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Old 11-08-2013, 03:38 PM
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Tightening the transmission tailshaft 30mm nut

I'm getting to the point where I'll be reinstalling the driveshaft on my 300SD. In tightening the tailshaft nut (long story why it was off in the first place), I tightened it to the point where the transmission was tipping over despite my best efforts to step on it. I think the torque wrench MAY have clicked, but I'm not sure. What do you guys think? Should I just bolt it up? It's very tight, bu I'm wondering what the "tight enough" threshold is.

The thing is on a splined shaft, so I can't imagine anything too horrendous happening if the nut does come loose. What do you guys think? I probably will put at most 5000 miles on this before I swap in a standard anyway...

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Old 11-08-2013, 03:55 PM
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Answer

Here is my concern.

***********************************************
This issue is becoming more common.
Bad 722.xxx-transmission output flange spinning on shaft

Transmission Problem & Fix

Output flange, 722.xxx transmission

***************************************

.
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Old 11-08-2013, 04:27 PM
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Why not re-torque it when you have it installed in the car? You'll have it bolted to the engine and that should hold it so your can properly torque it down. Or maybe I am confused on where you've got everything lol

I didn't have any trouble tightening that nut on my 722.418 under the car. That was 30k ago.

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82 300SD 145k
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