rear end noise
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From: La Grande, OR
rear end noise
well i went wheelin yesterday and really screwed something up I think. I thought it was the front end and maybe clutch, but after today and hanging my head out the window, its coming from the back.
It doesnt happen much going straight, but on a highway corner, it starts squeaking. I have a 1987 F150 with a 8.8" 3.55LS rear end, so did I fry the clutches in the LS?
It doesnt happen much going straight, but on a highway corner, it starts squeaking. I have a 1987 F150 with a 8.8" 3.55LS rear end, so did I fry the clutches in the LS?
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From: Davis & Newcastle, CA
If you're noticing it around turns more than going straight then my first guess would definitely be the clutches in the LS gears. Take the puppy apart and have a look. Report what you find.
-Chris
-Chris
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From: La Grande, OR
any idea what to specifically look for? havent really done axles before.....
and if they are bad, is it ok to still drive with them? i.e. will they destroy the bearings or ring/pinion? I want to put in a locker, but dont have the simoleons for it yet.
and if they are bad, is it ok to still drive with them? i.e. will they destroy the bearings or ring/pinion? I want to put in a locker, but dont have the simoleons for it yet.
Last edited by nighthawk285; Mar 19, 2007 at 04:13 AM.
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From: Davis & Newcastle, CA
Negative, sorry. I too have not done rear end work yet (still learning). Only reason I know about the clutches and how they are supposed to behave (or misbehave in this case) is from paying close attention to other guys' posts. Hopefully someone else can chime in here about what to look for.
-Chris
-Chris
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Usually if you fry the clutches in the LS they just slip and you get the one wheel burnout. They tend to chatter if they are hanging up or grabbing too much on turns--like if you didn't put in the friction modifier. Go to a parking lot and drive in several left hand and then right hand circles and see if the noise goes away. If not, change the rear end fluid and see if that helps. While you have the cover off, inspect the internal components.
You should put the rear up on jack stands, pull the cover, rotate the diff and look at the side gears and ring and pinion gear to make sure nothing is wrong. Have you looked to make sure all your suspension components are still intact? Whenever I've broken rearend parts it generally was a popping/banging type of noise.
There's not a whole lot of magic inside the rearend that you won't be able to figure out. If you're setting one up for the first time then you should have experienced help. Here is an exploded diagram of a Sterling 10-1/4" LSD so you have a general idea of what's in there:
You should put the rear up on jack stands, pull the cover, rotate the diff and look at the side gears and ring and pinion gear to make sure nothing is wrong. Have you looked to make sure all your suspension components are still intact? Whenever I've broken rearend parts it generally was a popping/banging type of noise.
There's not a whole lot of magic inside the rearend that you won't be able to figure out. If you're setting one up for the first time then you should have experienced help. Here is an exploded diagram of a Sterling 10-1/4" LSD so you have a general idea of what's in there:
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From: La Grande, OR
Going in circles in a parking lot (at about 15-20mph) doesnt show anything, but on a cloverleaf on the highway or a sharp corner that I have any kind of speed going around makes that sound, so would that rule out the LS? It doesnt do it when drifting around corners either.
I crawled under and wiggled the driveline to check u-joints pretty hard, and got the truck moving, and I can get it to squeak, which I've traced down to the lower shock bushing on the drivers side....would this be doing it?
I crawled under and wiggled the driveline to check u-joints pretty hard, and got the truck moving, and I can get it to squeak, which I've traced down to the lower shock bushing on the drivers side....would this be doing it?
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From: Davis & Newcastle, CA
Originally Posted by nighthawk285
Going in circles in a parking lot (at about 15-20mph) doesnt show anything, but on a cloverleaf on the highway or a sharp corner that I have any kind of speed going around makes that sound, so would that rule out the LS? It doesnt do it when drifting around corners either.
I crawled under and wiggled the driveline to check u-joints pretty hard, and got the truck moving, and I can get it to squeak, which I've traced down to the lower shock bushing on the drivers side....would this be doing it?
I crawled under and wiggled the driveline to check u-joints pretty hard, and got the truck moving, and I can get it to squeak, which I've traced down to the lower shock bushing on the drivers side....would this be doing it?
-No noise when making tight/moderately slow turns in parking lot
-YES noise when making right hand turns around cloverleaf exits of freeways
-No noise when drifting around turns
Now my questions. Does it only make the noise when turning right?? How about a comparable LEFT turn? You also mentioned that you think the noiuse is coming from your lower driver-side shock bushing. Is this the rear bushing? Is the squeak more of a squeak-squeak-squeak-squeak or a SQQQUUUUEEEEEAAAAKKKKKKKK?? Lastly, what is the condition of the bushing in question? Deteriorated, nearly shot, cracked, newish??
The fact that it is squeaking around turns indicates to me that it is related to the weight of the truck shifting around, which might mean your bushing theory is correct. Try to get it to squeak going around a left turn.
-Chris
-Chris
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From: La Grande, OR
You do understand the situation
It seems to only do it turning right yes, but I can't find a left turn big enough around here to get it to do it....unless I go backwards up the cloverleaf
It is a squeak-squeak-squeak, which makes me wonder if theres something in the brake or something.
The bushing is pretty bad, as I think that these are the original shocks on this truck.
It seems to only do it turning right yes, but I can't find a left turn big enough around here to get it to do it....unless I go backwards up the cloverleaf
It is a squeak-squeak-squeak, which makes me wonder if theres something in the brake or something.
The bushing is pretty bad, as I think that these are the original shocks on this truck.
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From: La Grande, OR
well I found the squeak, it turned out to be a rock in the back brake drum..... but it masked another problem I guess.
under the same conditions, now it makes a hollow clangy metal-on-metal noise. I can't find any wear marks anywhere....could this be from an internally broken shock? Same thing with the right turns, and the harder I turn, the more intense the clang-clang-clang.....Also it does it when theres a little bit of axle hop...it rained last night and I was curious if I could peel it out or not, and when it started hopping it made the same noise.
under the same conditions, now it makes a hollow clangy metal-on-metal noise. I can't find any wear marks anywhere....could this be from an internally broken shock? Same thing with the right turns, and the harder I turn, the more intense the clang-clang-clang.....Also it does it when theres a little bit of axle hop...it rained last night and I was curious if I could peel it out or not, and when it started hopping it made the same noise.
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From: La Grande, OR
like I asked before.....any idea what to look for? I need to take this Thursday to go home for spring break, so any preliminary ideas would really help.....As it is, I will pull the cover and at least change the oil, but I can't really get into anything, and I don't really know what to look at other than spiders and ring/pinion.
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From: La Grande, OR
well im not an axle expert, but theres something jammed in one of the spider gears, ill try to get a picture, then see if i can get it up on jackstands and rotate it out of there
edit....heres the picture, I havent rotated it because it looks fused in there....its the only thing that seems to look abnormal in there, but that piece had to come from somewhere
edit....heres the picture, I havent rotated it because it looks fused in there....its the only thing that seems to look abnormal in there, but that piece had to come from somewhere
Last edited by nighthawk285; Mar 20, 2007 at 04:12 PM.
