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Old 01-10-2017, 05:06 PM
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Driveshaft issue

Well. Me and my dad were driving my car into the garage to finish putting the exhaust underneath. He got a wild hair and powerbraked the car. All was looking pretty sick until pow! Shut the engine down. Peaked underneath my car and my driveshaft was in two pieces. It's a pretty wild 385 stroker that I put in a 84 Monte Carlo. Th350 tranny with a stick shaft and rear ended. My question is there anything that could've went wrong to twist it in two? Ie transmission or u joints? I want to believe it was caused from shear power but I don't think so. Has anyone experienced this before?
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Old 01-10-2017, 05:25 PM
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Probably broke the u-joint first, but I wouldn't be surprised if it was the tube.

The G-body cars have just about the weakest driveshaft of all RWD GM cars...the Chevette may be the only thing weaker. The stock G-body shaft is basically just muffler tubing, it is the same type of EWS (Electric Welded Seam) tube and only .062" thick.

The Buick Grand National and Regal T-Type, and the Hurst Olds are the only G-bodys that got a better shaft from the factory.

You're best bet is to get a custom shaft made. Myself and friends have always used Denny's Driveshaft in New York and have never seen one of his shafts broken. Strange, Precision Shaft Technologies, DynoTech Engineering and Inland Empire are some other good companies.

Dennys Driveshaft and Driveline Parts High Speed High RPM Balanced Steel and Aluminum Drive Shaft Specialist
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Old 01-10-2017, 05:52 PM
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Denny's on the east coast, Inland Empire on the west coast.
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Old 01-11-2017, 06:49 AM
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Agree on the inherent weak tubing that was the weak link in the chain. I have a local shop build my 'shafts. All new components, Spicer or Neapco and a 3.5" tube.


The last one ran me $300 and I had it in 2 days. My opinion, I always try to keep the local shops busy with my work.
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Old 01-11-2017, 12:49 PM
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Nicks and scratches in the tube from rocks and curbs and road debris make the tube even more weak.
Although DS seems to twist and then break that one looks like to have failed from a stress point.
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Old 01-11-2017, 12:51 PM
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It looks like my last relationship
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Old 01-13-2017, 12:55 PM
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I've seen more robust toilet paper tubes.
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Old 01-13-2017, 01:07 PM
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Quote:
Originally Posted by Dep905 View Post
Well. Me and my dad were driving my car into the garage to finish putting the exhaust underneath. He got a wild hair and powerbraked the car. All was looking pretty sick until pow! Shut the engine down. Peaked underneath my car and my driveshaft was in two pieces. It's a pretty wild 385 stroker that I put in a 84 Monte Carlo. Th350 tranny with a stick shaft and rear ended. My question is there anything that could've went wrong to twist it in two? Ie transmission or u joints? I want to believe it was caused from shear power but I don't think so. Has anyone experienced this before?

This s why many race associations require driveshaft loops to keep the shaft from dropping to the pavement and keep it contained from flying through the spectators in the stands if it busts. If this is the stock shaft you can be sure that GM wasn't thinking of power breaking an 84 Monty with a 385 when they wrote the spec's.


Bogie
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Old 01-13-2017, 01:15 PM
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maybe the 7.5" rearend imploded, if not then that's next..
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Old 01-13-2017, 01:16 PM
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Currently looking at 9 inch rearends lol. I was going to ride it until it broke. Which was 3...2...1...
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