vibration at 40mph
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vibration at 40mph
Okay, my truck has always pulled to the right, so over the weekend I replaced both U-joints (irrelevent, but done), both front calipers, pads and wheel bearings. I also machined the front hubs to fit Dodge 1500 wheels. I took the truck out and now the truck shakes at about 40 mph but before and after that it's fine. I don't know if U-joints could cause this or not. Is there a way to out the driveshaft back in wrong and cause it to be off balance? Either way, the truck still pulls to the right and the left caliper is the one that is REALLY tight. What would cause this type of vibration, and what else could cause the pulling?
BTW, sorry for the long post, but I couldn't find the search button.
BTW, sorry for the long post, but I couldn't find the search button.
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This won't help you but every Ford truck I've ever owned has pulled to the right! As for the shake how are the tie rod ends?.Also if you changed wheels did you change tires also? A slightly out-of-round tire really affects the front end of IFS Fords especially lifted with bigger tires. (assuming you have an IFS Ford truck. ) Cheers
007BRONCO
007BRONCO
Last edited by 007bronco; Oct 14, 2004 at 03:17 AM.
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When I first got my "Oldie But Goodie" F150 4x4 I too had a simular problem.
I went and got the tires alighned and Balanced, This fixed that problem right up. You should have seen the size differance in the tire balance weights that they put on to fix it.
I went and got the tires alighned and Balanced, This fixed that problem right up. You should have seen the size differance in the tire balance weights that they put on to fix it.
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you say that you machined down your hubs to accept the dodge wheels.... did you put them on a lathe or did you hit them with a grinder...
you could have put your rotor/hub assembly's out of round...
I would also check your tie rod ends..
grab the ole lady... (girlfriend,wife, buddie ,,, what ever..) and have them slightly turn the steering wheel from side to side while you lay on th ground just in front of the truck..
if your tie rods are bad you can see excessive movement in the boots..
mind you your doing this with the truck OFF.... you just want to apply pressure to the parts..
hope this helps...
you could have put your rotor/hub assembly's out of round...
I would also check your tie rod ends..
grab the ole lady... (girlfriend,wife, buddie ,,, what ever..) and have them slightly turn the steering wheel from side to side while you lay on th ground just in front of the truck..
if your tie rods are bad you can see excessive movement in the boots..
mind you your doing this with the truck OFF.... you just want to apply pressure to the parts..
hope this helps...
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Well, I have the twin I-beam front end, so I can rule out that issue. The wheels are BFG All Terrain T/A (285/75r16) on 16" dodge wheels. I swapped tires around and came to the conclusion that it is the left hub. I did machine it on a lathe, but I think it was slightly off-center. I'm going to go back and remachine the hub tommorow and see what happens. As for the pulling issue, I was told that bad radius arm bushings can cause pulling to one side, and mine are shot. Any opinions on this? I was thinking about replacing them with poly bushings from broncograveyard.com.
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Vibration problem might be caused by the driveshaft being installed 180 degrees out as stated by an earlier post.
Pulling to the right can be caused by bad alignment, sticking caliper, or having two mis-matched tires on the front. The latter was the case on my 86 F-150. Someone who owned the truck before me had put one type of tire with a max. inflation pressure of 44 PSI on one side and a different tire with a max inflation pressure of 35 PSI on the other. It pulled to the side that had the 35 PSI tire. I swapped the tire from one side to the other and the pull switched from one side to the other. Just some food for thought.
Pulling to the right can be caused by bad alignment, sticking caliper, or having two mis-matched tires on the front. The latter was the case on my 86 F-150. Someone who owned the truck before me had put one type of tire with a max. inflation pressure of 44 PSI on one side and a different tire with a max inflation pressure of 35 PSI on the other. It pulled to the side that had the 35 PSI tire. I swapped the tire from one side to the other and the pull switched from one side to the other. Just some food for thought.
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Sorry, didn't catch the IFS thing the first time. I remachined the hub and it's still doing it. Now I'm wondering if the tires need to be balanced. I'm going to try rotating the tires. Also, when you say 180 off on the driveshaft, do you mean the front is in the back, or what?
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From: GANS
Originally Posted by JoeDaddy15
Sorry, didn't catch the IFS thing the first time. I remachined the hub and it's still doing it. Now I'm wondering if the tires need to be balanced. I'm going to try rotating the tires. Also, when you say 180 off on the driveshaft, do you mean the front is in the back, or what?
he means the weight on the driveshaft might be on the wrong side.. (ie unhook the yoke crank the shaft 180 degrees, and bolt it back up
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Agree,
Vibration at a certain speed that goes away at other speeds implies that it has to be a rotating part that varies with speed such as drive train, wheels etc.
Vibration at certain RPMs would be a rotating part on engine/accessories.
Constant vibration would be suspension
Drive shaft is either 180 out or hubs were turned wrong
Good Luck,
Lee
Vibration at a certain speed that goes away at other speeds implies that it has to be a rotating part that varies with speed such as drive train, wheels etc.
Vibration at certain RPMs would be a rotating part on engine/accessories.
Constant vibration would be suspension
Drive shaft is either 180 out or hubs were turned wrong
Good Luck,
Lee
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From: British Columbia
Is it a vibration or a shake? It seems we're not all on the same page. My F-150 4X4 had a horrible shake at about 40 mph usually set off by a small bump, I could look out the window and see the left front tire moving fwd and back rapidly and the shake was so bad people would stare and point. Long story short, I put "round and balanced" tires on, new tie rod ends, and a steering stabilizer and it never did it again. Every IFS (TTB) ford I've owned since (4-6" lift 33-36" tires) almost felt like they wanted to do it too. If it's a vibration, I agree about the shaft(s) 180 out. Disconnect one end ,rotate, reconnect. Also try your rear tires on the front, see if it still does it. One more thing, you can also try mounting your front wheels 180 degrees on the rotor from where they are now to maybe cancel out rotor/wheel imbalance. (actually it would be 140-some degrees with a five bolt but you get the picture.)
Good luck
007BRONCO
Good luck
007BRONCO
Last edited by 007bronco; Oct 16, 2004 at 12:39 AM.
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I don't think I've heard whether it's been isolated to front or rear. The steering wheel will shake if it's front. The passenger side seatback will bounce around if it's rear.
I've got some suggestions if it were a constant shake, but we've ruled that out.
It's only at 40.
I've got some suggestions if it were a constant shake, but we've ruled that out.
It's only at 40.
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Well, I found the problem after removing and installing wheels and rotors more times than I care to think about. I jacked the rear of the truck and let the wheels get up to 40 mph to see if the driveshaft was the problem. It turned out to be one of the tires being out of round. I got so ****ed I put all the stock wheels back on and went to work, and now EVERYTHING works right. No vibration, no pull, nothing. Now my last question to you fine people is, do I have to replace the tire, or can it be fixed by balancing? Thanks again to all who helped me out.