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Old 07-07-2009, 12:25 PM   #1
craigIS
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Exclamation rear diff problem...

well i just bought my car last wek, and i just started haveing trouble with the rear differential. i hear this knocking sound sometimes when i shift, and sometimes in gear randomly. when im driving donw the road in gear, the diff will knock, and throw the car to the the side.

i looked at the car before i bought it, and didnt notice anything such as leaking diff fluid. so i looked under the car yesterday when this started to happen, and where i parked the car, there is a small puddle of diff fluid on the ground.

is there any quick fix for this? or, am i effed, and need a new diff.

also if i wanted to put some fluid into the diff, how would i do that?

thanks in advance.
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Old 07-07-2009, 06:15 PM   #2
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Hopefully its not the same problem that I was having, when my diff began knocking like that during gear changes and sometimes not during gear changes like on hills and what not, it was my rear subframe that had gone through.
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Old 07-07-2009, 06:58 PM   #3
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Jack the rear up on jack stands and remove the backing plate to the diff make sure you block the front wheels. Put the car in in neutral and slowly spin the wheels and looks for anything unusual or loose. Start the car and put it in first and slowly let the clutch out and have someone watch or listen while you accelerate a "little" you don't want to throw the car off the stands if by chance you're too jerky.

Or you can take it to a shop with a hoist and have the throw it in the air to check out.

good luck.
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Old 07-07-2009, 09:11 PM   #4
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well, my car just stopped driving, it just sounds like loud ass grinding kinda. it does it in every gear, just does not move.

actually i can put it into reverse it it will reverse half ass.

im still wondering what the issue could be, CV axel, or the diff.....
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Old 07-07-2009, 09:43 PM   #5
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well, my car just stopped driving, it just sounds like loud ass grinding kinda. it does it in every gear, just does not move.

actually i can put it into reverse it it will reverse half ass.

im still wondering what the issue could be, CV axel, or the diff.....
Its very easy to tell; jack the car up, remove wheels (for more visibility), start the car and put in gear. Now look at what spins; if driveshaft spins, but none of the axles move, then problem is in the diff. If output flanges move (and possibly the axle itself) but wheels dont, it can be CV (or stripped hub).

In any case, its not a big deal, few hours of work in the worst case...I also have all the parts you can need!
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Old 07-07-2009, 09:47 PM   #6
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[quote=crossfire291;1322153]well i just bought my car last wek, and i just started haveing trouble with the rear differential. i hear this knocking sound sometimes when i shift, and sometimes in gear randomly. when im driving donw the road in gear, the diff will knock, and throw the car to the the side.

The diff can NOT throw the car to the side! In no way is it supposed to move at all...You might have problems with rusty subframe mounts etc...
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Old 07-08-2009, 05:49 PM   #7
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a bad ujoint will also cause clunking when shifting..
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Old 07-08-2009, 07:31 PM   #8
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this is beginning to sound more and more like my problem, once the knocking got worst it then led to loud grinding which was the driveshaft jsut rubbing on the subframe of the car, but my car still moved however, but very very slowly
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Old 07-08-2009, 09:09 PM   #9
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i havent had time to get the car up on jacks today, so that will be the plan tomorrow. from what i can see, every thin that is visible looks fine, there is not obvious damage, and the rust under the car is just surface, and not rotting. ill update tomorrow.
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Old 07-09-2009, 07:37 PM   #10
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well, i got the car on jacks today. the CV Axle on the driver side is kinda wiggles around you pull on it, while the passenger side does not.

the drive shaft turns while the car is in gear. there is no grinding sound at all while the car is in the air. also both tires also turn while on jacks, but the driver side, you can stop buy gabbing and holding the wheel. the passenger side does not do that.

basically im thinking the CV rod is pooched, or its the diff.....what do you think?
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Old 07-09-2009, 10:45 PM   #11
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well, i got the car on jacks today. the CV Axle on the driver side is kinda wiggles around you pull on it, while the passenger side does not.

the drive shaft turns while the car is in gear. there is no grinding sound at all while the car is in the air. also both tires also turn while on jacks, but the driver side, you can stop buy gabbing and holding the wheel. the passenger side does not do that.

basically im thinking the CV rod is pooched, or its the diff.....what do you think?
I would say the hub is stripped, the axle should be tight in the hub...thats why its wiggling and you can stop the wheel...When the wheel is stopped, look at the alxe, does it still spin...or does it also stop?
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Old 07-09-2009, 11:11 PM   #12
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The CV joints and the axle itself would snap before the hub would strip. It's just a blown CV joint, no need to continue agonizing over it. Buy a new or find a used halfshaft and get on it (or go ask your favorite mechanic for a quote).
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Old 07-09-2009, 11:48 PM   #13
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The CV joints and the axle itself would snap before the hub would strip. It's just a blown CV joint, no need to continue agonizing over it. Buy a new or find a used halfshaft and get on it (or go ask your favorite mechanic for a quote).
I have seen it happen twice...in both cases the axle would spin inside the hub. One of the times the axle nut was loose and the splines stripped...
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Old 07-10-2009, 05:00 AM   #14
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Bearing? Or the diff its self has gone BYE BYE!
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Old 07-10-2009, 07:59 AM   #15
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I have seen it happen twice...in both cases the axle would spin inside the hub. One of the times the axle nut was loose and the splines stripped...
Wow, well I'll take your word for it but that's crazy. Did the axle pull out partially?
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