Hello, I don't post much but you guys seem to know your **** so here goes. I have a 65 f-100 with 302 and a c-4 trans, yesterday I was driving home on I-5 and I was hearing a very high pitch whining noise when I'm going around 55 mph then it would go away. Then I pulled off of the highway and when I started to accelerate their was a low pitch winding noise and it hasn't gone away. and the high pitch whine starts up around 55 and goes away at about 65 mph. their is no noise when its in park and I rev it up but nothing. I checked for a vacuum leak, nothing checked the rear diff. it was a little bit low so I filed it up and nothing, any ideas? thanks mat
fluid is good, how can I tell if the torque converter is bad? It has always slipped a little bit going into second at a low rate of speed but not at higher speeds but it is shifting just fine.
my high stall conv. whines like crazy. Im just waiting for it to go. Drive it till it breaks, then you know what to look for.
your best bet is to take it into a shop where they can raise the truck up on a lift and have someone in the cab run the truck with another guy under the truck with a mechanic's stethescope to pinpoint the wine. this will help you quickly pinpoint the noise and save you from costly unnecessary part changes.
Too much slop in the rear end? My Nova has a whine when I back off the throttle. At higher speeds it's not as noticable. It probably gets beyond my hearing range.
thats what I'm worried about, I'm out of work and can't afford to do a major repair or replace, I'm really hoping I can figure it out on the cheap or I'm screwed
Front pump in the trans..possibly try to pin point the area the sound is coming from..maybe another person in the car with you as you drive moving around inside to find the closest source to the noise.. than go from there I have used short pieces of broom handles, or short piece of conduit or 3/4" pvc pipe to hold to the area and up to my ear to get a pin point on the area of the sound, then you know where to start your investigative dis-***embly
If it is coming from the rear differential it will increase and decrease with speed and load applied. If it starts off low and then loudens or increases in pitch as you accelerate it may be the rear differential. If at cruising speed the noise increases or decreases as you feather the throttle it may be the rear differential. Best bet is to take an experienced mechanic for a quick spin and let him hear the noise to give you a better idea. Don't just start throwing parts at it trying to make it go away!
So I chocked my front wheels and jacked up the the rear end and had my girlfriend put it in drive and give it some gas, we couldn't hear the noise but I put a pipe to the rear diff. and it didn't sound too smooth inside of the pumpkin, I am ***uming that it should be a smooth sound, but I don't know. I also put the pipe against the transmission but that sounded smooth. If someone can tell me what the rear end should sound like that would give me some direction. thanks guys for your help
If it is an open rear "non posi" and only one wheel is spinning you may get excessive noise as the differential is working/doing it's thing. If both wheels were turning equally and there was excessive noise you may have found the problem. Did you check the fluid level while you were under there?
I checked the fluid yester day and it was a little low so I filled it to the bottom of the plug. as for the wheels spinning, both of them spun with the truck jacked up but about a year ago I got stuck in some mud and the only wheel spinning was the p***enger so I'm ***uming its non posi. Its a stock ford 9 inch so I doubt it would be "posi"
I say posi just so you know what I mean. A Ford would be Trac-lok or Equa-lok. If both wheels were spinning at equal speed you can rule out the spiders and side gears as the source of the excessive noise. It could still be carrier or pinion bearings even possibly an axle bearing but you should hear that further out towards the wheel.
I know what you meant by referring to posi, I just didn't know what ford called it. I think I'm going to have to wait till the weekend to open any thing up, I live in an apartment and they don't take kindly to me working on my truck thanks for your help
I don't know, it made a lower pitch noise at lower speeds and a high pitch noise at higher speeds, I don't think I could of got my girlfriend to rev it up that high, she was scared the truck was gonna fall and go speeding off.
If it is a limited slip rear you need to make sure and put the proper additive in the gear oil - you can get it at any good parts store.
Normal rear end noises are scarry. Lots of clunking and banging going on in there when no load is applied. It could still be your problem, but unless it's the same noise you hear driving, it ain't the rear.
how do I know if it is a limited slip rear end? I have looked for any id tags on it and couldn't find one, the only way I know its a 9 inch is from the vin tag, which I know its right because I'm only the 3rd owner and it was well do***ented from my dad and the old timer that he got it from...
Are we certain its the rearend whining? Ive ridden in a car or two where the speedometer cable will whine like hell..... it would change pitch as you drove too.
Sometimes the radio speakers pick up static... Did you mess with or replace the plug wires recently??.. I had some problems like that years ago...
Here's a link to an ID guide. http://www.fordification.com/tech/rearends_ford03.htm BTW it won't hurt a thing to drain and refill the rear - shouldn't cost you more than $20. If that's not the problem consider it routine maintenance - I wouldn't be surprised if it had the original oil still in the diff. Put the additive in first then top off with the proper oil.
Limited slip clutches do not make any noise when going straight ahead. The clutches only slip or shudder on turns where one wheel is turning faster than the other.
The Jalopy Journal
