924Board.org

[dubrict]

So I was driving along and suddenly the '79 NA stopped accelerating. Now when I put it in gear, I hear a metallic scraping sound and the car doesn't move in any gear. Note that the clutch has to be engaged in gear to hear the noise.

At first I thought the torque tube was spinning on the spline connecting it to the tranny, but now I'm thinking transfer case. Luckily, I have another disassembled snailshell sitting in the garage to harvest parts from.

Also I did something stupid. I lowered the tranny a bit before disconnecting the clamp holding the end of the torque tube. Now I need to miracle the tranny off the spline. Sure wish the access hole in the tube was bigger than a shrimp's joystick or I could just use a pickle fork
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[fiat22turbo]

Put the transaxle back in place and then pull the coupler.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[dubrict]

Nothing is working so far. It's like the transmission is welded to the driveshaft
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[ideola]

You need to put the trans back up fully on the mounts. If you can't do that, then you need to disconnect the four bolts at the front of the torque tube, and slide the entire assembly back until you can relieve the pressure that the weight of the trans is putting on the coupler. You might even need to lower the torsion carrier to do it. Sucks, but it has to be done. The coupler is hardened metal of some sort, and will be nearly impossible to cut, so don't even bother thinking about that. Get the weight off of it and it will slide.
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erstwhile owner of just about every 924 variant ever made

[dubrict]

I got it out. Problem was I was a complete moron and left one of the upper torque tube bolts in. Found the problem too, the coupler is broken. I know I didn't break it and it was the problem because the teeth inside of it are stripped on what was left, while the fragment that broke off still has teeth.

Luckily the splines are still good on the tranny and driveshaft.

Bad news is that coupler is outrageously expensive at $300+
Part #477521145A
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[ideola]

You shouldn't have too much trouble finding a used one...check with Grenadiers or Eturbo924.
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erstwhile owner of just about every 924 variant ever made

[dubrict]

Will the coupler from a 931 work? I have access to that
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[fiat22turbo]

Nope, different spline count. Sorry.

Has to be a 924 NA with the snailshell box, not the Audi.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[ideola]

[dubrict]

perhaps I'll swap in the tranny and torque tube from the 931. Probably need the shift linkage too, anything else I should know about?

[edit] nevermind found it in the tech section. I'll need the clutch and crossmember as well. No big deal, really. Now just to make sure I'm reading this right, the clutch from an '83 mustang works when my donor trans/tube is a '81 931?
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[ideola]

As noted above, the 931 has a larger (25mm) driveshaft and input shaft. If you do this, you will need to find a clutch disc that has the correct size. Don't quote me on this, but I think I've read that the Bronco II clutch disc will work in an NA and has the correct diameter and spline count.

But if you do the swap, you're going to need the trans, the coupler, the torque tube, and the entire shifting assembly all the way up to the shift lever. You will have to remove the rear torsion carrier in order to replace the torque tube.
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erstwhile owner of just about every 924 variant ever made

[dubrict]

According to autozone's specs on the porsche and bronco discs, they are both 8 7/8" outer diameter, but the inside spline diameter is off by 1/32"
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1979 924 NA
2009 Chevy Impala
2005 Dodge Dakota

[ideola]

The Bronco II disc has been used by multiple members here with no issue on 931s. The thing I'm not sure about is the diameter of the 924 NA pressure plate. The 8&7/8" diameter is 225mm ... I think the NA is only 215mm, but not positive on that.
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erstwhile owner of just about every 924 variant ever made

[tyfighter123]

The bronco II disc wont work because the pressure plate on the n/a is 215 mm like Dan said. So if you want to switch the torque tube and the transmission you will need to get a 1993 mustang 2.2l 5 speed disc. The disc has the larger inner spline with 23 teeth on it to fit the larger (25mm) drive shaft, while the outer diameter is 8.5 inches (215mm) to fit within the pressure plate of the n/a.

http://www.924board.org/viewtopic.php?t=9091&postdays=0&postorder=asc&start=15
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

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