder if a dial indicator would help determine problems with the drive shaft?
Posting Guru
Joined: Feb 2002
Posts: 1,003
Likes: 0
P.S. How about some pictures of your '78 project...
'78 F250 4x4 Supercab Camper Special. Cummins 6BTA, NV4500, South Bend clutch, NP205, Dana 70/60. Project
Sounds very interesting. I am trying to convert my 400 C6 NP205 to a Ranger torque splitter - NP435 - married twin stick NP205 with HD Dana 44 front and 60 back both with selectable lockers (not sure which ones yet). My progress is slow and money based but still moving along...
'78 F250 4x4 Supercab Camper Special. Cummins 6BTA, NV4500, South Bend clutch, NP205, Dana 70/60. Project
Sounds very interesting. I am trying to convert my 400 C6 NP205 to a Ranger torque splitter - NP435 - married twin stick NP205 with HD Dana 44 front and 60 back both with selectable lockers (not sure which ones yet). My progress is slow and money based but still moving along...
Thread Starter
|
Laughing Gas
Joined: Nov 1999
Posts: 954
Likes: 2
From: 15 miles west of Venus
The old driveshaft had a bit of bow in it and was replaced with a new d/s built by a reputable local company. Both u joints were replaced during the search to find the vibration. Every problem I have addressed has reduced the vibration slightly, but has not fixed the main problem.
The vibration is there without the axles installed.
Will try to get some pictures in the gallery.
The vibration is there without the axles installed.
Will try to get some pictures in the gallery.
Cargo Master
Joined: Oct 2003
Posts: 2,833
Likes: 4
From: Jefferson, Iowa
Trending Topics
New User
Joined: Jun 2003
Posts: 8
Likes: 0
I am having the same problem with my 95 4x4. had rear gears changed to lower set. Broke them in as directed, and now at 55 to 70 mph i get this terrible vibration in the drive line somewhere. But I also can't seem to be able to put enough transmission fluid in it to keep it full. I have a leak now that I didn't have before the new gears?? Any suggestions on what could have caused this, or what it is?
The truck is sitting at the place the gears were changed, and will be talking with them tomorrow. Hopefully they will fix the problem that they have created!!!
The truck is sitting at the place the gears were changed, and will be talking with them tomorrow. Hopefully they will fix the problem that they have created!!!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer