Went drag racing - major break down - Chevelle Tech
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post #1 of 107 (permalink) Old Jun 1st, 19, 3:20 PM Thread Starter
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Chris
 
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Went drag racing - major break down

60ft's have always been a struggle in this car, so I put a 2 step it in. Set to a mild 2700 rpm and held with about 70% throttle, I released the clutch and BANG.

While the ring gear sheering all the teeth off is one thing, how the hell do I spin the driveshaft too? The diff destruction should have relieved all the energy. A Denny's 3.5" DS that they said could easily hold 750 hp, but it didn't hold my 370 rwhp.




1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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Last edited by davewho1; Jun 2nd, 19 at 2:51 AM. Reason: title sp.
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post #2 of 107 (permalink) Old Jun 1st, 19, 3:52 PM
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Quote:
Originally Posted by -SS454- View Post
60ft's have always been a struggle in this car, so I put a 2 step it in. Set to a mild 2700 rpm and held with about 70% throttle, I released the clutch and BANG.

While the ring gear sheering all the teeth off is one thing, how the hell do I spin the driveshaft too? The diff destruction should have relieved all the energy. A Denny's 3.5" DS that they said could easily hold 750 hp, but it didn't hold my 370 rwhp.



Ouch I am sorry to see and hear about that....and that terrifies me. I wonder if it's due to your clutch having absolutely no slip to it.
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post #3 of 107 (permalink) Old Jun 1st, 19, 3:57 PM
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Re: Went drag racing - major brake down

Ouch.
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post #4 of 107 (permalink) Old Jun 1st, 19, 3:59 PM
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Re: Went drag racing - major brake down

No fun breaking stuff, but you must admit that is pretty cool carnage!

Will the driveshaft be warrantied?

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post #5 of 107 (permalink) Old Jun 1st, 19, 4:04 PM
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Re: Went drag racing - major brake down

I'm guessing when the diff gave it up, the loose stuff locked it up, giving the driveshaft all the torque with nowhere to send it.

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post #6 of 107 (permalink) Old Jun 1st, 19, 4:31 PM Thread Starter
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Re: Went drag racing - major brake down

Quote:
Originally Posted by pnugene View Post
I'm guessing when the diff gave it up, the loose stuff locked it up, giving the driveshaft all the torque with nowhere to send it.
I suppose it's possible, I'll have to watch the video to analyze a bit. But I do know for sure it broke instantly, and still rolled forward so I could steer it off the racing line.

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post #7 of 107 (permalink) Old Jun 1st, 19, 5:53 PM
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Re: Went drag racing - major brake down

What clutch?

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post #8 of 107 (permalink) Old Jun 1st, 19, 5:54 PM
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Quote:
Originally Posted by pnugene View Post
I'm guessing when the diff gave it up, the loose stuff locked it up, giving the driveshaft all the torque with nowhere to send it.
This^^^ I have one hanging on the wall twisted in half from my sons stick car rear end broke and twisted driveshaft in two.
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post #9 of 107 (permalink) Old Jun 1st, 19, 6:06 PM Thread Starter
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Re: Went drag racing - major brake down

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Originally Posted by aukai View Post
What clutch?
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post #10 of 107 (permalink) Old Jun 1st, 19, 6:06 PM Thread Starter
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Re: Went drag racing - major brake down

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Originally Posted by B433 View Post
This^^^ I have one hanging on the wall twisted in half from my sons stick car rear end broke and twisted driveshaft in two.
Did the rear end sheer the teeth like mine did?

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post #11 of 107 (permalink) Old Jun 1st, 19, 6:53 PM
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Re: Went drag racing - major brake down

Maybe time to call Moser for a rear. You don't know on yours after 50 years it may have some issues (some visable and others hidden). Today's aftermarket 12 bolts are beefier and with your stick shift you might want to consider it.
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post #12 of 107 (permalink) Old Jun 1st, 19, 7:41 PM Thread Starter
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Re: Went drag racing - major brake down

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Originally Posted by Lew540 View Post
Maybe time to call Moser for a rear. You don't know on yours after 50 years it may have some issues (some visable and others hidden). Today's aftermarket 12 bolts are beefier and with your stick shift you might want to consider it.
That is the plan. The problem is I would like to switch to coil-overs and I don't know if I can get them to fit around my 3" exhaust. Plus I want to mini-tub in the future and thus cant decide if I should go with a narrowed rear end or not.

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post #13 of 107 (permalink) Old Jun 1st, 19, 7:42 PM
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Re: Went drag racing - major brake down

if this is primarily a drag car put a pro gear in it. they are made with a different alloy designed for higher shock loading but they will wear out driving many miles on the street
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post #14 of 107 (permalink) Old Jun 1st, 19, 8:14 PM
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Did the rear end sheer the teeth like mine did?
Yes, but was a 8.8 ford
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post #15 of 107 (permalink) Old Jun 1st, 19, 8:19 PM
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Re: Went drag racing - major brake down

Quote:
Originally Posted by Lew540 View Post
Maybe time to call Moser for a rear. You don't know on yours after 50 years it may have some issues (some visable and others hidden). Today's aftermarket 12 bolts are beefier and with your stick shift you might want to consider it.
I have a Strange S60 Dana with an S-trac helical gear posi on it's way.

Complete assembly for a 67.

Looks like I may need it. Scary stuff
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