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  #21  
Old 08-11-2013, 04:55 PM
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Quote:
Originally Posted by mdavis501 View Post
I found the drive ratio chart posted by mdragon9 to be very useful; however, I do not agree with the comment that "A hemi with the 8 speed and 3.21 should feel snappier overall than a hemi with the 6 speed and 3.55." The example given, and shown to be accurate from the chart, "at 1500 RPM, you should be going about 68 MPH with the 8 speed/3.21 and about 61 MPH with the 6 speed/3.55 combo." This is true, however, that is at 8th gear / 6th gear.

I guess it all depends on what "feel snappier" means, but I would evaluate that as how does it feel going thru the gears. The chart shows that at 1500 rpm the 3.21 ratio 8 speed would have you going at 9.74 mph at end of 1st gear compared to 13.82 mph for the 6 speed 3.55 truck (also at end of first gear). To me, that would feel "snappier" as I would be going faster thru first gear with the 3.55 truck than the 3.21 truck (regardless of the 8 vs 6 speed).

Do you read the chart that way, too?
I'm sure you'll find this read interesting Mdavis.
http://www.ramforumz.com/showthread.php?t=143891
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  #22  
Old 08-12-2013, 01:33 AM
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You're misinterpreting the chart. Sure the 8-speed will only be at 9.74 MPH at the end of 1st gear but it will get to 9.74 MPH quicker than the 6-speed will. It will then shift to 2nd gear so quickly that you can barely feel it. The revs will only drop a couple hundred as it continues to rev though 2nd gear. This keeps the engine more in the best power band. Since the overall gear ratio is shorter, the engine will rev quicker. I'm too brain dead right now to try and explain it any better so probably the best way to find out is test drive both.
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  #23  
Old 01-20-2015, 01:21 PM
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OK...help me understand the OP's attachment. If I am comparing the 3.21 to the 3.92, both with 8 speed (let's assume 5.7 Hemi in both as well), it appears to me that the 3.21 is quicker up to about 90 MPH at all RPM's...correct? or am I reading it wrong?

3.21 quicker than 3.92 just does not sound right?
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  #24  
Old 01-21-2015, 04:32 AM
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Quote:
Originally Posted by Sportznut View Post
OK...help me understand the OP's attachment. If I am comparing the 3.21 to the 3.92, both with 8 speed (let's assume 5.7 Hemi in both as well), it appears to me that the 3.21 is quicker up to about 90 MPH at all RPM's...correct? or am I reading it wrong?

3.21 quicker than 3.92 just does not sound right?
The 3:21 will spin the wheels at a higher RPM than the 3:92s given the same transmission output shaft speed. The OP's attachment doesn't reference time so how long it takes, or quicker, isn't realized on the chart. It is simply comparing the tire rotation speed versus the transmission output shaft speed with respect to each axle ratio.
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  #25  
Old 01-21-2015, 05:54 AM
earlzach earlzach is offline
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Don't use the word "quicker" use the word "faster"

A 3.21 will be traveling faster than the 3.92 at every RPM.
As long as apple to apples.

The 3.92 is Quicker for a moment then runs out on revs while the 3.21 is still running up the speed.


And fellows, this is not a fact from a race it is a hypothetical. But truth all the same in reality.
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  #26  
Old 01-21-2015, 08:55 AM
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Ok..thanks guys. I think I get it now.
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