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Old 06-26-2006, 01:06 AM   #1
99/02SC2Kid
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Default Diff Pin

That damn Diff pin came out, but if anyone can tell me where to get a new transaxle housing please help.

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Old 06-26-2006, 01:58 AM   #2
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Default Re: Diff Pin

transaxles are cheap at the junkyard. I think they go for like $40 round here

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Old 06-26-2006, 06:55 AM   #3
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Default Re: Diff Pin

What ^^^^^ he said. I wouldn't stop with the housing.

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Old 06-26-2006, 07:08 AM   #4
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Default Re: Diff Pin

What causes a diff pin to come out?! Also if one comes out, does that kill the tranny?!

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Old 06-26-2006, 07:27 AM   #5
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Default Re: Diff Pin

Quote:
Originally Posted by SaturnManiac
What causes a diff pin to come out?! Also if one comes out, does that kill the tranny?!
Hmmm must be you're not the maniac we were thinking you are... lol
Generally it blows a hole in the housing, which also allows all the fuild to leak out. It probably takes out other stuff as well and it sounds like it's just easier to replace the entire thing.
Oh, get it welded before putting the next one in.
It comes out most often by doing burnouts where one tire spins a lot faster then the other one, theres a night vid of it somewhere 'round here, you can hear it breaking.

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Old 06-26-2006, 07:38 AM   #6
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Default Re: Diff Pin

Quote:
Originally Posted by fetchitfido
Hmmm must be you're not the maniac we were thinking you are... lol
Generally it blows a hole in the housing, which also allows all the fuild to leak out. It probably takes out other stuff as well and it sounds like it's just easier to replace the entire thing.
Oh, get it welded before putting the next one in.
It comes out most often by doing burnouts where one tire spins a lot faster then the other one, theres a night vid of it somewhere 'round here, you can hear it breaking.

Crap, I'd hate for that to happen with my Saturn. I thought these cars were supposed to be safe and get your money's worth and all that other good stuff. But regular driving don't cause this, I guess street racing and all that crap?!

I don't know everything about Saturns, I want to learn everything about them, LOL.....that's why I ask 100 questions.

Saturns are good cars, just seems like some of the stuff I read makes them almost like GM's "experimental" car.

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Old 06-26-2006, 09:47 AM   #7
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Default Re: Diff Pin

Don't spin your wheels or prepare to have a broken tranny.


http://www.hardcars.com/headerman/saturntranny.mpg

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Old 06-26-2006, 10:52 AM   #8
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Default Re: Diff Pin

Quote:
Originally Posted by amazinghl
Don't spin your wheels or prepare to have a broken tranny.
Yeah it dosn't seem to matter if it's an auto or manual either, although it's much more commen fo it to go on a manual...
I don't think I've heard of it comeing out with out the tires having been spun or major heavy abuse.
That said, I do believe a lot of auto-crossers don't weld the diff pin and have no problems with it.

I knew the vid was somewhere.

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Old 06-26-2006, 11:43 AM   #9
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Default Re: Diff Pin

Quote:
Originally Posted by fetchitfido
Yeah it dosn't seem to matter if it's an auto or manual either, although it's much more commen fo it to go on a manual...
I don't think I've heard of it comeing out with out the tires having been spun or major heavy abuse.
That said, I do believe a lot of auto-crossers don't weld the diff pin and have no problems with it.

I knew the vid was somewhere.
Traction control is also a major prevention device against diff pin failure. If you can't do a burnout, you're relatively safe (I'm sure some idiots can still find a way to break it).

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Old 06-27-2006, 08:14 PM   #10
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Default Re: Diff Pin

i think i just lost mine no noise really nothing just going down the street and saw some smoke got home to see the fuild leaking out cant see from where anythink else it could be

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Old 06-27-2006, 09:48 PM   #11
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Default Re: Diff Pin

I have seen posts from those that know that say it can come out under normal usage, but it's pretty uncommon.

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Old 06-27-2006, 11:57 PM   #12
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Default Re: Diff Pin

I still don't understand why a burnout would cause the pin to go. The diff pin doesn't know the difference between driving straight ahead at 120 mph and moving at 20 mph with the wheel spinning at 50 mph. The centrifugal force on it is the same. I've never heard of a pin throwing at high speed. I think there must be more to it. I'd bet it has something to do with the spider gears jamming or failing, and taking out the pin.

By the way, Joker, if you were driving home in your car, the diff pin isn't the problem. It would completely grind to a sudden halt, and you would hear noises that would make you wet your pants...

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Old 06-28-2006, 06:21 AM   #13
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Default Re: Diff Pin

Quote:
Originally Posted by DukeCitySC2
I still don't understand why a burnout would cause the pin to go. The diff pin doesn't know the difference between driving straight ahead at 120 mph and moving at 20 mph with the wheel spinning at 50 mph. The centrifugal force on it is the same. I've never heard of a pin throwing at high speed. I think there must be more to it. I'd bet it has something to do with the spider gears jamming or failing, and taking out the pin.

