Moser 12 bolt with stock auto steel driveshaft: U joint question, strength question.

[Hilton]

Today I tried to put a stock driveshaft in my new Moser 12 bolt. The U joint will ALMOST fit into the yolk (yoke?). Is there another U joint that's about a mm smaller?

Second question: I've heard that the stock steel driveshafts that came out of certain auto cars are stronger than the Aluminum driveshafts that come in our cars. Is this true? I hope so, because I happen to have one.

Thanks in advance,
Hilton

[Hilton]

I searched and searched, and the answer I came up with, was the Precision 372.

It appears that THIS u joint is too small. I wish I'd realized that before installing it. The driveshaft slides back and forth a lot. My grease gun is empty, so I haven't filled it through the fitting. I guess it's possible that the addition of the grease will prevent it from sliding back and forth quite so much.

Have a look, tell me what you think. These pictures are with the driveshaft pushed all the way to the other side. The gap would be halved were the driveshaft centered.

[Exotic Performance Plus]

If the Moser 12 bolt has a 1350 yoke, and you are using the stock driveshaft, you will need a 447 U Joint.

The U Joint you have in the above pictures is the wrong one.

All the stock driveshafts are fairly weak. Your best bet would be to upgrade to a stronger aftermarket driveshaft that has a 1350/1350 U Joint. Bob

[Johnny-LT1-runner]

Considering that both the aluminum and steel driveshafts had u joints that were originally mated to factory 10 bolts, you would need to get a properly matched u joint no matter which DS you used, since the Moser yoke is a different size.

[Blown383LS1]

NAPA part #447 is what you need.

[Hilton]

Thanks. That's what I'm going to put in this evening.

[Johnny-LT1-runner]

Awesome, now you can finally get those tires on the ground! lol