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Need advice on differential...

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Old Dec 11, 2010 | 07:01 PM
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Default Need advice on differential...

I recently had a RXT Mcleod clutch put in my 2000 ECS'ed corvette replacing a single disc monster clutch, Lets just say the RXT doesn't play games. When I finally had a chance to test it, after launching it a few times, on a 1-2 shift and I got wheel hop for 2 seconds and BOOM! I completely destroyed my differential. The car won't move and makes a loud clunk noise, I put it on my lift and saw that the whole case is cracked. (pics)

So I am assuming that I need a new one. I believe it had 4.10 gears. (first gear topped out at about 35 mph, it would just spin tires in 1st and 2nd) I was wondering what is the best gearing for my set up (about 515 rwhp) and is the 3 rib the way to go? How can I prevent this from happening again? (I have a brace and all)







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Old Dec 11, 2010 | 07:07 PM
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Some think a brace can contribute to cracking.
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Old Dec 11, 2010 | 07:10 PM
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for 515 rwhp, I would suggest 3.73 gears. Most will say stick with 3.42s but I like my 3.73 gears. they are a good balance between street and strip.
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Old Dec 11, 2010 | 07:33 PM
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Boom for sure!

I think the best gearing depends on what you want to do with the car. 1/4 mile, stoplight to stoplight, highway pulls?

What tires were you running blowing off 1st and 2nd?
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Old Dec 11, 2010 | 07:50 PM
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Originally Posted by tail_lights
Boom for sure!

I think the best gearing depends on what you want to do with the car. 1/4 mile, stoplight to stoplight, highway pulls?

What tires were you running blowing off 1st and 2nd?
Nitto Invos 305s and highway pulls are a big thing (toping out at 160 isnt all that great for the power it had...) but I also want the acceleration (Damn WRX STI's) but not a burnout machine...

Also I plan on forging the internals and running more boost soon so more power than it has should be considered, but that is then and this is now I guess...
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Old Dec 11, 2010 | 09:22 PM
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3.42
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Old Dec 12, 2010 | 02:39 PM
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Originally Posted by corvette8189
3.42
With that much hp and tq why do you want to play with just spinning the tires for. That crap doesnt get the car down the track or road at all. That will get you a loss, are you will get to buy new tire more. Plus if you are driving the car in town the 342 is a excellent gear for the best mpg.
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Old Dec 12, 2010 | 04:12 PM
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342 is a great gear for a boosted car.
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Old Dec 12, 2010 | 05:30 PM
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I would vote 3.42s as well. If you can hook 1st and 2nd with them you'll be accelerating quicker (obviously) down low and then that gearing will give you a little more leg up top (at least 'til 150)

I liked the 3.42s when I was making 507, and I still like them with 708, although hooking them is an issue now with my street tires. Drag radials going on soon!
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Old Dec 12, 2010 | 05:55 PM
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being that u got a stick I would stay with 4.11 or 390 I have a 1000 rwhp and I got a 3.73 gear
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Old Dec 12, 2010 | 08:30 PM
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Thanks to everyone, 3.42s it is. Anyone know the top speed with 3.42s? 3 rib worth it? chances of this happening again?
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Old Dec 12, 2010 | 09:07 PM
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Originally Posted by rzmnco
chances of this happening again?
100% if you let it wheel hop.
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