94 ATX tranny kaput - what went wrong?

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DirtSHO

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The other day I was out visiting my cousins about 40 mins away from where I live. Trip up was no problem and the car was behaving quite normally. Spent a few hours there then decided to head on back home. Started the car and everything still normal. Drove normal for about 20 mins thru red light traffic on the main blvd. Now I'm waiting, idling at a red light. Light turns green. I take my foot off the brake, hit the gas in a normal not-too-brisk take off when all of a sudden I hear a SNAP! (or your average something breaking sound). Car comes coasting to a stop. I get it over to the side in N and put it in P. Try to get moving again trying all the gears. At first, in the forward drive gears I can't get moving at all and the tranny is making sort of a free spinning buzzsaw sound. I have reverse for about a few feet before that starts making the same sound. I turn the car off and pray it was something frooty like some low fluid and I can limp it back. Check the fluid and it's fine, but add a tiny bit more just in case. Still nothing.

Finally get it towed home and try it the next day. Now the tranny is making an even worse buzzsaw sound - something more like a wood chipper. "Holy Balls!" I'm thinking to myself. Looks like it's gonna need work. I'm about call up the shop in the next few days after I gather up some loot to pay for it so my question is: any idea what went wrong/broke? I usually just like to have a ballpark idea of what needs to be fixed when I bring it to a shop. I try to work on things myself but I have no idea when it comes to transmissions. The guy I'm bringing it to is trustworthy and I've been to him before but I like to give him some sort of heads up.

Hopefully a little brief history can help you guys clear things up:
The car is a 94 ATX with about 119k miles on the clock and was my daily driver up until about a month ago. Very reliable (to me anyways).
According to the person I purchased it from the trans was rebuilt once before but there are no receipts and the date/mileage it was done is unknown.
I'm never really too ******* the car. About once a week I used to gun it rolling down a long stretch. About once or twice a month a brisk takeoff from a light.
Tranny fluid level checked about twice a month and always kept near full. Never really lost/burnt any fluid. However, when checking the dipstick it was really hard to determine accurate level because the blank side of the stick had a small bead of fluid running nearly 3/4ths of the way to the top, but the side with the markings had a distinquishable bead that read near full most of the time. Don't know if that's normal for the SHO because none of my other cars had that occur.
I noticed no real significant signs that something was about to go. No significantly odd noises or behaviors coming from the tranny prior to the SHOboom. Once in a blue moon there'd be a hanging shift (maybe 3 times in 4 years), after which I would always check fluid and top off if need be.

Nothing else I can think of at the moment. So again what do I need? Entire rebuild? Something small? Could it be a differential or something else qweer? Thanks in advance for the help.
 

SHObill

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sounds like an oil pump shaft. typical. If so they can be replaced without pulling the trans out.
SSPX0118.jpg
 

DirtSHO

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It might actually be that simple for once? Whew! OK I'll look that up and ask him to check it out. Thanks.

Any other suggestions?
 

SHObill

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--but the REAL cause of this is because you left her for another! No longer a DD & she felt un-loved. Thats when she is most vulnerable to the SHO gremlins who can wreak havoc!
...LOL...:evilgrin:
 

Bizzy

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I've never heard what a bad pump shaft sounds like. Do ATX halfshafts ever break? That's what came to my mind at first, though I'm sure it could be other things as well.
 

DirtSHO

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LOL, yeah I guess "SHOniqua" was feeling a bit ignored, and decided to throw a fit. I thought she'd understand that I was only looking out in her best interests.

Well it's kinda hard to describe the sound. The only thing I could really compare it to was that of a grinding power table saw cutting thru a log. That's what it sounds like now. At the time it actually broke, it was more of a winding sound, but that didn't last very long. Oh, and the sound only occurs in any of the drive gears (RD21) and not Neutral or Park. The engine idles and revs normally in any of the gears, it's just the wheels don't move (reverse worked for about a few yards at first then ballzed out). The car moves and steers normally when pushed with the engine both started and off (although of course there's no power steering when off).