By the way, Joker, if you were driving home in your car, the diff pin isn't the problem. It would completely grind to a sudden halt, and you would hear noises that would make you wet your pants...
That would be true if both wheels were turning at the same rate. However, when doing a burnout, both wheels rarely turn at the same rate. It is the difference between the rate the left wheel is turning and the right wheel is turning that encourages the diff pin to come out. This happens when you are going around turns too that's why you have a differential. However, when turning you aren't putting near the strain on the transmission you are when doing a burn out.

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Old 06-28-2006, 02:05 PM   #14
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Default Re: Diff Pin

Quote:
Originally Posted by BarnOwl
That would be true if both wheels were turning at the same rate. However, when doing a burnout, both wheels rarely turn at the same rate. It is the difference between the rate the left wheel is turning and the right wheel is turning that encourages the diff pin to come out. This happens when you are going around turns too that's why you have a differential. However, when turning you aren't putting near the strain on the transmission you are when doing a burn out.
I understand that, but the forces on the diff pin when the wheels are turning at different rates would not act to force the pin longitudinally, in fact they are negligible. The spider gears have equal forces on each side.

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Old 06-28-2006, 02:09 PM   #15
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Default Re: Diff Pin

Quote:
Originally Posted by BarnOwl
I have seen posts from those that know that say it can come out under normal usage, but it's pretty uncommon.
That claim is very suspicious coming from anyone that is in their teens or twenties.

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Old 06-28-2006, 02:47 PM   #16
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Default Re: Diff Pin

Quote:
Originally Posted by DukeCitySC2
I still don't understand why a burnout would cause the pin to go. The diff pin doesn't know the difference between driving straight ahead at 120 mph and moving at 20 mph with the wheel spinning at 50 mph. The centrifugal force on it is the same. I've never heard of a pin throwing at high speed. I think there must be more to it. I'd bet it has something to do with the spider gears jamming or failing, and taking out the pin.

By the way, Joker, if you were driving home in your car, the diff pin isn't the problem. It would completely grind to a sudden halt, and you would hear noises that would make you wet your pants...
IT isn't so much the burnout that throws the diff pin, it's the sudden gain of traction at the end. Happens a lot here in ny when someone gets stuck in the snow, roasts the tires to get out of it, then when they hit pavement the tires suddenly gain traction....no more diff pin.
Also, there are times when you will be able to drive a car with a thrown diff pin. It doesn't always come all the way out and it doesn't always come right through the case. I've repaired some where the pin is onlyu partially out and just barely hitting the case, but enough to cause a fissure and for the fluid to leak out quickly.
Trans replacement isn't necessarily the best route. When you can get a pick n pull tranny for $40, it certainly is, however when we repair them in the shop we replace the case half and the differential and use the other internals from the tranny. Fairly simple repair actually, and MUCH less than a factory reman.

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Old 06-28-2006, 04:32 PM   #17
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Default Re: Diff Pin

Quote:
Originally Posted by DukeCitySC2
I understand that, but the forces on the diff pin when the wheels are turning at different rates would not act to force the pin longitudinally, in fact they are negligible. The spider gears have equal forces on each side.
Yeah, but there's not much holding it in to begin with.

Quote:
Originally Posted by GreenSC2
That claim is very suspicious coming from anyone that is in their teens or twenties.
If Wolfman says it can happen, I'm not gonna argue with him. If my 17 year old nephew says it did, I'll argue with him.

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Old 06-29-2006, 10:48 AM   #18
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Default Re: Diff Pin

The diff pin is retained in the differential housing by a rool pin. Abuse of the transaxle (which includes burnouts, or habitual shifting from forward to reverse gears with the car moving in the opposite direction) cause the dif pin to gradually hammer away at the retaining roll pin until it shears. At that point, basically NOTHING is holding the diff pin itself in place and centrifugal force eventually does the rest. (Propels the diff pin out of the housing with gradual or spectacular results depending on the circumstances the car is being operated in when it happens.

NOTE: Even if YOU NEVER have done this, you bought the car USED and have no way of knowing for SURE how it was treated by the previous owner or owners.

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Old 06-29-2006, 11:15 AM   #19
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Default Re: Diff Pin

Quote:
Originally Posted by wolfman
...or habitual shifting from forward to reverse gears with the car moving in the opposite direction)...
crap.
I suppose it still effects it if the car is moving under 5mph, right?

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Old 06-29-2006, 11:35 PM   #20
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Default Re: Diff Pin

Quote:
Originally Posted by fetchitfido
crap.
I suppose it still effects it if the car is moving under 5mph, right?
The potential cumulative effects are basically the same. It just will take a longer or shorter time frame to reach the same end result depending on the factors involved.

(Sort of like trying to drive a nail with a hammer....you can do it quickly with a couple or even one good wack! Or slowly, with a whole lot of short little ones.)

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