bad vibration..
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Freshman User
Joined: Feb 2003
Posts: 29
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From: green bay
bad vibration..
o.k. heres my new problem..it seems like every time i put my truck in 4th and get around 55-65 mph that is starts to vibrate really bad..BUT if i push my clutch in while it's vibrating it will stop..sometimes i have to do it a few times and sometimes it seems to help if i give the engine a little rev..so far the rearend was checked new u joints for front and rear driveshafts..took it to a machine shop and had the driveshaft balanced and new plastic slider things put on it and also a new front yoke..the tires are new and balanced and the reason i know it's not the tires is that i've had 3 diff..sets on in the past couple of months..so i am at a total loss as what to try next..it feels like the clutch is out of balance or something but i didnt think it could do that cuz of the input shaft it rides on..the transmission was just rebuilt also.
someone please help me out on this.. it will be greatly appreciated..i am about () that close to selling my truck ..i cant afford to keep putting money into it like i have...i want to keep it..and i will as long as i can..
thanks in advance..
mike
someone please help me out on this.. it will be greatly appreciated..i am about () that close to selling my truck ..i cant afford to keep putting money into it like i have...i want to keep it..and i will as long as i can..thanks in advance..
mike
Posting Guru
Joined: May 2002
Posts: 1,300
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From: Southwestern Michigan
bad vibration..
Thats a tough one...... I would check the engine and trans mounts. Also you say the trans was rebuilt... Are the bellhousing to engine,and bellhousing to trans bolts tight?
Thread Starter
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Freshman User
Joined: Feb 2003
Posts: 29
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From: green bay
bad vibration..
yea i triple checked all bolts to everything down there and it's all tight..could it be that something is out of line..my truck is lifted 4 inches..and also the guy who had the truck made it a manual..it was originally an automatic??? i dont know ..you dont have anymore ideas as to what it might be?? i would appreciate and ideas or opinions..
thanks alot though
mike
..you dont have anymore ideas as to what it might be?? i would appreciate and ideas or opinions..thanks alot though
mike
Posting Guru
Joined: May 2002
Posts: 1,300
Likes: 0
From: Southwestern Michigan
bad vibration..
You may have a problem with the pinion angle, When a truck is lifted the angle of the driveshaft to the pinion increases and can cause vibration and premature u-joint failure.
What is your truck exactly? long wheelbase or short or what?
Has the engine been replaced? have the mounts been fabricated? if so maybe the engine is crooked in there.
What is your truck exactly? long wheelbase or short or what?
Has the engine been replaced? have the mounts been fabricated? if so maybe the engine is crooked in there.
Thread Starter
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Freshman User
Joined: Feb 2003
Posts: 29
Likes: 0
From: green bay
bad vibration..
i have a 1979 ford F250 4x4..it's a longbox single cab..i thought the wheelbase was 133 but i could be way off..yes the engine has been replaced..it came with a 351..it now has a 400..as for the mounts,they look original..when i got the truck i noticed that the passenger side motor mount on the back side there were no nuts and bolts..and on the driver side on the back you can see he torched about an inch off the top of the mount..i dont know why he would do that..but hopefully this helps you out so you can help me..
please let me know if you have anymore ideas..
thanks alot for your help so far..
mike
please let me know if you have anymore ideas..
thanks alot for your help so far..
mike
