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chris4x4
Dodge Dakota
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10/19/2005
21:30:27

Subject: RE: performance gain from 3.55 to 4.10
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"That's because you also switched to bigger tires. If you stay w/ smaller tires and switch to 4.10 ratio, then engine makes more turns for each yard you travel. Bigger tires compensate for this."
Actually, I had the 32's before I swapped the gears.



GraphiteDak
GenIII
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10/19/2005
21:38:48

RE: performance gain from 3.55 to 4.10
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I heard one guy on here run 4.56's and run STICK 29" tires and he LOVED the performance.

The reason I'm thinking of 4.56's is that I am most likely getting a 20 ft toy hauler here really quick.

I want the GEARS to do the work! And I figure if the 4.56 drive me a LITTLE nuts on the highway at 80MPH I can go from the 29" tires to 31 or 32's next tire change and be about where 4.10's would be now :)




My truck does NOT drive me to work. I drive it to the store after work a few times a week, and out of town trips, off roading, and some towing.

I will be towing close to 8,000 Lbs. 4.10's would help. I am trying to make up my mind about 4.56's.



DSW
Dodge Dakota
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10/19/2005
21:58:11

RE: performance gain from 3.55 to 4.10
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So has anyone seen a torque curve for a 4.7? Just qurious what RPM range the engine puts out peak torque. I had an 00 CC 4.7 auto and now have a 03 QC 4.7 auto, both with 3.55 gears. There's a difference in the auto tranny's OD since the 00 cruised at 80MPH with the engine at about 2650 RPM and the 03 cruises at 2300 RPM doing 80MPH.

The 00 seemed like it had bigger b@lls than 03, maybe just the tuning of the engine, but it would be nice to drop in some 4.10's and still turn the same RPM as the 00. Oh the 00 had better mileage then my 03,,, maybe it's the gearing?

I am thinking the 00 had the tranny/gear combo smack dab in the middle of the engine's torque curve whereas the 03 has it on the bottom side.



Kowalski
GenIII
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10/20/2005
09:03:45

RE: performance gain from 3.55 to 4.10
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GraphiteDak - are you sure your stock tires are only 29" ? The 16" tires I see on the newer 4x4s look like about the same size as my stock 31s, but I've never measured anyones 16s. 31s don't measure an honest 31", don't think I'd personally want to run anything less than 33s with 4.56. My revs seem just a little busy with the 4.10 and 31x10.5x15, but not bad.

DSW - torque peak for 4.7 is around 3400 on the factory graph - I think you're on the right track here; but I don't think 00' is right in the middle of the torque curve - just closer to it than the 03' combo. Going to 4.10 gears seems to put us even closer to the range where engine is making the best torque to fuel ratio, which I think would be largely why some of us have seen better milage with 4.10s. This could well be part of the reason your 00' got better milage, but there is a weight difference between the CC and QC too.

Lead, follow, or get out of the way

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