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Old 06-15-2010, 11:36 PM   #18
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Is the increase in pinion speed with 4.11's enough to worry about oil cooling the differential? What would the rpm's be at 80 mph in 6th with 4.11's? I had a 4.56 spare pumpkin made for my 73 corvette and had 4.56's in my 68 Camaro, and it definitely made highway cruising more of a "buzz", but the stoplight to stoplight giddiup was way more fun!
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Old 06-17-2010, 06:22 AM   #19
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What would the rpm's be at 80 mph in 6th with 4.11's?!
Low 2000s. At 70-75 its right at 2000 rpm with the Richmond 4.10s.
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Old 06-20-2010, 11:51 AM   #20
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Here are some quick numbers for those interested in side by side comparison.




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Last edited by ZooDad; 06-20-2010 at 12:40 PM. Reason: Added 6L80 and 3.90 Ratio
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Old 06-20-2010, 12:45 PM   #21
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I contacted Motive and they said they have a 3.91 and 4.10 in the works which should be available in the fall but haven't decided on prices yet.
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Old 06-20-2010, 06:39 PM   #22
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I contacted Motive and they said they have a 3.91 and 4.10 in the works which should be available in the fall but haven't decided on prices yet.
We are all over the new Motive stuff and will have that along with the Richmond gears that we currently stock as soon as they are available.

Last edited by Apex Motorsports; 06-20-2010 at 07:39 PM.
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Old 06-20-2010, 06:55 PM   #23
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very interested in this.
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Old 06-21-2010, 12:17 AM   #24
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So should we wait for 3.91 gears to come out if we have the automatic? Which is better in your opinion 3.73 or 3.91? Thanks!
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Old 06-21-2010, 06:09 AM   #25
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So should we wait for 3.91 gears to come out if we have the automatic? Which is better in your opinion 3.73 or 3.91? Thanks!
I would go with 3.73s. The automatic transmission is already geared pretty aggressively and 3.91 will probably be too much for most people.
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Old 06-21-2010, 08:27 AM   #26
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We have the 373s in stock!!
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Old 06-21-2010, 07:40 PM   #27
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Here are some quick numbers for those interested in side by side comparison.




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Very nice chart. This should help a lot of peoples out.
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