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Old 11-24-2012, 05:31 PM   #1
stangeatter
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input on ds concerns please?

I've had my car since new, its got 91000 on it now, I push 500 to the wheels on spray and have never had a ds issue. i was given an aluminum ds without rear attach and have not decided to install yet as mine has been great. I've just recently gone to 3.91 gears and am alittle concerned now about full on carnage. Can I get some opinions? I've run a best of 11.2 on drag radials. The only issues I've had, is I've sheared the bolts that hold my bolt together gforce 1320 stubs. That happened recently and I've just ordered another set of bolts from them.
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Old 11-25-2012, 01:52 PM   #2
Gforce1320
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Originally Posted by stangeatter...View Post
I've had my car since new, its got 91000 on it now, I push 500 to the wheels on spray and have never had a ds issue. i was given an aluminum ds without rear attach and have not decided to install yet as mine has been great. I've just recently gone to 3.91 gears and am alittle concerned now about full on carnage. Can I get some opinions? I've run a best of 11.2 on drag radials. The only issues I've had, is I've sheared the bolts that hold my bolt together gforce 1320 stubs. That happened recently and I've just ordered another set of bolts from them.

We can supply the bolt driveshaft adapter if you need one.
I wouldn't be concerned about running 11's on a 3.5" shaft no matter who's it is.
As far as the bolt together stubs, I would recommend sending the stubs in so we can make sure they get bolted together correctly. Not saying you cant do it but the threads have to be absolutely clean for the loctite to set up correctly and they have to be tightened to at least 60 ft lbs.
I'd also like to inspect them to see why they backed out if I could.
Bolt together stubs have been 9.20's with low 1.3x 60ft times and are a proven design.

Give us a call if you have any questions.

Thanks
Chris

Last edited by Gforce1320; 11-25-2012 at 01:58 PM.
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Old 11-26-2012, 06:04 PM   #3
stangeatter
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Thanks Chris. I have them out now. I will call tomorrow and we can sort it out. Thanks
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Old 11-26-2012, 06:23 PM   #4
Gforce1320
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Thanks Chris. I have them out now. I will call tomorrow and we can sort it out. Thanks

Sounds good. We can hook you up with that driveshaft adapter as well.

Thanks
Chris
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Old 11-28-2012, 03:58 PM   #5
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sounds bueno, I sent an email, from ricky.blackmon@l-3com.com. I tried calling too. no joy there.
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Old 11-28-2012, 04:12 PM   #6
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think of your tires as a fuse for torque. When the fuse blows, you break traction and the tires spin. Swapping in 3.91 gears effectively makes it easier for the same amount of torque from the engine to break traction and blow our fuse. The gears are after the DS, so their torque multiplication occurs AFTER the torque has gone through the DS, meaning the only parts that are stressed harder now are parts after the diff (stubs, axles, tires, hence breaking traction easier).

Since the same torque through the DS breaks traction sooner, effectively lowering the "rating" of our fuse, it enables the fuse to blow easier, making it even less likely to break something due to too much current (or torque).

Basically, the 3.91's will make your stock DS less likely to break, not more likely. The exception is if your new gears now create wheelhop, as that is akin to your fuse blowing, being replaced, then blowing, many many times in a short period. The repeated torque loading and unloading as the wheels grip and spin and grip can break stuff, especially if it happens at a resonant frequency and the hops get worse with each successive one.

Keep the stock DS, keep the spare in case the stocker breaks. You're already pushing it pretty hard. I just wanted to clarify the effects of gearing on driveline stresses for you, as you didn't seem too concerned previously
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Old 11-28-2012, 04:15 PM   #7
Gforce1320
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Originally Posted by stangeatter...View Post
sounds bueno, I sent an email, from ricky.blackmon@l-3com.com. I tried calling too. no joy there.

Sorry about that. Email replied to.
I'm packing up and getting ready to leave for PRI early in the morning and it's been a mad house around here today.
Casey my sales manager will get you taken care of.

Thanks
Chris
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Old 12-01-2012, 07:31 AM   #8
stangeatter
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Originally Posted by HunterKiller89...View Post
think of your tires as a fuse for torque. When the fuse blows, you break traction and the tires spin. Swapping in 3.91 gears effectively makes it easier for the same amount of torque from the engine to break traction and blow our fuse. The gears are after the DS, so their torque multiplication occurs AFTER the torque has gone through the DS, meaning the only parts that are stressed harder now are parts after the diff (stubs, axles, tires, hence breaking traction easier).

Since the same torque through the DS breaks traction sooner, effectively lowering the "rating" of our fuse, it enables the fuse to blow easier, making it even less likely to break something due to too much current (or torque).

Basically, the 3.91's will make your stock DS less likely to break, not more likely. The exception is if your new gears now create wheelhop, as that is akin to your fuse blowing, being replaced, then blowing, many many times in a short period. The repeated torque loading and unloading as the wheels grip and spin and grip can break stuff, especially if it happens at a resonant frequency and the hops get worse with each successive one.

Keep the stock DS, keep the spare in case the stocker breaks. You're already pushing it pretty hard. I just wanted to clarify the effects of gearing on driveline stresses for you, as you didn't seem too concerned previously


Thanks alot. Great info!
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