What normally causes a halfshaft to break? How hard is it to do if that's the case?

I'll try to get a clip of the sound if possible during the day.
 

Bizzy

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Well, hard shifting can cause them to break, that's why it's more common for MTX halfshafts to break, but I don't think that it would be impossible for an ATX shaft to break, especially if it's an original shaft. I guess it just depends on your driving style.

Did you take a look underneath at all to see what you could see or hear? You might be able to get a closer estimate on where the noise is originating from if you do.

Just for the record, I'm not saying that it's not the pump shaft, I've never heard one that's bad before so I have no way of knowing what it sounds like so Bill is probably correct.
 

yzstud

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Well, hard shifting can cause them to break, that's why it's more common for MTX halfshafts to break, but I don't think that it would be impossible for an ATX shaft to break, especially if it's an original shaft. I guess it just depends on your driving style.

Did you take a look underneath at all to see what you could see or hear? You might be able to get a closer estimate on where the noise is originating from if you do.

Just for the record, I'm not saying that it's not the pump shaft, I've never heard one that's bad before so I have no way of knowing what it sounds like so Bill is probably correct.

Never.....:nut:


really? never you say?
i had one snap off going 65mph down the highway in my 94 euro lumina
 

DirtSHO

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Hmm... OK well the trans has never had any hard or jerky shifts as long as I've owned it. Occasionally I'd have a tire-barking takeoff from a stop to SHO-off, but very rarely. None of that ever seemed to adversely affect anything.

I have looked under the car, but not properly. Basically, I've just bent down to take a peek if anything was leaking or hanging loose from the curb/street, but haven't been on my back under it with a flashlight. From what I could see by that view, there's no external signs of anything. I have a jack and some stands in my storage garage so I can try to take a better look for you guys in the next few days once I push the car someplace convenient (I can only move it a few spaces at a time cause my rowhouse block is ballz crowded). I'll get vids of the sound from a bottom angle as well as the top too. It sounds horrible - like some part is getting ground to smithereens. Loudest tranny sound I've heard of all my broke ones.

I'm definitely gonna save her no matter what, but I'd like to get an idea of how much the surgery is gonna hit me for in the pocket before she goes under the knife. It's the damn Equalizer - I bet it's gonna be a penny less than what my tax return check is for. I can't get ahead.
 

hawkeye18

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really? never you say?
i had one snap off going 65mph down the highway in my 94 euro lumina

Dude. Have you seen the size of the CV shafts on a lumina? They're about as thick as a #2B Dixon-Ticonderoga.

I've never seen an ATX SHO snap an axle before, although the way I've got mine shifting, I wouldn't be surprised if I was the first.
 

Bizzy

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I haven't either under normal circumstances, though I have heard of them breaking when the joints finally go.
 

n8rsk8r

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well what about the chain?

My first guess was a half shaft also. This noise you speak of could be that or a sprag took a dump.. but I dunno if what you said it sounded like whining and now like a chainsaw... :shrug: could be whipping around in there. Maybe the planets.. just can't really tell by description of sound alone man. Just build her really stout if that is what is needed!
 

DirtSHO

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Alright I'll bring that to his attention also. Still gonna try and get a better look and clips, but unfortunately it's been raining all day and looks like it will be lasting well into the dark. Still open to other ideas. Hopefully I'll learn enough basic stuff to know what I'm talking about when it comes to trannys at the least. What does the chain do, whereabouts is it, and what could cause one to break? Thanks again.
 

bubba

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It sounds like mine did! I broke a "hard part" cost me an arm and a leg. My wife got tried of seeing it and sent it to a trans place. I was sad at the bill I got.
 

Reboticon

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This is exactly what my car sounds like. It keeps throwing the passenger axle out of the tranny. Did you locate the source of your problem?
 

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